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/* Copyright (c) 2000, 2012, Oracle and/or its affiliates.
   Copyright (c) 2008, 2011, Monty Program Ab
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; version 2 of the License.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
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/**
  @addtogroup Replication
  @{

  @file

  @brief Code to run the io thread and the sql thread on the
  replication slave.
*/

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#include "sql_priv.h"
#include "my_global.h"
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#include "slave.h"
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#include "sql_parse.h"                         // execute_init_command
#include "sql_table.h"                         // mysql_rm_table
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#include "rpl_mi.h"
#include "rpl_rli.h"
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#include "sql_repl.h"
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#include "rpl_filter.h"
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#include "repl_failsafe.h"
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#include "transaction.h"
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#include <thr_alarm.h>
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#include <my_dir.h>
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#include <sql_common.h>
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#include <errmsg.h>
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#include <mysqld_error.h>
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#include <mysys_err.h>
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#include "rpl_handler.h"
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#include <signal.h>
#include <mysql.h>
#include <myisam.h>

#include "sql_base.h"                           // close_thread_tables
#include "tztime.h"                             // struct Time_zone
#include "log_event.h"                          // Rotate_log_event,
                                                // Create_file_log_event,
                                                // Format_description_log_event
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#ifdef HAVE_REPLICATION

#include "rpl_tblmap.h"
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#include "debug_sync.h"
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#define FLAGSTR(V,F) ((V)&(F)?#F" ":"")
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#define MAX_SLAVE_RETRY_PAUSE 5
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/*
  a parameter of sql_slave_killed() to defer the killed status
*/
#define SLAVE_WAIT_GROUP_DONE 60
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bool use_slave_mask = 0;
MY_BITMAP slave_error_mask;
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char slave_skip_error_names[SHOW_VAR_FUNC_BUFF_SIZE];
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char* slave_load_tmpdir = 0;
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Master_info *active_mi= 0;
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Master_info_index *master_info_index;
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my_bool replicate_same_server_id;
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ulonglong relay_log_space_limit = 0;
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LEX_STRING default_master_connection_name= { (char*) "", 0 };
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/*
  When slave thread exits, we need to remember the temporary tables so we
  can re-use them on slave start.

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  TODO: move the vars below under Master_info
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*/
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int disconnect_slave_event_count = 0, abort_slave_event_count = 0;
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static pthread_key(Master_info*, RPL_MASTER_INFO);

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enum enum_slave_reconnect_actions
{
  SLAVE_RECON_ACT_REG= 0,
  SLAVE_RECON_ACT_DUMP= 1,
  SLAVE_RECON_ACT_EVENT= 2,
  SLAVE_RECON_ACT_MAX
};

enum enum_slave_reconnect_messages
{
  SLAVE_RECON_MSG_WAIT= 0,
  SLAVE_RECON_MSG_KILLED_WAITING= 1,
  SLAVE_RECON_MSG_AFTER= 2,
  SLAVE_RECON_MSG_FAILED= 3,
  SLAVE_RECON_MSG_COMMAND= 4,
  SLAVE_RECON_MSG_KILLED_AFTER= 5,
  SLAVE_RECON_MSG_MAX
};

static const char *reconnect_messages[SLAVE_RECON_ACT_MAX][SLAVE_RECON_MSG_MAX]=
{
  {
    "Waiting to reconnect after a failed registration on master",
    "Slave I/O thread killed while waitnig to reconnect after a failed \
registration on master",
    "Reconnecting after a failed registration on master",
    "failed registering on master, reconnecting to try again, \
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log '%s' at position %s",
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    "COM_REGISTER_SLAVE",
    "Slave I/O thread killed during or after reconnect"
  },
  {
    "Waiting to reconnect after a failed binlog dump request",
    "Slave I/O thread killed while retrying master dump",
    "Reconnecting after a failed binlog dump request",
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    "failed dump request, reconnecting to try again, log '%s' at position %s",
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    "COM_BINLOG_DUMP",
    "Slave I/O thread killed during or after reconnect"
  },
  {
    "Waiting to reconnect after a failed master event read",
    "Slave I/O thread killed while waiting to reconnect after a failed read",
    "Reconnecting after a failed master event read",
    "Slave I/O thread: Failed reading log event, reconnecting to retry, \
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log '%s' at position %s",
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    "",
    "Slave I/O thread killed during or after a reconnect done to recover from \
failed read"
  }
};
 

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typedef enum { SLAVE_THD_IO, SLAVE_THD_SQL} SLAVE_THD_TYPE;
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static int process_io_rotate(Master_info* mi, Rotate_log_event* rev);
static int process_io_create_file(Master_info* mi, Create_file_log_event* cev);
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static bool wait_for_relay_log_space(Relay_log_info* rli);
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static inline bool io_slave_killed(THD* thd,Master_info* mi);
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static inline bool sql_slave_killed(THD* thd,Relay_log_info* rli);
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static int init_slave_thread(THD* thd, Master_info *mi,
                             SLAVE_THD_TYPE thd_type);
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static void print_slave_skip_errors(void);
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static int safe_connect(THD* thd, MYSQL* mysql, Master_info* mi);
static int safe_reconnect(THD* thd, MYSQL* mysql, Master_info* mi,
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                          bool suppress_warnings);
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static int connect_to_master(THD* thd, MYSQL* mysql, Master_info* mi,
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                             bool reconnect, bool suppress_warnings);
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static Log_event* next_event(Relay_log_info* rli);
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static int queue_event(Master_info* mi,const char* buf,ulong event_len);
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static int terminate_slave_thread(THD *thd,
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                                  mysql_mutex_t *term_lock,
                                  mysql_cond_t *term_cond,
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                                  volatile uint *slave_running,
                                  bool skip_lock);
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static bool check_io_slave_killed(THD *thd, Master_info *mi, const char *info);
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static bool send_show_master_info_header(THD *thd, bool full,
                                         size_t gtid_pos_length);
static bool send_show_master_info_data(THD *thd, Master_info *mi, bool full,
                                       String *gtid_pos);
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/*
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  Find out which replications threads are running
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  SYNOPSIS
    init_thread_mask()
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    mask                Return value here
    mi                  master_info for slave
    inverse             If set, returns which threads are not running
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  IMPLEMENTATION
    Get a bit mask for which threads are running so that we can later restart
    these threads.

  RETURN
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    mask        If inverse == 0, running threads
                If inverse == 1, stopped threads
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*/

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void init_thread_mask(int* mask,Master_info* mi,bool inverse)
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{
  bool set_io = mi->slave_running, set_sql = mi->rli.slave_running;
  register int tmp_mask=0;
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  DBUG_ENTER("init_thread_mask");

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  if (set_io)
    tmp_mask |= SLAVE_IO;
  if (set_sql)
    tmp_mask |= SLAVE_SQL;
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  if (inverse)
    tmp_mask^= (SLAVE_IO | SLAVE_SQL);
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  *mask = tmp_mask;
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  DBUG_VOID_RETURN;
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}

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/*
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  lock_slave_threads()
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*/
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void lock_slave_threads(Master_info* mi)
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{
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  DBUG_ENTER("lock_slave_threads");

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  //TODO: see if we can do this without dual mutex
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  mysql_mutex_lock(&mi->run_lock);
  mysql_mutex_lock(&mi->rli.run_lock);
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  DBUG_VOID_RETURN;
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}

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/*
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  unlock_slave_threads()
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*/
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void unlock_slave_threads(Master_info* mi)
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{
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  DBUG_ENTER("unlock_slave_threads");

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  //TODO: see if we can do this without dual mutex
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  mysql_mutex_unlock(&mi->rli.run_lock);
  mysql_mutex_unlock(&mi->run_lock);
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  DBUG_VOID_RETURN;
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}

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#ifdef HAVE_PSI_INTERFACE
static PSI_thread_key key_thread_slave_io, key_thread_slave_sql;

static PSI_thread_info all_slave_threads[]=
{
  { &key_thread_slave_io, "slave_io", PSI_FLAG_GLOBAL},
  { &key_thread_slave_sql, "slave_sql", PSI_FLAG_GLOBAL}
};

static void init_slave_psi_keys(void)
{
  const char* category= "sql";
  int count;

  if (PSI_server == NULL)
    return;

  count= array_elements(all_slave_threads);
  PSI_server->register_thread(category, all_slave_threads, count);
}
#endif /* HAVE_PSI_INTERFACE */
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/* Initialize slave structures */
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int init_slave()
{
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  DBUG_ENTER("init_slave");
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  int error= 0;
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#ifdef HAVE_PSI_INTERFACE
  init_slave_psi_keys();
#endif

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  /*
    This is called when mysqld starts. Before client connections are
    accepted. However bootstrap may conflict with us if it does START SLAVE.
    So it's safer to take the lock.
  */
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  mysql_mutex_lock(&LOCK_active_mi);
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  if (pthread_key_create(&RPL_MASTER_INFO, NULL))
    goto err;
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  master_info_index= new Master_info_index;
  if (!master_info_index || master_info_index->init_all_master_info())
  {
    sql_print_error("Failed to initialize multi master structures");
    mysql_mutex_unlock(&LOCK_active_mi);
    DBUG_RETURN(1);
  }
  if (!(active_mi= new Master_info(&default_master_connection_name,
                                   relay_log_recovery)) ||
      active_mi->error())
  {
    delete active_mi;
    active_mi= 0;
    goto err;
  }

  if (master_info_index->add_master_info(active_mi, FALSE))
  {
    delete active_mi;
    active_mi= 0;
    goto err;
  }

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  /*
    If --slave-skip-errors=... was not used, the string value for the
    system variable has not been set up yet. Do it now.
  */
  if (!use_slave_mask)
  {
    print_slave_skip_errors();
  }

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  /*
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    If master_host is not specified, try to read it from the master_info file.
    If master_host is specified, create the master_info file if it doesn't
    exists.
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  */
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  if (init_master_info(active_mi,master_info_file,relay_log_info_file,
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                       1, (SLAVE_IO | SLAVE_SQL)))
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  {
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    sql_print_error("Failed to initialize the master info structure");
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    goto err;
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  }
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  /* If server id is not set, start_slave_thread() will say it */

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  if (active_mi->host[0] && !opt_skip_slave_start)
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  {
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    if (start_slave_threads(1 /* need mutex */,
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                            0 /* no wait for start*/,
                            active_mi,
                            master_info_file,
                            relay_log_info_file,
                            SLAVE_IO | SLAVE_SQL))
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    {
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      sql_print_error("Failed to create slave threads");
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      goto err;
    }
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  }

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end:
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  mysql_mutex_unlock(&LOCK_active_mi);
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  DBUG_RETURN(error);
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err:
  sql_print_error("Failed to allocate memory for the Master Info structure");
  error= 1;
  goto end;
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}
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/*
  Updates the master info based on the information stored in the
  relay info and ignores relay logs previously retrieved by the IO 
  thread, which thus starts fetching again based on to the  
  group_master_log_pos and group_master_log_name. Eventually, the old
  relay logs will be purged by the normal purge mechanism.

  In the feature, we should improve this routine in order to avoid throwing
  away logs that are safely stored in the disk. Note also that this recovery 
  routine relies on the correctness of the relay-log.info and only tolerates 
  coordinate problems in master.info.
  
  In this function, there is no need for a mutex as the caller 
  (i.e. init_slave) already has one acquired.
  
  Specifically, the following structures are updated:
 
  1 - mi->master_log_pos  <-- rli->group_master_log_pos
  2 - mi->master_log_name <-- rli->group_master_log_name
  3 - It moves the relay log to the new relay log file, by
      rli->group_relay_log_pos  <-- BIN_LOG_HEADER_SIZE;
      rli->event_relay_log_pos  <-- BIN_LOG_HEADER_SIZE;
      rli->group_relay_log_name <-- rli->relay_log.get_log_fname();
      rli->event_relay_log_name <-- rli->relay_log.get_log_fname();
  
   If there is an error, it returns (1), otherwise returns (0).
 */
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int init_recovery(Master_info* mi, const char** errmsg)
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{
  DBUG_ENTER("init_recovery");
 
  Relay_log_info *rli= &mi->rli;
  if (rli->group_master_log_name[0])
  {
    mi->master_log_pos= max(BIN_LOG_HEADER_SIZE,
                             rli->group_master_log_pos);
    strmake(mi->master_log_name, rli->group_master_log_name,
            sizeof(mi->master_log_name)-1);
 
    sql_print_warning("Recovery from master pos %ld and file %s.",
                      (ulong) mi->master_log_pos, mi->master_log_name);
 
    strmake(rli->group_relay_log_name, rli->relay_log.get_log_fname(),
            sizeof(rli->group_relay_log_name)-1);
    strmake(rli->event_relay_log_name, rli->relay_log.get_log_fname(),
            sizeof(mi->rli.event_relay_log_name)-1);
 
    rli->group_relay_log_pos= rli->event_relay_log_pos= BIN_LOG_HEADER_SIZE;
  }
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  DBUG_RETURN(0);
}
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/**
  Convert slave skip errors bitmap into a printable string.
*/

static void print_slave_skip_errors(void)
{
  /*
    To be safe, we want 10 characters of room in the buffer for a number
    plus terminators. Also, we need some space for constant strings.
    10 characters must be sufficient for a number plus {',' | '...'}
    plus a NUL terminator. That is a max 6 digit number.
  */
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  const size_t MIN_ROOM= 10;
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  DBUG_ENTER("print_slave_skip_errors");
  DBUG_ASSERT(sizeof(slave_skip_error_names) > MIN_ROOM);
  DBUG_ASSERT(MAX_SLAVE_ERROR <= 999999); // 6 digits

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  /* Make @@slave_skip_errors show the nice human-readable value.  */
  opt_slave_skip_errors= slave_skip_error_names;

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  if (!use_slave_mask || bitmap_is_clear_all(&slave_error_mask))
  {
    /* purecov: begin tested */
    memcpy(slave_skip_error_names, STRING_WITH_LEN("OFF"));
    /* purecov: end */
  }
  else if (bitmap_is_set_all(&slave_error_mask))
  {
    /* purecov: begin tested */
    memcpy(slave_skip_error_names, STRING_WITH_LEN("ALL"));
    /* purecov: end */
  }
  else
  {
    char *buff= slave_skip_error_names;
    char *bend= buff + sizeof(slave_skip_error_names);
    int  errnum;

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    for (errnum= 0; errnum < MAX_SLAVE_ERROR; errnum++)
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    {
      if (bitmap_is_set(&slave_error_mask, errnum))
      {
        if (buff + MIN_ROOM >= bend)
          break; /* purecov: tested */
        buff= int10_to_str(errnum, buff, 10);
        *buff++= ',';
      }
    }
    if (buff != slave_skip_error_names)
      buff--; // Remove last ','
    if (errnum < MAX_SLAVE_ERROR)
    {
      /* Couldn't show all errors */
      buff= strmov(buff, "..."); /* purecov: tested */
    }
    *buff=0;
  }
  DBUG_PRINT("init", ("error_names: '%s'", slave_skip_error_names));
  DBUG_VOID_RETURN;
}

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/*
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  Init function to set up array for errors that should be skipped for slave
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  SYNOPSIS
    init_slave_skip_errors()
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    arg         List of errors numbers to skip, separated with ','
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  NOTES
    Called from get_options() in mysqld.cc on start-up
*/
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void init_slave_skip_errors(const char* arg)
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{
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  const char *p;
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  DBUG_ENTER("init_slave_skip_errors");

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  if (bitmap_init(&slave_error_mask,0,MAX_SLAVE_ERROR,0))
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  {
    fprintf(stderr, "Badly out of memory, please check your system status\n");
    exit(1);
  }
  use_slave_mask = 1;
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  for (;my_isspace(system_charset_info,*arg);++arg)
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    /* empty */;
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  if (!my_strnncoll(system_charset_info,(uchar*)arg,4,(const uchar*)"all",4))
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  {
    bitmap_set_all(&slave_error_mask);
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    print_slave_skip_errors();
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    DBUG_VOID_RETURN;
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  }
  for (p= arg ; *p; )
  {
    long err_code;
    if (!(p= str2int(p, 10, 0, LONG_MAX, &err_code)))
      break;
    if (err_code < MAX_SLAVE_ERROR)
       bitmap_set_bit(&slave_error_mask,(uint)err_code);
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    while (!my_isdigit(system_charset_info,*p) && *p)
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      p++;
  }
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  /* Convert slave skip errors bitmap into a printable string. */
  print_slave_skip_errors();
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  DBUG_VOID_RETURN;
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}

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static void set_thd_in_use_temporary_tables(Relay_log_info *rli)
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{
  TABLE *table;

  for (table= rli->save_temporary_tables ; table ; table= table->next)
    table->in_use= rli->sql_thd;
}
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int terminate_slave_threads(Master_info* mi,int thread_mask,bool skip_lock)
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{
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  DBUG_ENTER("terminate_slave_threads");

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  if (!mi->inited)
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    DBUG_RETURN(0); /* successfully do nothing */
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  int error,force_all = (thread_mask & SLAVE_FORCE_ALL);
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  mysql_mutex_t *sql_lock = &mi->rli.run_lock, *io_lock = &mi->run_lock;
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  mysql_mutex_t *log_lock= mi->rli.relay_log.get_log_lock();
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  if (thread_mask & (SLAVE_SQL|SLAVE_FORCE_ALL))
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  {
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    DBUG_PRINT("info",("Terminating SQL thread"));
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    mi->rli.abort_slave=1;
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    if ((error=terminate_slave_thread(mi->rli.sql_thd, sql_lock,
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                                      &mi->rli.stop_cond,
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                                      &mi->rli.slave_running,
                                      skip_lock)) &&
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        !force_all)
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      DBUG_RETURN(error);
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    mysql_mutex_lock(log_lock);
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    DBUG_PRINT("info",("Flushing relay-log info file."));
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    if (current_thd)
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      thd_proc_info(current_thd, "Flushing relay-log info file.");
    if (flush_relay_log_info(&mi->rli))
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      DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);
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    if (my_sync(mi->rli.info_fd, MYF(MY_WME)))
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      DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);

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    mysql_mutex_unlock(log_lock);
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  }
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  if (thread_mask & (SLAVE_IO|SLAVE_FORCE_ALL))
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  {
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    DBUG_PRINT("info",("Terminating IO thread"));
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    mi->abort_slave=1;
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    if ((error=terminate_slave_thread(mi->io_thd, io_lock,
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                                      &mi->stop_cond,
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                                      &mi->slave_running,
                                      skip_lock)) &&
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        !force_all)
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      DBUG_RETURN(error);
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    mysql_mutex_lock(log_lock);
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    DBUG_PRINT("info",("Flushing relay log and master info file."));
    if (current_thd)
      thd_proc_info(current_thd, "Flushing relay log and master info files.");
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    if (flush_master_info(mi, TRUE, FALSE))
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      DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);

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    if (mi->rli.relay_log.is_open() &&
        my_sync(mi->rli.relay_log.get_log_file()->file, MYF(MY_WME)))
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      DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);

    if (my_sync(mi->fd, MYF(MY_WME)))
      DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);

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    mysql_mutex_unlock(log_lock);
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  }
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  DBUG_RETURN(0); 
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}

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/**
   Wait for a slave thread to terminate.

   This function is called after requesting the thread to terminate
   (by setting @c abort_slave member of @c Relay_log_info or @c
   Master_info structure to 1). Termination of the thread is
   controlled with the the predicate <code>*slave_running</code>.

   Function will acquire @c term_lock before waiting on the condition
   unless @c skip_lock is true in which case the mutex should be owned
   by the caller of this function and will remain acquired after
   return from the function.

   @param term_lock
          Associated lock to use when waiting for @c term_cond

   @param term_cond
          Condition that is signalled when the thread has terminated

   @param slave_running
          Pointer to predicate to check for slave thread termination

   @param skip_lock
          If @c true the lock will not be acquired before waiting on
          the condition. In this case, it is assumed that the calling
          function acquires the lock before calling this function.

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   @retval 0 All OK ER_SLAVE_NOT_RUNNING otherwise.
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   @note  If the executing thread has to acquire term_lock (skip_lock
          is false), the negative running status does not represent
          any issue therefore no error is reported.
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 */
static int
terminate_slave_thread(THD *thd,
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                       mysql_mutex_t *term_lock,
                       mysql_cond_t *term_cond,
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                       volatile uint *slave_running,
                       bool skip_lock)
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{
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  DBUG_ENTER("terminate_slave_thread");
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  if (!skip_lock)
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  {
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    mysql_mutex_lock(term_lock);
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  }
  else
  {
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    mysql_mutex_assert_owner(term_lock);
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  }
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  if (!*slave_running)
  {
    if (!skip_lock)
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    {
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      /*
        if run_lock (term_lock) is acquired locally then either
        slave_running status is fine
      */
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      mysql_mutex_unlock(term_lock);
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      DBUG_RETURN(0);
    }
    else
    {
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      DBUG_RETURN(ER_SLAVE_NOT_RUNNING);
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    }
  }
  DBUG_ASSERT(thd != 0);
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  THD_CHECK_SENTRY(thd);
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  /*
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    Is is critical to test if the slave is running. Otherwise, we might
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    be referening freed memory trying to kick it
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  */
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  while (*slave_running)                        // Should always be true
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  {
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    int error __attribute__((unused));
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    DBUG_PRINT("loop", ("killing slave thread"));
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    mysql_mutex_lock(&thd->LOCK_thd_data);
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#ifndef DONT_USE_THR_ALARM
    /*
      Error codes from pthread_kill are:
      EINVAL: invalid signal number (can't happen)
      ESRCH: thread already killed (can happen, should be ignored)
    */
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    int err __attribute__((unused))= pthread_kill(thd->real_id, thr_client_alarm);
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    DBUG_ASSERT(err != EINVAL);
#endif
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    thd->awake(NOT_KILLED);

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    mysql_mutex_unlock(&thd->LOCK_thd_data);
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    /*
      There is a small chance that slave thread might miss the first
      alarm. To protect againts it, resend the signal until it reacts
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    */
    struct timespec abstime;
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    set_timespec(abstime,2);
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    error= mysql_cond_timedwait(term_cond, term_lock, &abstime);
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    DBUG_ASSERT(error == ETIMEDOUT || error == 0);
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  }
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  DBUG_ASSERT(*slave_running == 0);

  if (!skip_lock)
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    mysql_mutex_unlock(term_lock);
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  DBUG_RETURN(0);
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}

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int start_slave_thread(
#ifdef HAVE_PSI_INTERFACE
                       PSI_thread_key thread_key,
#endif
                       pthread_handler h_func, mysql_mutex_t *start_lock,
                       mysql_mutex_t *cond_lock,
                       mysql_cond_t *start_cond,
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                       volatile uint *slave_running,
                       volatile ulong *slave_run_id,
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                       Master_info* mi)
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{
  pthread_t th;
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  ulong start_id;
  DBUG_ENTER("start_slave_thread");

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  DBUG_ASSERT(mi->inited);

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  if (start_lock)
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    mysql_mutex_lock(start_lock);
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  if (!global_system_variables.server_id)
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  {
    if (start_cond)
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      mysql_cond_broadcast(start_cond);
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    if (start_lock)
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      mysql_mutex_unlock(start_lock);
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    sql_print_error("Server id not set, will not start slave");
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    DBUG_RETURN(ER_BAD_SLAVE);
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  }
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  if (*slave_running)
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  {
    if (start_cond)
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      mysql_cond_broadcast(start_cond);
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    if (start_lock)
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      mysql_mutex_unlock(start_lock);
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    DBUG_RETURN(ER_SLAVE_MUST_STOP);
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  }
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  start_id= *slave_run_id;
  DBUG_PRINT("info",("Creating new slave thread"));
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  if (mysql_thread_create(thread_key,
                          &th, &connection_attrib, h_func, (void*)mi))
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  {
    if (start_lock)
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      mysql_mutex_unlock(start_lock);
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    DBUG_RETURN(ER_SLAVE_THREAD);
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  }
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  if (start_cond && cond_lock) // caller has cond_lock
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  {
    THD* thd = current_thd;
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    while (start_id == *slave_run_id)
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    {
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      DBUG_PRINT("sleep",("Waiting for slave thread to start"));
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      const char *old_msg= thd->enter_cond(start_cond, cond_lock,
                                           "Waiting for slave thread to start");
      /*
        It is not sufficient to test this at loop bottom. We must test
        it after registering the mutex in enter_cond(). If the kill
        happens after testing of thd->killed and before the mutex is
        registered, we could otherwise go waiting though thd->killed is
        set.
      */
      if (!thd->killed)
        mysql_cond_wait(start_cond, cond_lock);
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      thd->exit_cond(old_msg);
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      mysql_mutex_lock(cond_lock); // re-acquire it as exit_cond() released
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      if (thd->killed)
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      {
        if (start_lock)
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          mysql_mutex_unlock(start_lock);
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        DBUG_RETURN(thd->killed_errno());
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      }
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    }
  }
  if (start_lock)
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    mysql_mutex_unlock(start_lock);
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  DBUG_RETURN(0);
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}
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/*
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  start_slave_threads()
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  NOTES
    SLAVE_FORCE_ALL is not implemented here on purpose since it does not make
    sense to do that for starting a slave--we always care if it actually
    started the threads that were not previously running
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*/
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int start_slave_threads(bool need_slave_mutex, bool wait_for_start,
782
                        Master_info* mi, const char* master_info_fname,
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                        const char* slave_info_fname, int thread_mask)
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{
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  mysql_mutex_t *lock_io=0, *lock_sql=0, *lock_cond_io=0, *lock_cond_sql=0;
  mysql_cond_t* cond_io=0, *cond_sql=0;
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  int error=0;
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  const char *errmsg;
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  DBUG_ENTER("start_slave_threads");
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  if (need_slave_mutex)
  {
    lock_io = &mi->run_lock;
    lock_sql = &mi->rli.run_lock;
  }
  if (wait_for_start)
  {
    cond_io = &mi->start_cond;
    cond_sql = &mi->rli.start_cond;
    lock_cond_io = &mi->run_lock;
    lock_cond_sql = &mi->rli.run_lock;
  }
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  /*
    If we are using GTID and both SQL and IO threads are stopped, then get
    rid of all relay logs.

    Relay logs are not very useful when using GTID, except as a buffer
    between the fetch in the IO thread and the apply in SQL thread. However
    while one of the threads is running, they are in use and cannot be
    removed.
  */
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  if (mi->using_gtid != Master_info::USE_GTID_NO &&
      !mi->slave_running && !mi->rli.slave_running)
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  {
    purge_relay_logs(&mi->rli, NULL, 0, &errmsg);
    mi->master_log_name[0]= 0;
    mi->master_log_pos= 0;
  }

821
  if (thread_mask & SLAVE_IO)
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    error= start_slave_thread(
#ifdef HAVE_PSI_INTERFACE
                              key_thread_slave_io,
#endif
                              handle_slave_io, lock_io, lock_cond_io,
                              cond_io,
                              &mi->slave_running, &mi->slave_run_id,
                              mi);
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  if (!error && (thread_mask & SLAVE_SQL))
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  {
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    error= start_slave_thread(
#ifdef HAVE_PSI_INTERFACE
                              key_thread_slave_sql,
#endif
                              handle_slave_sql, lock_sql, lock_cond_sql,
                              cond_sql,
                              &mi->rli.slave_running, &mi->rli.slave_run_id,
                              mi);
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    if (error)
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      terminate_slave_threads(mi, thread_mask & SLAVE_IO, !need_slave_mutex);
842
  }
843
  DBUG_RETURN(error);
844
}
845

846

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/*
848
  Release slave threads at time of executing shutdown.
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  SYNOPSIS
    end_slave()
*/
853

854 855
void end_slave()
{
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  DBUG_ENTER("end_slave");

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  /*
    This is called when the server terminates, in close_connections().
    It terminates slave threads. However, some CHANGE MASTER etc may still be
    running presently. If a START SLAVE was in progress, the mutex lock below
    will make us wait until slave threads have started, and START SLAVE
    returns, then we terminate them here.
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    We can also be called by cleanup(), which only happens if some
    startup parameter to the server was wrong.
867
  */
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  mysql_mutex_lock(&LOCK_active_mi);
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  /* This will call terminate_slave_threads() on all connections */
  delete master_info_index;
  master_info_index= 0;
  active_mi= 0;
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  mysql_mutex_unlock(&LOCK_active_mi);
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  free_all_rpl_filters();
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  DBUG_VOID_RETURN;
}

878
static bool io_slave_killed(THD* thd, Master_info* mi)
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{
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  DBUG_ENTER("io_slave_killed");

882
  DBUG_ASSERT(mi->io_thd == thd);
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  DBUG_ASSERT(mi->slave_running); // tracking buffer overrun
884
  DBUG_RETURN(mi->abort_slave || abort_loop || thd->killed);
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}

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/**
   The function analyzes a possible killed status and makes
   a decision whether to accept it or not.
   Normally upon accepting the sql thread goes to shutdown.
   In the event of deffering decision @rli->last_event_start_time waiting
   timer is set to force the killed status be accepted upon its expiration.
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   @param thd   pointer to a THD instance
   @param rli   pointer to Relay_log_info instance
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   @return TRUE the killed status is recognized, FALSE a possible killed
           status is deferred.
*/
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static bool sql_slave_killed(THD* thd, Relay_log_info* rli)
901
{
902
  bool ret= FALSE;
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  DBUG_ENTER("sql_slave_killed");

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  DBUG_ASSERT(rli->sql_thd == thd);
  DBUG_ASSERT(rli->slave_running == 1);// tracking buffer overrun
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  if (abort_loop || thd->killed || rli->abort_slave)
  {
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    /*
      The transaction should always be binlogged if OPTION_KEEP_LOG is set
      (it implies that something can not be rolled back). And such case
      should be regarded similarly as modifing a non-transactional table
      because retrying of the transaction will lead to an error or inconsistency
      as well.
      Example: OPTION_KEEP_LOG is set if a temporary table is created or dropped.
    */
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    if ((thd->transaction.all.modified_non_trans_table ||
         (thd->variables.option_bits & OPTION_KEEP_LOG))
        && rli->is_in_group())
920
    {
921
      char msg_stopped[]=
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        "... Slave SQL Thread stopped with incomplete event group "
        "having non-transactional changes. "
        "If the group consists solely of row-based events, you can try "
        "to restart the slave with --slave-exec-mode=IDEMPOTENT, which "
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        "ignores duplicate key, key not found, and similar errors (see "
        "documentation for details).";

      if (rli->abort_slave)
      {
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        DBUG_PRINT("info", ("Request to stop slave SQL Thread received while "
                            "applying a group that has non-transactional "
                            "changes; waiting for completion of the group ... "));
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        /*
          Slave sql thread shutdown in face of unfinished group modified 
          Non-trans table is handled via a timer. The slave may eventually
          give out to complete the current group and in that case there
          might be issues at consequent slave restart, see the error message.
          WL#2975 offers a robust solution requiring to store the last exectuted
          event's coordinates along with the group's coordianates
          instead of waiting with @c last_event_start_time the timer.
        */

        if (rli->last_event_start_time == 0)
          rli->last_event_start_time= my_time(0);
        ret= difftime(my_time(0), rli->last_event_start_time) <=
          SLAVE_WAIT_GROUP_DONE ? FALSE : TRUE;

        DBUG_EXECUTE_IF("stop_slave_middle_group", 
                        DBUG_EXECUTE_IF("incomplete_group_in_relay_log",
                                        ret= TRUE;);); // time is over

        if (ret == 0)
        {
          rli->report(WARNING_LEVEL, 0,
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                      "Request to stop slave SQL Thread received while "
                      "applying a group that has non-transactional "
                      "changes; waiting for completion of the group ... ");
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        }
        else
        {
          rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
                      ER(ER_SLAVE_FATAL_ERROR), msg_stopped);
        }
      }
      else
      {
        ret= TRUE;
        rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, ER(ER_SLAVE_FATAL_ERROR),
                    msg_stopped);
      }
    }
    else
    {
      ret= TRUE;
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    }
  }
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  if (ret)
    rli->last_event_start_time= 0;
  
  DBUG_RETURN(ret);
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}

985

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/*
987 988
  skip_load_data_infile()

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  NOTES
    This is used to tell a 3.23 master to break send_file()
*/
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void skip_load_data_infile(NET *net)
{
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  DBUG_ENTER("skip_load_data_infile");

997
  (void)net_request_file(net, "/dev/null");
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  (void)my_net_read(net);                               // discard response
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  (void)net_write_command(net, 0, (uchar*) "", 0, (uchar*) "", 0); // ok
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  DBUG_VOID_RETURN;
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}

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1004
bool net_request_file(NET* net, const char* fname)
1005
{
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  DBUG_ENTER("net_request_file");
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  DBUG_RETURN(net_write_command(net, 251, (uchar*) fname, strlen(fname),
                                (uchar*) "", 0));
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}

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/*
  From other comments and tests in code, it looks like
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  sometimes Query_log_event and Load_log_event can have db == 0
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  (see rewrite_db() above for example)
  (cases where this happens are unclear; it may be when the master is 3.23).
*/
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const char *print_slave_db_safe(const char* db)
1019
{
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  DBUG_ENTER("*print_slave_db_safe");

  DBUG_RETURN((db ? db : ""));
1023
}
1024

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#endif /* HAVE_REPLICATION */

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int init_strvar_from_file(char *var, int max_size, IO_CACHE *f,
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                                 const char *default_val)
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{
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  uint length;
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  DBUG_ENTER("init_strvar_from_file");

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  if ((length=my_b_gets(f,var, max_size)))
  {
    char* last_p = var + length -1;
    if (*last_p == '\n')
      *last_p = 0; // if we stopped on newline, kill it
    else
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    {
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      /*
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        If we truncated a line or stopped on last char, remove all chars
        up to and including newline.
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      */
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      int c;
1045
      while (((c=my_b_get(f)) != '\n' && c != my_b_EOF)) ;
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    }
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    DBUG_RETURN(0);
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  }
  else if (default_val)
  {
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    strmake(var,  default_val, max_size-1);
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    DBUG_RETURN(0);
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  }
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  DBUG_RETURN(1);
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}

1057

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/*
  when moving these functions to mysys, don't forget to
  remove slave.cc from libmysqld/CMakeLists.txt
*/
1062
int init_intvar_from_file(int* var, IO_CACHE* f, int default_val)
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{
  char buf[32];
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  DBUG_ENTER("init_intvar_from_file");

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  if (my_b_gets(f, buf, sizeof(buf)))
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  {
    *var = atoi(buf);
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    DBUG_RETURN(0);
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  }
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  else if (default_val)
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  {
    *var = default_val;
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    DBUG_RETURN(0);
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  }
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  DBUG_RETURN(1);
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}

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int init_floatvar_from_file(float* var, IO_CACHE* f, float default_val)
{
  char buf[16];
  DBUG_ENTER("init_floatvar_from_file");


  if (my_b_gets(f, buf, sizeof(buf)))
  {
    if (sscanf(buf, "%f", var) != 1)
      DBUG_RETURN(1);
    else
      DBUG_RETURN(0);
  }
  else if (default_val != 0.0)
  {
    *var = default_val;
    DBUG_RETURN(0);
  }
  DBUG_RETURN(1);
}

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/**
   A master info read method

   This function is called from @c init_master_info() along with
   relatives to restore some of @c active_mi members.
   Particularly, this function is responsible for restoring
   IGNORE_SERVER_IDS list of servers whose events the slave is
   going to ignore (to not log them in the relay log).
   Items being read are supposed to be decimal output of values of a
   type shorter or equal of @c long and separated by the single space.

   @param arr         @c DYNAMIC_ARRAY pointer to storage for servers id
   @param f           @c IO_CACHE pointer to the source file

   @retval 0         All OK
   @retval non-zero  An error
*/

int init_dynarray_intvar_from_file(DYNAMIC_ARRAY* arr, IO_CACHE* f)
{
  int ret= 0;
  char buf[16 * (sizeof(long)*4 + 1)]; // static buffer to use most of times
  char *buf_act= buf; // actual buffer can be dynamic if static is short
  char *token, *last;
  uint num_items;     // number of items of `arr'
  size_t read_size;
  DBUG_ENTER("init_dynarray_intvar_from_file");

  if ((read_size= my_b_gets(f, buf_act, sizeof(buf))) == 0)
  {
    return 0; // no line in master.info
  }
  if (read_size + 1 == sizeof(buf) && buf[sizeof(buf) - 2] != '\n')
  {
    /*
      short read happend; allocate sufficient memory and make the 2nd read
    */
    char buf_work[(sizeof(long)*3 + 1)*16];
    memcpy(buf_work, buf, sizeof(buf_work));
    num_items= atoi(strtok_r(buf_work, " ", &last));
    size_t snd_size;
    /*
      max size lower bound approximate estimation bases on the formula:
      (the items number + items themselves) * 
          (decimal size + space) - 1 + `\n' + '\0'
    */
    size_t max_size= (1 + num_items) * (sizeof(long)*3 + 1) + 1;
    buf_act= (char*) my_malloc(max_size, MYF(MY_WME));
    memcpy(buf_act, buf, read_size);
    snd_size= my_b_gets(f, buf_act + read_size, max_size - read_size);
    if (snd_size == 0 ||
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        ((snd_size + 1 == max_size - read_size) &&  buf_act[max_size - 2] != '\n'))
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    {
      /*
        failure to make the 2nd read or short read again
      */
      ret= 1;
      goto err;
    }
  }
  token= strtok_r(buf_act, " ", &last);
  if (token == NULL)
  {
    ret= 1;
    goto err;
  }
  num_items= atoi(token);
  for (uint i=0; i < num_items; i++)
  {
    token= strtok_r(NULL, " ", &last);
    if (token == NULL)
    {
      ret= 1;
      goto err;
    }
    else
    {
      ulong val= atol(token);
      insert_dynamic(arr, (uchar *) &val);
    }
  }
err:
  if (buf_act != buf)
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    my_free(buf_act);
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  DBUG_RETURN(ret);
}

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#ifdef HAVE_REPLICATION

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/*
  Check if the error is caused by network.
  @param[in]   errorno   Number of the error.
  RETURNS:
  TRUE         network error
  FALSE        not network error
*/

bool is_network_error(uint errorno)
{ 
  if (errorno == CR_CONNECTION_ERROR || 
      errorno == CR_CONN_HOST_ERROR ||
      errorno == CR_SERVER_GONE_ERROR ||
      errorno == CR_SERVER_LOST ||
      errorno == ER_CON_COUNT_ERROR ||
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      errorno == ER_CONNECTION_KILLED ||
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      errorno == ER_NEW_ABORTING_CONNECTION ||
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      errorno == ER_SERVER_SHUTDOWN)
    return TRUE;

  return FALSE;   
}


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/*
  Note that we rely on the master's version (3.23, 4.0.14 etc) instead of
  relying on the binlog's version. This is not perfect: imagine an upgrade
  of the master without waiting that all slaves are in sync with the master;
  then a slave could be fooled about the binlog's format. This is what happens
  when people upgrade a 3.23 master to 4.0 without doing RESET MASTER: 4.0
  slaves are fooled. So we do this only to distinguish between 3.23 and more
  recent masters (it's too late to change things for 3.23).
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  RETURNS
  0       ok
  1       error
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  2       transient network problem, the caller should try to reconnect
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*/
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static int get_master_version_and_clock(MYSQL* mysql, Master_info* mi)
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{
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  char err_buff[MAX_SLAVE_ERRMSG], err_buff2[MAX_SLAVE_ERRMSG];
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  const char* errmsg= 0;
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  int err_code= 0;
  MYSQL_RES *master_res= 0;
  MYSQL_ROW master_row;
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  uint version= mysql_get_server_version(mysql) / 10000;
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  DBUG_ENTER("get_master_version_and_clock");
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  /*
    Free old description_event_for_queue (that is needed if we are in
    a reconnection).
  */
  delete mi->rli.relay_log.description_event_for_queue;
  mi->rli.relay_log.description_event_for_queue= 0;
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  if (!my_isdigit(&my_charset_bin,*mysql->server_version))
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  {
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    errmsg= err_buff2;
    snprintf(err_buff2, sizeof(err_buff2),
             "Master reported unrecognized MySQL version: %s",
             mysql->server_version);
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    err_code= ER_SLAVE_FATAL_ERROR;
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    sprintf(err_buff, ER(err_code), err_buff2);
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  }
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  else
  {
    /*
      Note the following switch will bug when we have MySQL branch 30 ;)
    */
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    switch (version) {
    case 0:
    case 1:
    case 2:
      errmsg= err_buff2;
      snprintf(err_buff2, sizeof(err_buff2),
               "Master reported unrecognized MySQL version: %s",
               mysql->server_version);
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      err_code= ER_SLAVE_FATAL_ERROR;
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      sprintf(err_buff, ER(err_code), err_buff2);
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      break;
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    case 3:
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      mi->rli.relay_log.description_event_for_queue= new
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        Format_description_log_event(1, mysql->server_version);
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      break;
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    case 4:
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      mi->rli.relay_log.description_event_for_queue= new
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        Format_description_log_event(3, mysql->server_version);
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      break;
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    default:
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      /*
        Master is MySQL >=5.0. Give a default Format_desc event, so that we can
        take the early steps (like tests for "is this a 3.23 master") which we
        have to take before we receive the real master's Format_desc which will
        override this one. Note that the Format_desc we create below is garbage
        (it has the format of the *slave*); it's only good to help know if the
        master is 3.23, 4.0, etc.
      */
      mi->rli.relay_log.description_event_for_queue= new
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        Format_description_log_event(4, mysql->server_version);
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      break;
    }
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  }
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  /*
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     This does not mean that a 5.0 slave will be able to read a 6.0 master; but
     as we don't know yet, we don't want to forbid this for now. If a 5.0 slave
     can't read a 6.0 master, this will show up when the slave can't read some
     events sent by the master, and there will be error messages.
  */
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1303
  if (errmsg)
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    goto err;
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  /* as we are here, we tried to allocate the event */
  if (!mi->rli.relay_log.description_event_for_queue)
  {
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    errmsg= "default Format_description_log_event";
    err_code= ER_SLAVE_CREATE_EVENT_FAILURE;
    sprintf(err_buff, ER(err_code), errmsg);
    goto err;
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  }

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  /*
    FD_q's (A) is set initially from RL's (A): FD_q.(A) := RL.(A).
    It's necessary to adjust FD_q.(A) at this point because in the following
    course FD_q is going to be dumped to RL.
    Generally FD_q is derived from a received FD_m (roughly FD_q := FD_m) 
    in queue_event and the master's (A) is installed.
    At one step with the assignment the Relay-Log's checksum alg is set to 
    a new value: RL.(A) := FD_q.(A). If the slave service is stopped
    the last time assigned RL.(A) will be passed over to the restarting
    service (to the current execution point).
    RL.A is a "codec" to verify checksum in queue_event() almost all the time
    the first fake Rotate event.
    Starting from this point IO thread will executes the following checksum
    warmup sequence  of actions:

    FD_q.A := RL.A,
    A_m^0 := master.@@global.binlog_checksum,
    {queue_event(R_f): verifies(R_f, A_m^0)},
    {queue_event(FD_m): verifies(FD_m, FD_m.A), dump(FD_q), rotate(RL),
                        FD_q := FD_m, RL.A := FD_q.A)}

    See legends definition on MYSQL_BIN_LOG::relay_log_checksum_alg
    docs lines (binlog.h).
    In above A_m^0 - the value of master's
    @@binlog_checksum determined in the upcoming handshake (stored in
    mi->checksum_alg_before_fd).


    After the warm-up sequence IO gets to "normal" checksum verification mode
    to use RL.A in 
    
    {queue_event(E_m): verifies(E_m, RL.A)}

    until it has received a new FD_m.
  */
  mi->rli.relay_log.description_event_for_queue->checksum_alg=
    mi->rli.relay_log.relay_log_checksum_alg;

  DBUG_ASSERT(mi->rli.relay_log.description_event_for_queue->checksum_alg !=
              BINLOG_CHECKSUM_ALG_UNDEF);
  DBUG_ASSERT(mi->rli.relay_log.relay_log_checksum_alg !=
              BINLOG_CHECKSUM_ALG_UNDEF); 
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  /*
    Compare the master and slave's clock. Do not die if master's clock is
    unavailable (very old master not supporting UNIX_TIMESTAMP()?).
  */
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#ifdef ENABLED_DEBUG_SYNC
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  DBUG_EXECUTE_IF("dbug.before_get_UNIX_TIMESTAMP",
                  {
                    const char act[]=
                      "now "
                      "wait_for signal.get_unix_timestamp";
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                    DBUG_ASSERT(debug_sync_service);
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                    DBUG_ASSERT(!debug_sync_set_action(current_thd,
                                                       STRING_WITH_LEN(act)));
                  };);
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#endif
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  master_res= NULL;
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  if (!mysql_real_query(mysql, STRING_WITH_LEN("SELECT UNIX_TIMESTAMP()")) &&
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      (master_res= mysql_store_result(mysql)) &&
      (master_row= mysql_fetch_row(master_res)))
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  {
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    mi->clock_diff_with_master=
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      (long) (time((time_t*) 0) - strtoul(master_row[0], 0, 10));
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  }
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  else if (check_io_slave_killed(mi->io_thd, mi, NULL))
    goto slave_killed_err;
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  else if (is_network_error(mysql_errno(mysql)))
  {
    mi->report(WARNING_LEVEL, mysql_errno(mysql),
               "Get master clock failed with error: %s", mysql_error(mysql));
    goto network_err;
  }
  else 
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  {
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    mi->clock_diff_with_master= 0; /* The "most sensible" value */
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    sql_print_warning("\"SELECT UNIX_TIMESTAMP()\" failed on master, "
                      "do not trust column Seconds_Behind_Master of SHOW "
                      "SLAVE STATUS. Error: %s (%d)",
                      mysql_error(mysql), mysql_errno(mysql));
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  }
  if (master_res)
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  {
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    mysql_free_result(master_res);
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    master_res= NULL;
  }
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  /*
    Check that the master's server id and ours are different. Because if they
    are equal (which can result from a simple copy of master's datadir to slave,
    thus copying some my.cnf), replication will work but all events will be
    skipped.
    Do not die if SHOW VARIABLES LIKE 'SERVER_ID' fails on master (very old
    master?).
    Note: we could have put a @@SERVER_ID in the previous SELECT
    UNIX_TIMESTAMP() instead, but this would not have worked on 3.23 masters.
  */
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#ifdef ENABLED_DEBUG_SYNC
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  DBUG_EXECUTE_IF("dbug.before_get_SERVER_ID",
                  {
                    const char act[]=
                      "now "
                      "wait_for signal.get_server_id";
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                    DBUG_ASSERT(debug_sync_service);
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                    DBUG_ASSERT(!debug_sync_set_action(current_thd, 
                                                       STRING_WITH_LEN(act)));
                  };);
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#endif
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  master_res= NULL;
  master_row= NULL;
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  if (!mysql_real_query(mysql,
                        STRING_WITH_LEN("SHOW VARIABLES LIKE 'SERVER_ID'")) &&
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      (master_res= mysql_store_result(mysql)) &&
      (master_row= mysql_fetch_row(master_res)))
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  {
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    if ((global_system_variables.server_id ==
             (mi->master_id= strtoul(master_row[1], 0, 10))) &&
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        !mi->rli.replicate_same_server_id)
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    {
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      errmsg= "The slave I/O thread stops because master and slave have equal \
MySQL server ids; these ids must be different for replication to work (or \
the --replicate-same-server-id option must be used on slave but this does \
not always make sense; please check the manual before using it).";
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      err_code= ER_SLAVE_FATAL_ERROR;
      sprintf(err_buff, ER(err_code), errmsg);
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      goto err;
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    }
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  }
  else if (mysql_errno(mysql))
  {
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    if (check_io_slave_killed(mi->io_thd, mi, NULL))
      goto slave_killed_err;
    else if (is_network_error(mysql_errno(mysql)))
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    {
      mi->report(WARNING_LEVEL, mysql_errno(mysql),
                 "Get master SERVER_ID failed with error: %s", mysql_error(mysql));
      goto network_err;
    }
    /* Fatal error */
    errmsg= "The slave I/O thread stops because a fatal error is encountered \
when it try to get the value of SERVER_ID variable from master.";
    err_code= mysql_errno(mysql);
    sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
    goto err;
  }
  else if (!master_row && master_res)
  {
    mi->report(WARNING_LEVEL, ER_UNKNOWN_SYSTEM_VARIABLE,
               "Unknown system variable 'SERVER_ID' on master, \
maybe it is a *VERY OLD MASTER*.");
  }
  if (master_res)
  {
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    mysql_free_result(master_res);
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    master_res= NULL;
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  }
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  if (mi->master_id == 0 && mi->ignore_server_ids.elements > 0)
  {
    errmsg= "Slave configured with server id filtering could not detect the master server id.";
    err_code= ER_SLAVE_FATAL_ERROR;
    sprintf(err_buff, ER(err_code), errmsg);
    goto err;
  }
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  /*
    Check that the master's global character_set_server and ours are the same.
    Not fatal if query fails (old master?).
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    Note that we don't check for equality of global character_set_client and
    collation_connection (neither do we prevent their setting in
    set_var.cc). That's because from what I (Guilhem) have tested, the global
    values of these 2 are never used (new connections don't use them).
    We don't test equality of global collation_database either as it's is
    going to be deprecated (made read-only) in 4.1 very soon.
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    The test is only relevant if master < 5.0.3 (we'll test only if it's older
    than the 5 branch; < 5.0.3 was alpha...), as >= 5.0.3 master stores
    charset info in each binlog event.
    We don't do it for 3.23 because masters <3.23.50 hang on
    SELECT @@unknown_var (BUG#7965 - see changelog of 3.23.50). So finally we
    test only if master is 4.x.
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  */
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  /* redundant with rest of code but safer against later additions */
1499
  if (version == 3)
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    goto err;
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1502
  if (version == 4)
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  {
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    master_res= NULL;
    if (!mysql_real_query(mysql,
                          STRING_WITH_LEN("SELECT @@GLOBAL.COLLATION_SERVER")) &&
        (master_res= mysql_store_result(mysql)) &&
        (master_row= mysql_fetch_row(master_res)))
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    {
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      if (strcmp(master_row[0], global_system_variables.collation_server->name))
      {
        errmsg= "The slave I/O thread stops because master and slave have \
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different values for the COLLATION_SERVER global variable. The values must \
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be equal for the Statement-format replication to work";
        err_code= ER_SLAVE_FATAL_ERROR;
        sprintf(err_buff, ER(err_code), errmsg);
        goto err;
      }
1519
    }
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    else if (check_io_slave_killed(mi->io_thd, mi, NULL))
      goto slave_killed_err;
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    else if (is_network_error(mysql_errno(mysql)))
    {
      mi->report(WARNING_LEVEL, mysql_errno(mysql),
                 "Get master COLLATION_SERVER failed with error: %s", mysql_error(mysql));
      goto network_err;
    }
    else if (mysql_errno(mysql) != ER_UNKNOWN_SYSTEM_VARIABLE)
    {
      /* Fatal error */
      errmsg= "The slave I/O thread stops because a fatal error is encountered \
when it try to get the value of COLLATION_SERVER global variable from master.";
      err_code= mysql_errno(mysql);
      sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
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      goto err;
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    }
    else
      mi->report(WARNING_LEVEL, ER_UNKNOWN_SYSTEM_VARIABLE,
                 "Unknown system variable 'COLLATION_SERVER' on master, \
maybe it is a *VERY OLD MASTER*. *NOTE*: slave may experience \
inconsistency if replicated data deals with collation.");

    if (master_res)
    {
      mysql_free_result(master_res);
      master_res= NULL;
    }
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  }
1549

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  /*
    Perform analogous check for time zone. Theoretically we also should
    perform check here to verify that SYSTEM time zones are the same on
    slave and master, but we can't rely on value of @@system_time_zone
    variable (it is time zone abbreviation) since it determined at start
    time and so could differ for slave and master even if they are really
    in the same system time zone. So we are omiting this check and just
    relying on documentation. Also according to Monty there are many users
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    who are using replication between servers in various time zones. Hence
    such check will broke everything for them. (And now everything will
    work for them because by default both their master and slave will have
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    'SYSTEM' time zone).
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    This check is only necessary for 4.x masters (and < 5.0.4 masters but
    those were alpha).
1564
  */
1565
  if (version == 4)
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  {
1567 1568 1569 1570
    master_res= NULL;
    if (!mysql_real_query(mysql, STRING_WITH_LEN("SELECT @@GLOBAL.TIME_ZONE")) &&
        (master_res= mysql_store_result(mysql)) &&
        (master_row= mysql_fetch_row(master_res)))
1571
    {
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      if (strcmp(master_row[0],
                 global_system_variables.time_zone->get_name()->ptr()))
      {
        errmsg= "The slave I/O thread stops because master and slave have \
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different values for the TIME_ZONE global variable. The values must \
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be equal for the Statement-format replication to work";
        err_code= ER_SLAVE_FATAL_ERROR;
        sprintf(err_buff, ER(err_code), errmsg);
        goto err;
      }
1582
    }
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    else if (check_io_slave_killed(mi->io_thd, mi, NULL))
      goto slave_killed_err;
1585
    else if (is_network_error(err_code= mysql_errno(mysql)))
1586
    {
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      mi->report(ERROR_LEVEL, err_code,
                 "Get master TIME_ZONE failed with error: %s",
                 mysql_error(mysql));
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      goto network_err;
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    }
    else if (err_code == ER_UNKNOWN_SYSTEM_VARIABLE)
    {
      /* We use ERROR_LEVEL to get the error logged to file */
      mi->report(ERROR_LEVEL, err_code,

                 "MySQL master doesn't have a TIME_ZONE variable. Note that"
                 "if your timezone is not same between master and slave, your "
                 "slave may get wrong data into timestamp columns");
    }
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    else
    {
      /* Fatal error */
      errmsg= "The slave I/O thread stops because a fatal error is encountered \
when it try to get the value of TIME_ZONE global variable from master.";
      sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
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      goto err;
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    }
    if (master_res)
    {
      mysql_free_result(master_res);
      master_res= NULL;
    }
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  }

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  if (mi->heartbeat_period != 0.0)
  {
    char llbuf[22];
    const char query_format[]= "SET @master_heartbeat_period= %s";
    char query[sizeof(query_format) - 2 + sizeof(llbuf)];
    /* 
       the period is an ulonglong of nano-secs. 
    */
    llstr((ulonglong) (mi->heartbeat_period*1000000000UL), llbuf);
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    sprintf(query, query_format, llbuf);
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    if (mysql_real_query(mysql, query, strlen(query))
        && !check_io_slave_killed(mi->io_thd, mi, NULL))
    {
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      errmsg= "The slave I/O thread stops because SET @master_heartbeat_period "
        "on master failed.";
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      err_code= ER_SLAVE_FATAL_ERROR;
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      sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
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      mysql_free_result(mysql_store_result(mysql));
      goto err;
    }
    mysql_free_result(mysql_store_result(mysql));
  }
 
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  /*
    Querying if master is capable to checksum and notifying it about own
    CRC-awareness. The master's side instant value of @@global.binlog_checksum 
    is stored in the dump thread's uservar area as well as cached locally
    to become known in consensus by master and slave.
  */
  DBUG_EXECUTE_IF("simulate_slave_unaware_checksum",
                  mi->checksum_alg_before_fd= BINLOG_CHECKSUM_ALG_OFF;
                  goto past_checksum;);
  {
    int rc;
    const char query[]= "SET @master_binlog_checksum= @@global.binlog_checksum";
    master_res= NULL;
    mi->checksum_alg_before_fd= BINLOG_CHECKSUM_ALG_UNDEF; //initially undefined
    /*
      @c checksum_alg_before_fd is queried from master in this block.
      If master is old checksum-unaware the value stays undefined.
      Once the first FD will be received its alg descriptor will replace
      the being queried one.
    */
    rc= mysql_real_query(mysql, query, strlen(query));
    if (rc != 0)
    {
      if (check_io_slave_killed(mi->io_thd, mi, NULL))
        goto slave_killed_err;

      if (mysql_errno(mysql) == ER_UNKNOWN_SYSTEM_VARIABLE)
      {
        // this is tolerable as OM -> NS is supported
        mi->report(WARNING_LEVEL, mysql_errno(mysql),
                   "Notifying master by %s failed with "
                   "error: %s", query, mysql_error(mysql));
      }
      else
      {
        if (is_network_error(mysql_errno(mysql)))
        {
          mi->report(WARNING_LEVEL, mysql_errno(mysql),
                     "Notifying master by %s failed with "
                     "error: %s", query, mysql_error(mysql));
          mysql_free_result(mysql_store_result(mysql));
          goto network_err;
        }
        else
        {
          errmsg= "The slave I/O thread stops because a fatal error is encountered "
            "when it tried to SET @master_binlog_checksum on master.";
          err_code= ER_SLAVE_FATAL_ERROR;
          sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
          mysql_free_result(mysql_store_result(mysql));
          goto err;
        }
      }
    }
    else
    {
      mysql_free_result(mysql_store_result(mysql));
      if (!mysql_real_query(mysql,
                            STRING_WITH_LEN("SELECT @master_binlog_checksum")) &&
          (master_res= mysql_store_result(mysql)) &&
          (master_row= mysql_fetch_row(master_res)) &&
          (master_row[0] != NULL))
      {
        mi->checksum_alg_before_fd= (uint8)
          find_type(master_row[0], &binlog_checksum_typelib, 1) - 1;
        // valid outcome is either of
        DBUG_ASSERT(mi->checksum_alg_before_fd == BINLOG_CHECKSUM_ALG_OFF ||
                    mi->checksum_alg_before_fd == BINLOG_CHECKSUM_ALG_CRC32);
      }
      else if (check_io_slave_killed(mi->io_thd, mi, NULL))
        goto slave_killed_err;
      else if (is_network_error(mysql_errno(mysql)))
      {
        mi->report(WARNING_LEVEL, mysql_errno(mysql),
                   "Get master BINLOG_CHECKSUM failed with error: %s", mysql_error(mysql));
        goto network_err;
      }
      else
      {
        errmsg= "The slave I/O thread stops because a fatal error is encountered "
          "when it tried to SELECT @master_binlog_checksum.";
        err_code= ER_SLAVE_FATAL_ERROR;
        sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
        mysql_free_result(mysql_store_result(mysql));
        goto err;
      }
    }
    if (master_res)
    {
      mysql_free_result(master_res);
      master_res= NULL;
    }
  }

#ifndef DBUG_OFF
past_checksum:
#endif
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1737

1738
  /*
1739
    Request the master to filter away events with the @@skip_replication flag
1740 1741
    set, if we are running with
    --replicate-events-marked-for-skip=FILTER_ON_MASTER.
1742
  */
1743
  if (opt_replicate_events_marked_for_skip == RPL_SKIP_FILTER_ON_MASTER)
1744
  {
1745
    if (mysql_real_query(mysql, STRING_WITH_LEN("SET skip_replication=1")))
1746 1747 1748 1749 1750
    {
      err_code= mysql_errno(mysql);
      if (is_network_error(err_code))
      {
        mi->report(ERROR_LEVEL, err_code,
1751
                   "Setting master-side filtering of @@skip_replication failed "
1752 1753 1754 1755 1756 1757 1758
                   "with error: %s", mysql_error(mysql));
        goto network_err;
      }
      else if (err_code == ER_UNKNOWN_SYSTEM_VARIABLE)
      {
        /*
          The master is older than the slave and does not support the
1759
          @@skip_replication feature.
1760
          This is not a problem, as such master will not generate events with
1761
          the @@skip_replication flag set in the first place. We will still
1762 1763
          do slave-side filtering of such events though, to handle the (rare)
          case of downgrading a master and receiving old events generated from
1764
          before the downgrade with the @@skip_replication flag set.
1765 1766
        */
        DBUG_PRINT("info", ("Old master does not support master-side filtering "
1767 1768 1769 1770 1771 1772 1773 1774 1775 1776
                            "of @@skip_replication events."));
      }
      else
      {
        /* Fatal error */
        errmsg= "The slave I/O thread stops because a fatal error is "
          "encountered when it tries to request filtering of events marked "
          "with the @@skip_replication flag.";
        sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
        goto err;
1777 1778 1779
      }
    }
  }
1780 1781 1782 1783

  /* Announce MariaDB slave capabilities. */
  DBUG_EXECUTE_IF("simulate_slave_capability_none", goto after_set_capability;);
  {
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    int rc= DBUG_EVALUATE_IF("simulate_slave_capability_old_53",
        mysql_real_query(mysql, STRING_WITH_LEN("SET @mariadb_slave_capability="
                         STRINGIFY_ARG(MARIA_SLAVE_CAPABILITY_ANNOTATE))),
        mysql_real_query(mysql, STRING_WITH_LEN("SET @mariadb_slave_capability="
                         STRINGIFY_ARG(MARIA_SLAVE_CAPABILITY_MINE))));
    if (rc)
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    {
      err_code= mysql_errno(mysql);
      if (is_network_error(err_code))
      {
        mi->report(ERROR_LEVEL, err_code,
                   "Setting @mariadb_slave_capability failed with error: %s",
                   mysql_error(mysql));
        goto network_err;
      }
      else
      {
        /* Fatal error */
        errmsg= "The slave I/O thread stops because a fatal error is "
          "encountered when it tries to set @mariadb_slave_capability.";
        sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
        goto err;
      }
    }
  }
1809
#ifndef DBUG_OFF
1810
after_set_capability:
1811
#endif
1812

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  /*
    Request dump start from slave replication GTID state.

    Only request GTID position the first time we connect after CHANGE MASTER
    or after starting both IO or SQL thread.
1818

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1819 1820 1821 1822
    Otherwise, if the IO thread was ahead of the SQL thread before the
    restart or reconnect, we might end up re-fetching and hence re-applying
    the same event(s) again.
  */
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1823
  if (mi->using_gtid != Master_info::USE_GTID_NO && !mi->master_log_name[0])
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  {
    int rc;
    char str_buf[256];
    String connect_state(str_buf, sizeof(str_buf), system_charset_info);
    connect_state.length(0);
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1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850
    /*
      Read the master @@GLOBAL.gtid_domain_id variable.
      This is mostly to check that master is GTID aware, but we could later
      perhaps use it to check that different multi-source masters are correctly
      configured with distinct domain_id.
    */
    if (mysql_real_query(mysql,
                         STRING_WITH_LEN("SELECT @@GLOBAL.gtid_domain_id")) ||
        !(master_res= mysql_store_result(mysql)) ||
        !(master_row= mysql_fetch_row(master_res)))
    {
      err_code= mysql_errno(mysql);
      errmsg= "The slave I/O thread stops because master does not support "
        "MariaDB global transaction id. A fatal error is encountered when "
        "it tries to SELECT @@GLOBAL.gtid_domain_id.";
      sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
      goto err;
    }
    mysql_free_result(master_res);
    master_res= NULL;

1851 1852
    connect_state.append(STRING_WITH_LEN("SET @slave_connect_state='"),
                         system_charset_info);
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    if (rpl_append_gtid_state(&connect_state,
                              mi->using_gtid ==
                                  Master_info::USE_GTID_CURRENT_POS))
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    {
      err_code= ER_OUTOFMEMORY;
      errmsg= "The slave I/O thread stops because a fatal out-of-memory "
        "error is encountered when it tries to compute @slave_connect_state.";
      sprintf(err_buff, "%s Error: Out of memory", errmsg);
      goto err;
    }
1863
    connect_state.append(STRING_WITH_LEN("'"), system_charset_info);
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1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884
    rc= mysql_real_query(mysql, connect_state.ptr(), connect_state.length());
    if (rc)
    {
      err_code= mysql_errno(mysql);
      if (is_network_error(err_code))
      {
        mi->report(ERROR_LEVEL, err_code,
                   "Setting @slave_connect_state failed with error: %s",
                   mysql_error(mysql));
        goto network_err;
      }
      else
      {
        /* Fatal error */
        errmsg= "The slave I/O thread stops because a fatal error is "
          "encountered when it tries to set @slave_connect_state.";
        sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
        goto err;
      }
    }
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1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921

    if (mi->rli.until_condition == Relay_log_info::UNTIL_GTID)
    {
      connect_state.length(0);
      connect_state.append(STRING_WITH_LEN("SET @slave_until_gtid='"),
                           system_charset_info);
      if (mi->rli.until_gtid_pos.append_to_string(&connect_state))
      {
        err_code= ER_OUTOFMEMORY;
        errmsg= "The slave I/O thread stops because a fatal out-of-memory "
          "error is encountered when it tries to compute @slave_until_gtid.";
        sprintf(err_buff, "%s Error: Out of memory", errmsg);
        goto err;
      }
      connect_state.append(STRING_WITH_LEN("'"), system_charset_info);

      rc= mysql_real_query(mysql, connect_state.ptr(), connect_state.length());
      if (rc)
      {
        err_code= mysql_errno(mysql);
        if (is_network_error(err_code))
        {
          mi->report(ERROR_LEVEL, err_code,
                     "Setting @slave_until_gtid failed with error: %s",
                     mysql_error(mysql));
          goto network_err;
        }
        else
        {
          /* Fatal error */
          errmsg= "The slave I/O thread stops because a fatal error is "
            "encountered when it tries to set @slave_until_gtid.";
          sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
          goto err;
        }
      }
    }
1922
  }
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1923
  if (mi->using_gtid == Master_info::USE_GTID_NO)
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1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947
  {
    /*
      If we are not using GTID to connect this time, then instead request
      the corresponding GTID position from the master, so that the user
      can reconnect the next time using MASTER_GTID_POS=AUTO.
    */
    char quote_buf[2*sizeof(mi->master_log_name)+1];
    char str_buf[28+2*sizeof(mi->master_log_name)+10];
    String query(str_buf, sizeof(str_buf), system_charset_info);
    query.length(0);

    query.append("SELECT binlog_gtid_pos('");
    escape_quotes_for_mysql(&my_charset_bin, quote_buf, sizeof(quote_buf),
                            mi->master_log_name, strlen(mi->master_log_name));
    query.append(quote_buf);
    query.append("',");
    query.append_ulonglong(mi->master_log_pos);
    query.append(")");

    if (!mysql_real_query(mysql, query.c_ptr_safe(), query.length()) &&
        (master_res= mysql_store_result(mysql)) &&
        (master_row= mysql_fetch_row(master_res)) &&
        (master_row[0] != NULL))
    {
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      rpl_global_gtid_slave_state.load(mi->io_thd, master_row[0],
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                                       strlen(master_row[0]), false, false);
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    }
    else if (check_io_slave_killed(mi->io_thd, mi, NULL))
      goto slave_killed_err;
    else if (is_network_error(mysql_errno(mysql)))
    {
      mi->report(WARNING_LEVEL, mysql_errno(mysql),
                 "Get master GTID position failed with error: %s", mysql_error(mysql));
      goto network_err;
    }
    else
    {
      /*
        ToDo: If the master does not have the binlog_gtid_pos() function, it
        just means that it is an old master with no GTID support, so we should
        do nothing.

        However, if binlog_gtid_pos() exists, but fails or returns NULL, then
        it means that the requested position is not valid. We could use this
        to catch attempts to replicate from within the middle of an event,
        avoiding strange failures or possible corruption.
      */
    }
    if (master_res)
    {
      mysql_free_result(master_res);
      master_res= NULL;
    }
  }
1978

1979
err:
1980 1981
  if (errmsg)
  {
1982 1983
    if (master_res)
      mysql_free_result(master_res);
1984
    DBUG_ASSERT(err_code != 0);
1985
    mi->report(ERROR_LEVEL, err_code, "%s", err_buff);
1986
    DBUG_RETURN(1);
1987
  }
1988

1989
  DBUG_RETURN(0);
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network_err:
  if (master_res)
    mysql_free_result(master_res);
  DBUG_RETURN(2);
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1996 1997 1998 1999
slave_killed_err:
  if (master_res)
    mysql_free_result(master_res);
  DBUG_RETURN(2);
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}
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2002

2003
static bool wait_for_relay_log_space(Relay_log_info* rli)
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{
2005
  bool slave_killed=0;
2006
  Master_info* mi = rli->mi;
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  const char *save_proc_info;
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  THD* thd = mi->io_thd;
  DBUG_ENTER("wait_for_relay_log_space");
2010

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  mysql_mutex_lock(&rli->log_space_lock);
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  save_proc_info= thd->enter_cond(&rli->log_space_cond,
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                                  &rli->log_space_lock,
                                  "\
2015
Waiting for the slave SQL thread to free enough relay log space");
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  while (rli->log_space_limit < rli->log_space_total &&
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         !(slave_killed=io_slave_killed(thd,mi)) &&
2018
         !rli->ignore_log_space_limit)
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    mysql_cond_wait(&rli->log_space_cond, &rli->log_space_lock);
2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060

  /* 
    Makes the IO thread read only one event at a time
    until the SQL thread is able to purge the relay 
    logs, freeing some space.

    Therefore, once the SQL thread processes this next 
    event, it goes to sleep (no more events in the queue),
    sets ignore_log_space_limit=true and wakes the IO thread. 
    However, this event may have been enough already for 
    the SQL thread to purge some log files, freeing 
    rli->log_space_total .

    This guarantees that the SQL and IO thread move
    forward only one event at a time (to avoid deadlocks), 
    when the relay space limit is reached. It also 
    guarantees that when the SQL thread is prepared to
    rotate (to be able to purge some logs), the IO thread
    will know about it and will rotate.

    NOTE: The ignore_log_space_limit is only set when the SQL
          thread sleeps waiting for events.

   */
  if (rli->ignore_log_space_limit)
  {
#ifndef DBUG_OFF
    {
      char llbuf1[22], llbuf2[22];
      DBUG_PRINT("info", ("log_space_limit=%s "
                          "log_space_total=%s "
                          "ignore_log_space_limit=%d "
                          "sql_force_rotate_relay=%d", 
                        llstr(rli->log_space_limit,llbuf1),
                        llstr(rli->log_space_total,llbuf2),
                        (int) rli->ignore_log_space_limit,
                        (int) rli->sql_force_rotate_relay));
    }
#endif
    if (rli->sql_force_rotate_relay)
    {
2061
      mysql_mutex_lock(&mi->data_lock);
2062
      rotate_relay_log(rli->mi);
2063
      mysql_mutex_unlock(&mi->data_lock);
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      rli->sql_force_rotate_relay= false;
    }

    rli->ignore_log_space_limit= false;
  }

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  thd->exit_cond(save_proc_info);
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  DBUG_RETURN(slave_killed);
}
2073

2074

2075 2076
/*
  Builds a Rotate from the ignored events' info and writes it to relay log.
2077

2078 2079 2080 2081 2082 2083 2084 2085 2086 2087
  SYNOPSIS
  write_ignored_events_info_to_relay_log()
    thd             pointer to I/O thread's thd
    mi

  DESCRIPTION
    Slave I/O thread, going to die, must leave a durable trace of the
    ignored events' end position for the use of the slave SQL thread, by
    calling this function. Only that thread can call it (see assertion).
 */
2088
static void write_ignored_events_info_to_relay_log(THD *thd, Master_info *mi)
2089
{
2090
  Relay_log_info *rli= &mi->rli;
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  mysql_mutex_t *log_lock= rli->relay_log.get_log_lock();
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  DBUG_ENTER("write_ignored_events_info_to_relay_log");

2094
  DBUG_ASSERT(thd == mi->io_thd);
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2095
  mysql_mutex_lock(log_lock);
2096
  if (rli->ign_master_log_name_end[0])
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  {
2098
    DBUG_PRINT("info",("writing a Rotate event to track down ignored events"));
2099
    Rotate_log_event *ev= new Rotate_log_event(rli->ign_master_log_name_end,
2100 2101 2102 2103
                                               0, rli->ign_master_log_pos_end,
                                               Rotate_log_event::DUP_NAME);
    rli->ign_master_log_name_end[0]= 0;
    /* can unlock before writing as slave SQL thd will soon see our Rotate */
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2104
    mysql_mutex_unlock(log_lock);
2105 2106 2107 2108
    if (likely((bool)ev))
    {
      ev->server_id= 0; // don't be ignored by slave SQL thread
      if (unlikely(rli->relay_log.append(ev)))
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        mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE,
                   ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
                   "failed to write a Rotate event"
                   " to the relay log, SHOW SLAVE STATUS may be"
                   " inaccurate");
2114
      rli->relay_log.harvest_bytes_written(&rli->log_space_total);
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      if (flush_master_info(mi, TRUE, TRUE))
2116
        sql_print_error("Failed to flush master info file");
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      delete ev;
    }
    else
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      mi->report(ERROR_LEVEL, ER_SLAVE_CREATE_EVENT_FAILURE,
                 ER(ER_SLAVE_CREATE_EVENT_FAILURE),
                 "Rotate_event (out of memory?),"
                 " SHOW SLAVE STATUS may be inaccurate");
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  }
2125
  else
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2126
    mysql_mutex_unlock(log_lock);
2127
  DBUG_VOID_RETURN;
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}

2130

2131
int register_slave_on_master(MYSQL* mysql, Master_info *mi,
2132
                             bool *suppress_warnings)
2133
{
2134
  uchar buf[1024], *pos= buf;
2135
  uint report_host_len=0, report_user_len=0, report_password_len=0;
2136
  DBUG_ENTER("register_slave_on_master");
2137

2138
  *suppress_warnings= FALSE;
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  if (report_host)
    report_host_len= strlen(report_host);
  if (report_host_len > HOSTNAME_LENGTH)
  {
    sql_print_warning("The length of report_host is %d. "
                      "It is larger than the max length(%d), so this "
                      "slave cannot be registered to the master.",
                      report_host_len, HOSTNAME_LENGTH);
2147
    DBUG_RETURN(0);
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  }

2150
  if (report_user)
2151
    report_user_len= strlen(report_user);
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  if (report_user_len > USERNAME_LENGTH)
  {
    sql_print_warning("The length of report_user is %d. "
                      "It is larger than the max length(%d), so this "
                      "slave cannot be registered to the master.",
                      report_user_len, USERNAME_LENGTH);
    DBUG_RETURN(0);
  }

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2161
  if (report_password)
2162
    report_password_len= strlen(report_password);
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  if (report_password_len > MAX_PASSWORD_LENGTH)
  {
    sql_print_warning("The length of report_password is %d. "
                      "It is larger than the max length(%d), so this "
                      "slave cannot be registered to the master.",
                      report_password_len, MAX_PASSWORD_LENGTH);
    DBUG_RETURN(0);
  }
2171

2172
  int4store(pos, global_system_variables.server_id); pos+= 4;
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  pos= net_store_data(pos, (uchar*) report_host, report_host_len);
  pos= net_store_data(pos, (uchar*) report_user, report_user_len);
  pos= net_store_data(pos, (uchar*) report_password, report_password_len);
2176
  int2store(pos, (uint16) report_port); pos+= 2;
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  /* 
    Fake rpl_recovery_rank, which was removed in BUG#13963,
    so that this server can register itself on old servers,
    see BUG#49259.
   */
  int4store(pos, /* rpl_recovery_rank */ 0);    pos+= 4;
2183
  /* The master will fill in master_id */
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  int4store(pos, 0);                    pos+= 4;
2185

2186
  if (simple_command(mysql, COM_REGISTER_SLAVE, buf, (size_t) (pos- buf), 0))
2187
  {
2188 2189 2190 2191
    if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
    {
      *suppress_warnings= TRUE;                 // Suppress reconnect warning
    }
2192
    else if (!check_io_slave_killed(mi->io_thd, mi, NULL))
2193 2194 2195 2196 2197 2198 2199
    {
      char buf[256];
      my_snprintf(buf, sizeof(buf), "%s (Errno: %d)", mysql_error(mysql), 
                  mysql_errno(mysql));
      mi->report(ERROR_LEVEL, ER_SLAVE_MASTER_COM_FAILURE,
                 ER(ER_SLAVE_MASTER_COM_FAILURE), "COM_REGISTER_SLAVE", buf);
    }
2200
    DBUG_RETURN(1);
2201
  }
2202
  DBUG_RETURN(0);
2203 2204
}

2205

2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216
/**
  Execute a SHOW SLAVE STATUS statement.

  @param thd Pointer to THD object for the client thread executing the
  statement.

  @param mi Pointer to Master_info object for the IO thread.

  @retval FALSE success
  @retval TRUE failure
*/
2217 2218 2219 2220

bool show_master_info(THD *thd, Master_info *mi, bool full)
{
  DBUG_ENTER("show_master_info");
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  String gtid_pos;
2222

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  if (full && rpl_global_gtid_slave_state.tostring(&gtid_pos, NULL, 0))
2224
    DBUG_RETURN(TRUE);
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  if (send_show_master_info_header(thd, full, gtid_pos.length()))
    DBUG_RETURN(TRUE);
  if (send_show_master_info_data(thd, mi, full, &gtid_pos))
2228 2229 2230 2231 2232
    DBUG_RETURN(TRUE);
  my_eof(thd);
  DBUG_RETURN(FALSE);
}

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static bool send_show_master_info_header(THD *thd, bool full,
                                         size_t gtid_pos_length)
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{
  List<Item> field_list;
2237
  Protocol *protocol= thd->protocol;
2238
  Master_info *mi;
2239 2240 2241
  DBUG_ENTER("show_master_info_header");

  if (full)
2242
  {
2243 2244
    field_list.push_back(new Item_empty_string("Connection_name",
                                               MAX_CONNECTION_NAME));
2245 2246 2247
    field_list.push_back(new Item_empty_string("Slave_SQL_State",
                                               30));
  }
2248

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  field_list.push_back(new Item_empty_string("Slave_IO_State",
2250
                                                     30));
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  field_list.push_back(new Item_empty_string("Master_Host",
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                                                     sizeof(mi->host)));
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  field_list.push_back(new Item_empty_string("Master_User",
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                                                     sizeof(mi->user)));
2255
  field_list.push_back(new Item_return_int("Master_Port", 7,
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                                           MYSQL_TYPE_LONG));
2257
  field_list.push_back(new Item_return_int("Connect_Retry", 10,
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                                           MYSQL_TYPE_LONG));
2259
  field_list.push_back(new Item_empty_string("Master_Log_File",
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                                             FN_REFLEN));
2261
  field_list.push_back(new Item_return_int("Read_Master_Log_Pos", 10,
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                                           MYSQL_TYPE_LONGLONG));
2263
  field_list.push_back(new Item_empty_string("Relay_Log_File",
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                                             FN_REFLEN));
2265
  field_list.push_back(new Item_return_int("Relay_Log_Pos", 10,
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                                           MYSQL_TYPE_LONGLONG));
2267
  field_list.push_back(new Item_empty_string("Relay_Master_Log_File",
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                                             FN_REFLEN));
2269 2270
  field_list.push_back(new Item_empty_string("Slave_IO_Running", 3));
  field_list.push_back(new Item_empty_string("Slave_SQL_Running", 3));
2271 2272 2273 2274 2275 2276
  field_list.push_back(new Item_empty_string("Replicate_Do_DB", 20));
  field_list.push_back(new Item_empty_string("Replicate_Ignore_DB", 20));
  field_list.push_back(new Item_empty_string("Replicate_Do_Table", 20));
  field_list.push_back(new Item_empty_string("Replicate_Ignore_Table", 23));
  field_list.push_back(new Item_empty_string("Replicate_Wild_Do_Table", 24));
  field_list.push_back(new Item_empty_string("Replicate_Wild_Ignore_Table",
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                                             28));
2278 2279 2280
  field_list.push_back(new Item_return_int("Last_Errno", 4, MYSQL_TYPE_LONG));
  field_list.push_back(new Item_empty_string("Last_Error", 20));
  field_list.push_back(new Item_return_int("Skip_Counter", 10,
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                                           MYSQL_TYPE_LONG));
2282
  field_list.push_back(new Item_return_int("Exec_Master_Log_Pos", 10,
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                                           MYSQL_TYPE_LONGLONG));
2284
  field_list.push_back(new Item_return_int("Relay_Log_Space", 10,
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                                           MYSQL_TYPE_LONGLONG));
2286
  field_list.push_back(new Item_empty_string("Until_Condition", 6));
2287
  field_list.push_back(new Item_empty_string("Until_Log_File", FN_REFLEN));
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  field_list.push_back(new Item_return_int("Until_Log_Pos", 10,
2289
                                           MYSQL_TYPE_LONGLONG));
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  field_list.push_back(new Item_empty_string("Master_SSL_Allowed", 7));
  field_list.push_back(new Item_empty_string("Master_SSL_CA_File",
                                             sizeof(mi->ssl_ca)));
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  field_list.push_back(new Item_empty_string("Master_SSL_CA_Path",
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                                             sizeof(mi->ssl_capath)));
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  field_list.push_back(new Item_empty_string("Master_SSL_Cert",
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                                             sizeof(mi->ssl_cert)));
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  field_list.push_back(new Item_empty_string("Master_SSL_Cipher",
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                                             sizeof(mi->ssl_cipher)));
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  field_list.push_back(new Item_empty_string("Master_SSL_Key",
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                                             sizeof(mi->ssl_key)));
2301
  field_list.push_back(new Item_return_int("Seconds_Behind_Master", 10,
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                                           MYSQL_TYPE_LONGLONG));
2303 2304
  field_list.push_back(new Item_empty_string("Master_SSL_Verify_Server_Cert",
                                             3));
2305 2306 2307 2308
  field_list.push_back(new Item_return_int("Last_IO_Errno", 4, MYSQL_TYPE_LONG));
  field_list.push_back(new Item_empty_string("Last_IO_Error", 20));
  field_list.push_back(new Item_return_int("Last_SQL_Errno", 4, MYSQL_TYPE_LONG));
  field_list.push_back(new Item_empty_string("Last_SQL_Error", 20));
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2309 2310 2311 2312
  field_list.push_back(new Item_empty_string("Replicate_Ignore_Server_Ids",
                                             FN_REFLEN));
  field_list.push_back(new Item_return_int("Master_Server_Id", sizeof(ulong),
                                           MYSQL_TYPE_LONG));
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  field_list.push_back(new Item_empty_string("Using_Gtid",
                                             sizeof("Current_Pos")-1));
2315 2316 2317 2318 2319 2320 2321 2322
  if (full)
  {
    field_list.push_back(new Item_return_int("Retried_transactions",
                                             10, MYSQL_TYPE_LONG));
    field_list.push_back(new Item_return_int("Max_relay_log_size",
                                             10, MYSQL_TYPE_LONGLONG));
    field_list.push_back(new Item_return_int("Executed_log_entries",
                                             10, MYSQL_TYPE_LONG));
2323 2324 2325 2326
    field_list.push_back(new Item_return_int("Slave_received_heartbeats",
                                             10, MYSQL_TYPE_LONG));
    field_list.push_back(new Item_float("Slave_heartbeat_period",
                                        0.0, 3, 10));
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    field_list.push_back(new Item_empty_string("Gtid_Slave_Pos",
                                               gtid_pos_length));
2329
  }
2330
  if (protocol->send_result_set_metadata(&field_list,
2331
                            Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
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2332
    DBUG_RETURN(TRUE);
2333 2334 2335 2336
  DBUG_RETURN(FALSE);
}


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2337 2338
static bool send_show_master_info_data(THD *thd, Master_info *mi, bool full,
                                       String *gtid_pos)
2339 2340
{
  DBUG_ENTER("send_show_master_info_data");
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2341

2342 2343
  if (mi->host[0])
  {
2344
    DBUG_PRINT("info",("host is set: '%s'", mi->host));
2345
    String *packet= &thd->packet;
2346
    Protocol *protocol= thd->protocol;
2347
    Rpl_filter *rpl_filter= mi->rpl_filter;
2348 2349
    char buf[256];
    String tmp(buf, sizeof(buf), &my_charset_bin);
2350

2351
    protocol->prepare_for_resend();
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2352

2353
    /*
2354 2355
      slave_running can be accessed without run_lock but not other
      non-volotile members like mi->io_thd, which is guarded by the mutex.
2356
    */
2357 2358 2359
    if (full)
      protocol->store(mi->connection_name.str, mi->connection_name.length,
                      &my_charset_bin);
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2360
    mysql_mutex_lock(&mi->run_lock);
2361 2362 2363
    if (full)
      protocol->store(mi->rli.sql_thd ? mi->rli.sql_thd->proc_info : "",
                      &my_charset_bin);
2364
    protocol->store(mi->io_thd ? mi->io_thd->proc_info : "", &my_charset_bin);
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2365
    mysql_mutex_unlock(&mi->run_lock);
2366

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2367 2368 2369 2370
    mysql_mutex_lock(&mi->data_lock);
    mysql_mutex_lock(&mi->rli.data_lock);
    mysql_mutex_lock(&mi->err_lock);
    mysql_mutex_lock(&mi->rli.err_lock);
2371 2372
    protocol->store(mi->host, &my_charset_bin);
    protocol->store(mi->user, &my_charset_bin);
2373 2374
    protocol->store((uint32) mi->port);
    protocol->store((uint32) mi->connect_retry);
2375
    protocol->store(mi->master_log_name, &my_charset_bin);
2376
    protocol->store((ulonglong) mi->master_log_pos);
2377
    protocol->store(mi->rli.group_relay_log_name +
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2378 2379
                    dirname_length(mi->rli.group_relay_log_name),
                    &my_charset_bin);
2380 2381
    protocol->store((ulonglong) mi->rli.group_relay_log_pos);
    protocol->store(mi->rli.group_master_log_name, &my_charset_bin);
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    protocol->store(mi->slave_running == MYSQL_SLAVE_RUN_CONNECT ?
2383 2384
                    "Yes" : (mi->slave_running == MYSQL_SLAVE_RUN_NOT_CONNECT ?
                             "Connecting" : "No"), &my_charset_bin);
2385
    protocol->store(mi->rli.slave_running ? "Yes":"No", &my_charset_bin);
2386 2387 2388 2389
    protocol->store(rpl_filter->get_do_db());
    protocol->store(rpl_filter->get_ignore_db());

    rpl_filter->get_do_table(&tmp);
2390
    protocol->store(&tmp);
2391
    rpl_filter->get_ignore_table(&tmp);
2392
    protocol->store(&tmp);
2393
    rpl_filter->get_wild_do_table(&tmp);
2394
    protocol->store(&tmp);
2395
    rpl_filter->get_wild_ignore_table(&tmp);
2396 2397
    protocol->store(&tmp);

2398 2399
    protocol->store(mi->rli.last_error().number);
    protocol->store(mi->rli.last_error().message, &my_charset_bin);
2400
    protocol->store((uint32) mi->rli.slave_skip_counter);
2401
    protocol->store((ulonglong) mi->rli.group_master_log_pos);
2402
    protocol->store((ulonglong) mi->rli.log_space_total);
2403 2404

    protocol->store(
2405 2406
      mi->rli.until_condition==Relay_log_info::UNTIL_NONE ? "None":
        ( mi->rli.until_condition==Relay_log_info::UNTIL_MASTER_POS? "Master":
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2407 2408
          ( mi->rli.until_condition==Relay_log_info::UNTIL_RELAY_POS? "Relay":
            "Gtid")), &my_charset_bin);
2409 2410
    protocol->store(mi->rli.until_log_name, &my_charset_bin);
    protocol->store((ulonglong) mi->rli.until_log_pos);
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2411 2412

#ifdef HAVE_OPENSSL
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    protocol->store(mi->ssl? "Yes":"No", &my_charset_bin);
#else
    protocol->store(mi->ssl? "Ignored":"No", &my_charset_bin);
#endif
    protocol->store(mi->ssl_ca, &my_charset_bin);
    protocol->store(mi->ssl_capath, &my_charset_bin);
    protocol->store(mi->ssl_cert, &my_charset_bin);
    protocol->store(mi->ssl_cipher, &my_charset_bin);
    protocol->store(mi->ssl_key, &my_charset_bin);
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2423 2424 2425 2426 2427 2428
    /*
      Seconds_Behind_Master: if SQL thread is running and I/O thread is
      connected, we can compute it otherwise show NULL (i.e. unknown).
    */
    if ((mi->slave_running == MYSQL_SLAVE_RUN_CONNECT) &&
        mi->rli.slave_running)
2429
    {
2430
      long time_diff= ((long)(time(0) - mi->rli.last_master_timestamp)
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2431
                       - mi->clock_diff_with_master);
2432
      /*
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2433 2434
        Apparently on some systems time_diff can be <0. Here are possible
        reasons related to MySQL:
2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446
        - the master is itself a slave of another master whose time is ahead.
        - somebody used an explicit SET TIMESTAMP on the master.
        Possible reason related to granularity-to-second of time functions
        (nothing to do with MySQL), which can explain a value of -1:
        assume the master's and slave's time are perfectly synchronized, and
        that at slave's connection time, when the master's timestamp is read,
        it is at the very end of second 1, and (a very short time later) when
        the slave's timestamp is read it is at the very beginning of second
        2. Then the recorded value for master is 1 and the recorded value for
        slave is 2. At SHOW SLAVE STATUS time, assume that the difference
        between timestamp of slave and rli->last_master_timestamp is 0
        (i.e. they are in the same second), then we get 0-(2-1)=-1 as a result.
2447 2448 2449 2450
        This confuses users, so we don't go below 0: hence the max().

        last_master_timestamp == 0 (an "impossible" timestamp 1970) is a
        special marker to say "consider we have caught up".
2451
      */
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2452 2453
      protocol->store((longlong)(mi->rli.last_master_timestamp ?
                                 max(0, time_diff) : 0));
2454
    }
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2455
    else
2456
    {
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2457
      protocol->store_null();
2458 2459
    }
    protocol->store(mi->ssl_verify_server_cert? "Yes":"No", &my_charset_bin);
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2460

2461
    // Last_IO_Errno
2462
    protocol->store(mi->last_error().number);
2463
    // Last_IO_Error
2464
    protocol->store(mi->last_error().message, &my_charset_bin);
2465
    // Last_SQL_Errno
2466
    protocol->store(mi->rli.last_error().number);
2467
    // Last_SQL_Error
2468
    protocol->store(mi->rli.last_error().message, &my_charset_bin);
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2469 2470 2471 2472 2473 2474 2475 2476 2477 2478
    // Replicate_Ignore_Server_Ids
    {
      char buff[FN_REFLEN];
      ulong i, cur_len;
      for (i= 0, buff[0]= 0, cur_len= 0;
           i < mi->ignore_server_ids.elements; i++)
      {
        ulong s_id, slen;
        char sbuff[FN_REFLEN];
        get_dynamic(&mi->ignore_server_ids, (uchar*) &s_id, i);
2479
        slen= sprintf(sbuff, (i==0? "%lu" : ", %lu"), s_id);
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2480 2481 2482 2483 2484 2485
        if (cur_len + slen + 4 > FN_REFLEN)
        {
          /*
            break the loop whenever remained space could not fit
            ellipses on the next cycle
          */
2486
          sprintf(buff + cur_len, "...");
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2487 2488
          break;
        }
2489
        cur_len += sprintf(buff + cur_len, "%s", sbuff);
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2490 2491 2492 2493 2494
      }
      protocol->store(buff, &my_charset_bin);
    }
    // Master_Server_id
    protocol->store((uint32) mi->master_id);
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2495 2496 2497 2498
    protocol->store((mi->using_gtid==Master_info::USE_GTID_NO ? "No" :
                     (mi->using_gtid==Master_info::USE_GTID_SLAVE_POS ?
                      "Slave_Pos" : "Current_Pos")),
                    &my_charset_bin);
2499 2500 2501 2502 2503
    if (full)
    {
      protocol->store((uint32)    mi->rli.retried_trans);
      protocol->store((ulonglong) mi->rli.max_relay_log_size);
      protocol->store((uint32)    mi->rli.executed_entries);
2504 2505
      protocol->store((uint32)    mi->received_heartbeats);
      protocol->store((double)    mi->heartbeat_period, 3, &tmp);
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      protocol->store(gtid_pos->ptr(), gtid_pos->length(), &my_charset_bin);
2507
    }
2508

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2509 2510 2511 2512
    mysql_mutex_unlock(&mi->rli.err_lock);
    mysql_mutex_unlock(&mi->err_lock);
    mysql_mutex_unlock(&mi->rli.data_lock);
    mysql_mutex_unlock(&mi->data_lock);
2513

2514
    if (my_net_write(&thd->net, (uchar*) thd->packet.ptr(), packet->length()))
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      DBUG_RETURN(TRUE);
2516
  }
2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540
  DBUG_RETURN(FALSE);
}


/* Used to sort connections by name */

static int cmp_mi_by_name(const Master_info **arg1,
                          const Master_info **arg2)
{
  return my_strcasecmp(system_charset_info, (*arg1)->connection_name.str,
                       (*arg2)->connection_name.str);
}


/**
  Execute a SHOW FULL SLAVE STATUS statement.

  @param thd Pointer to THD object for the client thread executing the
  statement.

  Elements are sorted according to the original connection_name.

  @retval FALSE success
  @retval TRUE failure
2541 2542 2543

  @note
  master_info_index is protected by LOCK_active_mi.
2544 2545 2546 2547 2548
*/

bool show_all_master_info(THD* thd)
{
  uint i, elements;
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  String gtid_pos;
2550 2551
  Master_info **tmp;
  DBUG_ENTER("show_master_info");
2552
  mysql_mutex_assert_owner(&LOCK_active_mi);
2553

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  gtid_pos.length(0);
  if (rpl_append_gtid_state(&gtid_pos, true))
  {
    my_error(ER_OUT_OF_RESOURCES, MYF(0));
    DBUG_RETURN(TRUE);
  }
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2560 2561

  if (send_show_master_info_header(thd, 1, gtid_pos.length()))
2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582
    DBUG_RETURN(TRUE);

  if (!(elements= master_info_index->master_info_hash.records))
    goto end;

  /*
    Sort lines to get them into a predicted order
    (needed for test cases and to not confuse users)
  */
  if (!(tmp= (Master_info**) thd->alloc(sizeof(Master_info*) * elements)))
    DBUG_RETURN(TRUE);

  for (i= 0; i < elements; i++)
  {
    tmp[i]= (Master_info *) my_hash_element(&master_info_index->
                                            master_info_hash, i);
  }
  my_qsort(tmp, elements, sizeof(Master_info*), (qsort_cmp) cmp_mi_by_name);

  for (i= 0; i < elements; i++)
  {
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    if (send_show_master_info_data(thd, tmp[i], 1, &gtid_pos))
2584 2585 2586 2587
      DBUG_RETURN(TRUE);
  }

end:
2588
  my_eof(thd);
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  DBUG_RETURN(FALSE);
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}

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2593 2594
void set_slave_thread_options(THD* thd)
{
2595
  DBUG_ENTER("set_slave_thread_options");
2596 2597 2598 2599 2600 2601 2602 2603 2604
  /*
     It's nonsense to constrain the slave threads with max_join_size; if a
     query succeeded on master, we HAVE to execute it. So set
     OPTION_BIG_SELECTS. Setting max_join_size to HA_POS_ERROR is not enough
     (and it's not needed if we have OPTION_BIG_SELECTS) because an INSERT
     SELECT examining more than 4 billion rows would still fail (yes, because
     when max_join_size is 4G, OPTION_BIG_SELECTS is automatically set, but
     only for client threads.
  */
2605
  ulonglong options= thd->variables.option_bits | OPTION_BIG_SELECTS;
2606 2607 2608 2609
  if (opt_log_slave_updates)
    options|= OPTION_BIN_LOG;
  else
    options&= ~OPTION_BIN_LOG;
2610
  thd->variables.option_bits= options;
2611
  thd->variables.completion_type= 0;
2612
  DBUG_VOID_RETURN;
2613
}
2614

2615
void set_slave_thread_default_charset(THD* thd, Relay_log_info const *rli)
2616
{
2617 2618
  DBUG_ENTER("set_slave_thread_default_charset");

2619 2620 2621 2622 2623 2624 2625
  thd->variables.character_set_client=
    global_system_variables.character_set_client;
  thd->variables.collation_connection=
    global_system_variables.collation_connection;
  thd->variables.collation_server=
    global_system_variables.collation_server;
  thd->update_charset();
2626 2627 2628 2629 2630 2631 2632

  /*
    We use a const cast here since the conceptual (and externally
    visible) behavior of the function is to set the default charset of
    the thread.  That the cache has to be invalidated is a secondary
    effect.
   */
2633
  const_cast<Relay_log_info*>(rli)->cached_charset_invalidate();
2634
  DBUG_VOID_RETURN;
2635 2636
}

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/*
2638
  init_slave_thread()
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*/
2640

2641 2642
static int init_slave_thread(THD* thd, Master_info *mi,
                             SLAVE_THD_TYPE thd_type)
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{
  DBUG_ENTER("init_slave_thread");
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2645
  int simulate_error __attribute__((unused))= 0;
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  DBUG_EXECUTE_IF("simulate_io_slave_error_on_init",
                  simulate_error|= (1 << SLAVE_THD_IO););
  DBUG_EXECUTE_IF("simulate_sql_slave_error_on_init",
                  simulate_error|= (1 << SLAVE_THD_SQL););
  /* We must call store_globals() before doing my_net_init() */
  if (init_thr_lock() || thd->store_globals() ||
      my_net_init(&thd->net, 0, MYF(MY_THREAD_SPECIFIC)) ||
      IF_DBUG(simulate_error & (1<< thd_type), 0))
  {
    thd->cleanup();
    DBUG_RETURN(-1);
  }

2659
  thd->system_thread = (thd_type == SLAVE_THD_SQL) ?
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    SYSTEM_THREAD_SLAVE_SQL : SYSTEM_THREAD_SLAVE_IO;
2661
  thd->security_ctx->skip_grants();
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/*
  Adding MAX_LOG_EVENT_HEADER_LEN to the max_allowed_packet on all
  slave threads, since a replication event can become this much larger
  than the corresponding packet (query) sent from client to master.
*/
2667
  thd->variables.max_allowed_packet= slave_max_allowed_packet;
2668 2669
  thd->slave_thread= 1;
  thd->connection_name= mi->connection_name;
2670
  thd->enable_slow_log= opt_log_slow_slave_statements;
2671
  thd->variables.log_slow_filter= global_system_variables.log_slow_filter;
2672
  set_slave_thread_options(thd);
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  thd->client_capabilities = CLIENT_LOCAL_FILES;
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  mysql_mutex_lock(&LOCK_thread_count);
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  thd->thread_id= thd->variables.pseudo_thread_id= thread_id++;
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2676
  mysql_mutex_unlock(&LOCK_thread_count);
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2677

2678
  if (thd_type == SLAVE_THD_SQL)
2679
    thd_proc_info(thd, "Waiting for the next event in relay log");
2680
  else
2681
    thd_proc_info(thd, "Waiting for master update");
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  thd->set_time();
2683 2684
  /* Do not use user-supplied timeout value for system threads. */
  thd->variables.lock_wait_timeout= LONG_TIMEOUT;
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  DBUG_RETURN(0);
}

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/*
  Sleep for a given amount of time or until killed.

  @param thd        Thread context of the current thread.
  @param seconds    The number of seconds to sleep.
  @param func       Function object to check if the thread has been killed.
  @param info       The Rpl_info object associated with this sleep.
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  @retval True if the thread has been killed, false otherwise.
*/
template <typename killed_func, typename rpl_info>
static inline bool slave_sleep(THD *thd, time_t seconds,
                               killed_func func, rpl_info info)
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{
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  bool ret;
  struct timespec abstime;
  const char *old_proc_info;
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  mysql_mutex_t *lock= &info->sleep_lock;
  mysql_cond_t *cond= &info->sleep_cond;
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  /* Absolute system time at which the sleep time expires. */
  set_timespec(abstime, seconds);
  mysql_mutex_lock(lock);
  old_proc_info= thd->enter_cond(cond, lock, thd->proc_info);

  while (! (ret= func(thd, info)))
  {
    int error= mysql_cond_timedwait(cond, lock, &abstime);
    if (error == ETIMEDOUT || error == ETIME)
      break;
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  }
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  /* Implicitly unlocks the mutex. */
  thd->exit_cond(old_proc_info);
  return ret;
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}

2726

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static int request_dump(THD *thd, MYSQL* mysql, Master_info* mi,
			bool *suppress_warnings)
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{
2730
  uchar buf[FN_REFLEN + 10];
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  int len;
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  ushort binlog_flags = 0; // for now
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  char* logname = mi->master_log_name;
2734
  DBUG_ENTER("request_dump");
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  *suppress_warnings= FALSE;
2737

2738
  if (opt_log_slave_updates && opt_replicate_annotate_row_events)
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    binlog_flags|= BINLOG_SEND_ANNOTATE_ROWS_EVENT;

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  if (RUN_HOOK(binlog_relay_io,
               before_request_transmit,
               (thd, mi, binlog_flags)))
    DBUG_RETURN(1);
  
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  // TODO if big log files: Change next to int8store()
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  int4store(buf, (ulong) mi->master_log_pos);
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  int2store(buf + 4, binlog_flags);
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  int4store(buf + 6, global_system_variables.server_id);
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  len = (uint) strlen(logname);
2751
  memcpy(buf + 10, logname,len);
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  if (simple_command(mysql, COM_BINLOG_DUMP, buf, len + 10, 1))
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  {
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    /*
      Something went wrong, so we will just reconnect and retry later
      in the future, we should do a better error analysis, but for
      now we just fill up the error log :-)
    */
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SCRUM  
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2759
    if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
2760
      *suppress_warnings= TRUE;                 // Suppress reconnect warning
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    else
2762
      sql_print_error("Error on COM_BINLOG_DUMP: %d  %s, will retry in %d secs",
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                      mysql_errno(mysql), mysql_error(mysql),
2764
                      mi->connect_retry);
2765
    DBUG_RETURN(1);
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  }
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2768
  DBUG_RETURN(0);
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}

2771

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/*
2773
  Read one event from the master
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2774

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  SYNOPSIS
    read_event()
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    mysql               MySQL connection
    mi                  Master connection information
    suppress_warnings   TRUE when a normal net read timeout has caused us to
                        try a reconnect.  We do not want to print anything to
                        the error log in this case because this a anormal
                        event in an idle server.
2783

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    RETURN VALUES
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    'packet_error'      Error
    number              Length of packet
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*/

2789
static ulong read_event(MYSQL* mysql, Master_info *mi, bool* suppress_warnings)
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{
2791
  ulong len;
2792
  DBUG_ENTER("read_event");
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2794
  *suppress_warnings= FALSE;
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  /*
    my_real_read() will time us out
    We check if we were told to die, and if not, try reading again
  */
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#ifndef DBUG_OFF
2800
  if (disconnect_slave_event_count && !(mi->events_till_disconnect--))
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    DBUG_RETURN(packet_error);
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#endif
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2804
  len = cli_safe_read(mysql);
2805
  if (len == packet_error || (long) len < 1)
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  {
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SCRUM  
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    if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
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    {
      /*
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        We are trying a normal reconnect after a read timeout;
        we suppress prints to .err file as long as the reconnect
        happens without problems
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      */
      *suppress_warnings= TRUE;
    }
    else
2817
      sql_print_error("Error reading packet from server: %s ( server_errno=%d)",
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                      mysql_error(mysql), mysql_errno(mysql));
2819
    DBUG_RETURN(packet_error);
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2820 2821
  }

2822 2823
  /* Check if eof packet */
  if (len < 8 && mysql->net.read_pos[0] == 254)
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2824
  {
2825 2826
    sql_print_information("Slave: received end packet from server, apparent "
                          "master shutdown: %s",
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                     mysql_error(mysql));
2828
     DBUG_RETURN(packet_error);
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  }
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2830

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2831
  DBUG_PRINT("exit", ("len: %lu  net->read_pos[4]: %d",
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                      len, mysql->net.read_pos[4]));
  DBUG_RETURN(len - 1);
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}

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/*
  Check if the current error is of temporary nature of not.
  Some errors are temporary in nature, such as
  ER_LOCK_DEADLOCK and ER_LOCK_WAIT_TIMEOUT.  Ndb also signals
  that the error is temporary by pushing a warning with the error code
  ER_GET_TEMPORARY_ERRMSG, if the originating error is temporary.
*/
static int has_temporary_error(THD *thd)
{
2845 2846
  DBUG_ENTER("has_temporary_error");

2847
  DBUG_EXECUTE_IF("all_errors_are_temporary_errors",
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2848
                  if (thd->stmt_da->is_error())
2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860
                  {
                    thd->clear_error();
                    my_error(ER_LOCK_DEADLOCK, MYF(0));
                  });

  /*
    If there is no message in THD, we can't say if it's a temporary
    error or not. This is currently the case for Incident_log_event,
    which sets no message. Return FALSE.
  */
  if (!thd->is_error())
    DBUG_RETURN(0);
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2861 2862 2863 2864 2865 2866

  /*
    Temporary error codes:
    currently, InnoDB deadlock detected by InnoDB or lock
    wait timeout (innodb_lock_wait_timeout exceeded
  */
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Marc Alff committed
2867 2868
  if (thd->stmt_da->sql_errno() == ER_LOCK_DEADLOCK ||
      thd->stmt_da->sql_errno() == ER_LOCK_WAIT_TIMEOUT)
2869
    DBUG_RETURN(1);
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2870 2871 2872 2873 2874

#ifdef HAVE_NDB_BINLOG
  /*
    currently temporary error set in ndbcluster
  */
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2875
  List_iterator_fast<MYSQL_ERROR> it(thd->warning_info->warn_list());
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  MYSQL_ERROR *err;
  while ((err= it++))
  {
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    DBUG_PRINT("info", ("has condition %d %s", err->get_sql_errno(),
                        err->get_message_text()));
    switch (err->get_sql_errno())
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2882 2883
    {
    case ER_GET_TEMPORARY_ERRMSG:
2884
      DBUG_RETURN(1);
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    default:
      break;
    }
  }
#endif
2890
  DBUG_RETURN(0);
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2891
}
2892

2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919

/**
  Applies the given event and advances the relay log position.

  In essence, this function does:

  @code
    ev->apply_event(rli);
    ev->update_pos(rli);
  @endcode

  But it also does some maintainance, such as skipping events if
  needed and reporting errors.

  If the @c skip flag is set, then it is tested whether the event
  should be skipped, by looking at the slave_skip_counter and the
  server id.  The skip flag should be set when calling this from a
  replication thread but not set when executing an explicit BINLOG
  statement.

  @retval 0 OK.

  @retval 1 Error calling ev->apply_event().

  @retval 2 No error calling ev->apply_event(), but error calling
  ev->update_pos().
*/
2920
int apply_event_and_update_pos(Log_event* ev, THD* thd, Relay_log_info* rli)
2921 2922 2923 2924 2925 2926 2927 2928 2929
{
  int exec_res= 0;

  DBUG_ENTER("apply_event_and_update_pos");

  DBUG_PRINT("exec_event",("%s(type_code: %d; server_id: %d)",
                           ev->get_type_str(), ev->get_type_code(),
                           ev->server_id));
  DBUG_PRINT("info", ("thd->options: %s%s; rli->last_event_start_time: %lu",
2930 2931
                      FLAGSTR(thd->variables.option_bits, OPTION_NOT_AUTOCOMMIT),
                      FLAGSTR(thd->variables.option_bits, OPTION_BEGIN),
2932
                      (ulong) rli->last_event_start_time));
2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957

  /*
    Execute the event to change the database and update the binary
    log coordinates, but first we set some data that is needed for
    the thread.

    The event will be executed unless it is supposed to be skipped.

    Queries originating from this server must be skipped.  Low-level
    events (Format_description_log_event, Rotate_log_event,
    Stop_log_event) from this server must also be skipped. But for
    those we don't want to modify 'group_master_log_pos', because
    these events did not exist on the master.
    Format_description_log_event is not completely skipped.

    Skip queries specified by the user in 'slave_skip_counter'.  We
    can't however skip events that has something to do with the log
    files themselves.

    Filtering on own server id is extremely important, to ignore
    execution of events created by the creation/rotation of the relay
    log (remember that now the relay log starts with its Format_desc,
    has a Rotate etc).
  */

2958 2959
  /* Use the original server id for logging. */
  thd->variables.server_id = ev->server_id;
2960 2961 2962
  thd->set_time();                            // time the query
  thd->lex->current_select= 0;
  if (!ev->when)
2963 2964
  {
    my_hrtime_t hrtime= my_hrtime();
2965
    ev->when= hrtime_to_my_time(hrtime);
2966 2967
    ev->when_sec_part= hrtime_sec_part(hrtime);
  }
2968 2969
  thd->variables.option_bits=
    (thd->variables.option_bits & ~OPTION_SKIP_REPLICATION) |
2970
    (ev->flags & LOG_EVENT_SKIP_REPLICATION_F ? OPTION_SKIP_REPLICATION : 0);
2971 2972
  ev->thd = thd; // because up to this point, ev->thd == 0

2973 2974
  int reason= ev->shall_skip(rli);
  if (reason == Log_event::EVENT_SKIP_COUNT)
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  {
    DBUG_ASSERT(rli->slave_skip_counter > 0);
    rli->slave_skip_counter--;
  }
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2979
  mysql_mutex_unlock(&rli->data_lock);
2980 2981 2982
  if (reason == Log_event::EVENT_SKIP_NOT)
    exec_res= ev->apply_event(rli);

2983
#ifndef DBUG_OFF
2984 2985
  /*
    This only prints information to the debug trace.
2986

2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997
    TODO: Print an informational message to the error log?
  */
  static const char *const explain[] = {
    // EVENT_SKIP_NOT,
    "not skipped",
    // EVENT_SKIP_IGNORE,
    "skipped because event should be ignored",
    // EVENT_SKIP_COUNT
    "skipped because event skip counter was non-zero"
  };
  DBUG_PRINT("info", ("OPTION_BEGIN: %d; IN_STMT: %d",
2998
                      test(thd->variables.option_bits & OPTION_BEGIN),
2999 3000 3001
                      rli->get_flag(Relay_log_info::IN_STMT)));
  DBUG_PRINT("skip_event", ("%s event was %s",
                            ev->get_type_str(), explain[reason]));
3002 3003 3004 3005 3006 3007
#endif

  DBUG_PRINT("info", ("apply_event error = %d", exec_res));
  if (exec_res == 0)
  {
    int error= ev->update_pos(rli);
3008
#ifdef HAVE_valgrind
3009 3010 3011
    if (!rli->is_fake)
#endif
    {
3012
#ifndef DBUG_OFF
3013
      char buf[22];
3014
#endif
3015 3016 3017 3018 3019 3020 3021 3022
      DBUG_PRINT("info", ("update_pos error = %d", error));
      DBUG_PRINT("info", ("group %s %s",
                          llstr(rli->group_relay_log_pos, buf),
                          rli->group_relay_log_name));
      DBUG_PRINT("info", ("event %s %s",
                          llstr(rli->event_relay_log_pos, buf),
                          rli->event_relay_log_name));
    }
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    /*
      The update should not fail, so print an error message and
      return an error code.

      TODO: Replace this with a decent error message when merged
      with BUG#24954 (which adds several new error message).
    */
    if (error)
    {
3032
      char buf[22];
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      rli->report(ERROR_LEVEL, ER_UNKNOWN_ERROR,
                  "It was not possible to update the positions"
                  " of the relay log information: the slave may"
                  " be in an inconsistent state."
                  " Stopped in %s position %s",
                  rli->group_relay_log_name,
                  llstr(rli->group_relay_log_pos, buf));
      DBUG_RETURN(2);
    }
  }

  DBUG_RETURN(exec_res ? 1 : 0);
}


/**
  Top-level function for executing the next event from the relay log.

  This function reads the event from the relay log, executes it, and
  advances the relay log position.  It also handles errors, etc.

  This function may fail to apply the event for the following reasons:

   - The position specfied by the UNTIL condition of the START SLAVE
     command is reached.

   - It was not possible to read the event from the log.

   - The slave is killed.

   - An error occurred when applying the event, and the event has been
     tried slave_trans_retries times.  If the event has been retried
     fewer times, 0 is returned.

   - init_master_info or init_relay_log_pos failed. (These are called
3068
     if a failure occurs when applying the event.)
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   - An error occurred when updating the binlog position.

  @retval 0 The event was applied.

  @retval 1 The event was not applied.
*/
3076
static int exec_relay_log_event(THD* thd, Relay_log_info* rli)
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3077
{
3078 3079
  DBUG_ENTER("exec_relay_log_event");

3080 3081
  /*
     We acquire this mutex since we need it for all operations except
3082
     event execution. But we will release it in places where we will
3083 3084
     wait for something for example inside of next_event().
   */
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3085
  mysql_mutex_lock(&rli->data_lock);
3086

3087
  Log_event * ev = next_event(rli);
3088

3089
  DBUG_ASSERT(rli->sql_thd==thd);
3090

3091
  if (sql_slave_killed(thd,rli))
3092
  {
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    mysql_mutex_unlock(&rli->data_lock);
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    delete ev;
3095
    DBUG_RETURN(1);
3096
  }
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  if (ev)
  {
3099
    int exec_res;
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    /*
      This tests if the position of the beginning of the current event
      hits the UNTIL barrier.
    */
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    if ((rli->until_condition == Relay_log_info::UNTIL_MASTER_POS ||
         rli->until_condition == Relay_log_info::UNTIL_RELAY_POS) &&
3107
        rli->is_until_satisfied(thd, ev))
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    {
      char buf[22];
      sql_print_information("Slave SQL thread stopped because it reached its"
                            " UNTIL position %s", llstr(rli->until_pos(), buf));
      /*
        Setting abort_slave flag because we do not want additional message about
        error in query execution to be printed.
      */
      rli->abort_slave= 1;
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      mysql_mutex_unlock(&rli->data_lock);
3118
      delete ev;
3119
      DBUG_RETURN(1);
3120
    }
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    { /**
         The following failure injecion works in cooperation with tests 
         setting @@global.debug= 'd,incomplete_group_in_relay_log'.
         Xid or Commit events are not executed to force the slave sql
         read hanging if the realy log does not have any more events.
      */
      DBUG_EXECUTE_IF("incomplete_group_in_relay_log",
                      if ((ev->get_type_code() == XID_EVENT) ||
                          ((ev->get_type_code() == QUERY_EVENT) &&
                           strcmp("COMMIT", ((Query_log_event *) ev)->query) == 0))
                      {
                        DBUG_ASSERT(thd->transaction.all.modified_non_trans_table);
                        rli->abort_slave= 1;
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                        mysql_mutex_unlock(&rli->data_lock);
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                        delete ev;
                        rli->inc_event_relay_log_pos();
                        DBUG_RETURN(0);
                      };);
    }

3142
    exec_res= apply_event_and_update_pos(ev, thd, rli);
3143

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    switch (ev->get_type_code()) {
      case FORMAT_DESCRIPTION_EVENT:
        /*
          Format_description_log_event should not be deleted because it
          will be used to read info about the relay log's format;
          it will be deleted when the SQL thread does not need it,
          i.e. when this thread terminates.
        */
        break;
      case ANNOTATE_ROWS_EVENT:
        /*
          Annotate_rows event should not be deleted because after it has
          been applied, thd->query points to the string inside this event.
          The thd->query will be used to generate new Annotate_rows event
          during applying the subsequent Rows events.
        */
        rli->set_annotate_event((Annotate_rows_log_event*) ev);
        break;
      case DELETE_ROWS_EVENT:
      case UPDATE_ROWS_EVENT:
      case WRITE_ROWS_EVENT:
        /*
          After the last Rows event has been applied, the saved Annotate_rows
          event (if any) is not needed anymore and can be deleted.
        */
        if (((Rows_log_event*)ev)->get_flags(Rows_log_event::STMT_END_F))
          rli->free_annotate_event();
        /* fall through */
      default:
        DBUG_PRINT("info", ("Deleting the event after it has been executed"));
Sergei Golubchik's avatar
Sergei Golubchik committed
3174 3175
        if (!rli->is_deferred_event(ev))
          delete ev;
3176
        break;
3177 3178
    }

3179

3180
    /*
3181 3182
      update_log_pos failed: this should not happen, so we don't
      retry.
3183
    */
3184 3185 3186
    if (exec_res == 2)
      DBUG_RETURN(1);

3187 3188
    if (slave_trans_retries)
    {
3189
      int temp_err;
Michael Widenius's avatar
Michael Widenius committed
3190
      LINT_INIT(temp_err);
3191
      if (exec_res && (temp_err= has_temporary_error(thd)))
3192 3193 3194 3195
      {
        const char *errmsg;
        /*
          We were in a transaction which has been rolled back because of a
unknown's avatar
unknown committed
3196 3197
          temporary error;
          let's seek back to BEGIN log event and retry it all again.
3198
	  Note, if lock wait timeout (innodb_lock_wait_timeout exceeded)
3199
	  there is no rollback since 5.0.13 (ref: manual).
3200 3201 3202 3203 3204 3205 3206 3207
          We have to not only seek but also
          a) init_master_info(), to seek back to hot relay log's start for later
          (for when we will come back to this hot log after re-processing the
          possibly existing old logs where BEGIN is: check_binlog_magic() will
          then need the cache to be at position 0 (see comments at beginning of
          init_master_info()).
          b) init_relay_log_pos(), because the BEGIN may be an older relay log.
        */
3208
        if (rli->trans_retries < slave_trans_retries)
3209 3210 3211 3212 3213 3214
        {
          if (init_master_info(rli->mi, 0, 0, 0, SLAVE_SQL))
            sql_print_error("Failed to initialize the master info structure");
          else if (init_relay_log_pos(rli,
                                      rli->group_relay_log_name,
                                      rli->group_relay_log_pos,
3215
                                      1, &errmsg, 1))
3216 3217 3218 3219 3220
            sql_print_error("Error initializing relay log position: %s",
                            errmsg);
          else
          {
            exec_res= 0;
3221
            rli->cleanup_context(thd, 1);
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3222
            /* chance for concurrent connection to get more locks */
3223 3224
            slave_sleep(thd, min(rli->trans_retries, MAX_SLAVE_RETRY_PAUSE),
                       sql_slave_killed, rli);
Marc Alff's avatar
Marc Alff committed
3225
            mysql_mutex_lock(&rli->data_lock); // because of SHOW STATUS
unknown's avatar
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3226
            rli->trans_retries++;
3227
            rli->retried_trans++;
3228
            statistic_increment(slave_retried_transactions, LOCK_status);
Marc Alff's avatar
Marc Alff committed
3229
            mysql_mutex_unlock(&rli->data_lock);
3230 3231
            DBUG_PRINT("info", ("Slave retries transaction "
                                "rli->trans_retries: %lu", rli->trans_retries));
unknown's avatar
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3232
          }
3233 3234 3235 3236 3237 3238 3239
        }
        else
          sql_print_error("Slave SQL thread retried transaction %lu time(s) "
                          "in vain, giving up. Consider raising the value of "
                          "the slave_transaction_retries variable.",
                          slave_trans_retries);
      }
3240
      else if ((exec_res && !temp_err) ||
3241 3242
               (opt_using_transactions &&
                rli->group_relay_log_pos == rli->event_relay_log_pos))
3243 3244
      {
        /*
3245 3246 3247
          Only reset the retry counter if the entire group succeeded
          or failed with a non-transient error.  On a successful
          event, the execution will proceed as usual; in the case of a
3248 3249 3250
          non-transient error, the slave will stop with an error.
         */
        rli->trans_retries= 0; // restart from fresh
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3251
        DBUG_PRINT("info", ("Resetting retry counter, rli->trans_retries: %lu",
3252
                            rli->trans_retries));
3253
      }
3254 3255
    }
    DBUG_RETURN(exec_res);
3256
  }
Marc Alff's avatar
Marc Alff committed
3257
  mysql_mutex_unlock(&rli->data_lock);
3258 3259
  rli->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_READ_FAILURE,
              ER(ER_SLAVE_RELAY_LOG_READ_FAILURE), "\
3260 3261 3262 3263 3264 3265 3266
Could not parse relay log event entry. The possible reasons are: the master's \
binary log is corrupted (you can check this by running 'mysqlbinlog' on the \
binary log), the slave's relay log is corrupted (you can check this by running \
'mysqlbinlog' on the relay log), a network problem, or a bug in the master's \
or slave's MySQL code. If you want to check the master's binary log or slave's \
relay log, you will be able to know their names by issuing 'SHOW SLAVE STATUS' \
on this slave.\
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3267
");
3268
  DBUG_RETURN(1);
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3269 3270
}

3271

3272
static bool check_io_slave_killed(THD *thd, Master_info *mi, const char *info)
3273 3274 3275
{
  if (io_slave_killed(thd, mi))
  {
3276
    if (info && global_system_variables.log_warnings)
3277
      sql_print_information("%s", info);
3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308
    return TRUE;
  }
  return FALSE;
}

/**
  @brief Try to reconnect slave IO thread.

  @details Terminates current connection to master, sleeps for
  @c mi->connect_retry msecs and initiates new connection with
  @c safe_reconnect(). Variable pointed by @c retry_count is increased -
  if it exceeds @c master_retry_count then connection is not re-established
  and function signals error.
  Unless @c suppres_warnings is TRUE, a warning is put in the server error log
  when reconnecting. The warning message and messages used to report errors
  are taken from @c messages array. In case @c master_retry_count is exceeded,
  no messages are added to the log.

  @param[in]     thd                 Thread context.
  @param[in]     mysql               MySQL connection.
  @param[in]     mi                  Master connection information.
  @param[in,out] retry_count         Number of attempts to reconnect.
  @param[in]     suppress_warnings   TRUE when a normal net read timeout 
                                     has caused to reconnecting.
  @param[in]     messages            Messages to print/log, see 
                                     reconnect_messages[] array.

  @retval        0                   OK.
  @retval        1                   There was an error.
*/

3309
static int try_to_reconnect(THD *thd, MYSQL *mysql, Master_info *mi,
3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322
                            uint *retry_count, bool suppress_warnings,
                            const char *messages[SLAVE_RECON_MSG_MAX])
{
  mi->slave_running= MYSQL_SLAVE_RUN_NOT_CONNECT;
  thd->proc_info= messages[SLAVE_RECON_MSG_WAIT];
#ifdef SIGNAL_WITH_VIO_CLOSE  
  thd->clear_active_vio();
#endif
  end_server(mysql);
  if ((*retry_count)++)
  {
    if (*retry_count > master_retry_count)
      return 1;                             // Don't retry forever
3323
    slave_sleep(thd, mi->connect_retry, io_slave_killed, mi);
3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344
  }
  if (check_io_slave_killed(thd, mi, messages[SLAVE_RECON_MSG_KILLED_WAITING]))
    return 1;
  thd->proc_info = messages[SLAVE_RECON_MSG_AFTER];
  if (!suppress_warnings) 
  {
    char buf[256], llbuff[22];
    my_snprintf(buf, sizeof(buf), messages[SLAVE_RECON_MSG_FAILED], 
                IO_RPL_LOG_NAME, llstr(mi->master_log_pos, llbuff));
    /* 
      Raise a warining during registering on master/requesting dump.
      Log a message reading event.
    */
    if (messages[SLAVE_RECON_MSG_COMMAND][0])
    {
      mi->report(WARNING_LEVEL, ER_SLAVE_MASTER_COM_FAILURE,
                 ER(ER_SLAVE_MASTER_COM_FAILURE), 
                 messages[SLAVE_RECON_MSG_COMMAND], buf);
    }
    else
    {
3345
      sql_print_information("%s", buf);
3346 3347 3348 3349 3350
    }
  }
  if (safe_reconnect(thd, mysql, mi, 1) || io_slave_killed(thd, mi))
  {
    if (global_system_variables.log_warnings)
3351
      sql_print_information("%s", messages[SLAVE_RECON_MSG_KILLED_AFTER]);
3352 3353 3354 3355 3356 3357
    return 1;
  }
  return 0;
}


3358 3359 3360 3361 3362
/**
  Slave IO thread entry point.

  @param arg Pointer to Master_info struct that holds information for
  the IO thread.
3363

3364 3365
  @return Always 0.
*/
3366
pthread_handler_t handle_slave_io(void *arg)
unknown's avatar
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3367
{
unknown's avatar
unknown committed
3368 3369
  THD *thd; // needs to be first for thread_stack
  MYSQL *mysql;
3370
  Master_info *mi = (Master_info*)arg;
3371
  Relay_log_info *rli= &mi->rli;
unknown's avatar
unknown committed
3372 3373
  char llbuff[22];
  uint retry_count;
3374
  bool suppress_warnings;
3375
  int ret;
3376 3377 3378
#ifndef DBUG_OFF
  uint retry_count_reg= 0, retry_count_dump= 0, retry_count_event= 0;
#endif
unknown's avatar
unknown committed
3379 3380
  // needs to call my_thread_init(), otherwise we get a coredump in DBUG_ stuff
  my_thread_init();
3381
  DBUG_ENTER("handle_slave_io");
unknown's avatar
unknown committed
3382

3383
  DBUG_ASSERT(mi->inited);
unknown's avatar
unknown committed
3384 3385 3386
  mysql= NULL ;
  retry_count= 0;

3387 3388
  thd= new THD; // note that contructor of THD uses DBUG_ !

Marc Alff's avatar
Marc Alff committed
3389
  mysql_mutex_lock(&mi->run_lock);
unknown's avatar
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3390 3391 3392
  /* Inform waiting threads that slave has started */
  mi->slave_run_id++;

3393
#ifndef DBUG_OFF
3394
  mi->events_till_disconnect = disconnect_slave_event_count;
3395 3396
#endif

3397
  THD_CHECK_SENTRY(thd);
3398
  mi->io_thd = thd;
unknown's avatar
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3399 3400

  pthread_detach_this_thread();
3401
  thd->thread_stack= (char*) &thd; // remember where our stack is
3402
  mi->clear_error();
3403
  if (init_slave_thread(thd, mi, SLAVE_THD_IO))
unknown's avatar
unknown committed
3404
  {
Marc Alff's avatar
Marc Alff committed
3405
    mysql_cond_broadcast(&mi->start_cond);
unknown's avatar
unknown committed
3406
    sql_print_error("Failed during slave I/O thread initialization");
3407
    goto err_during_init;
unknown's avatar
unknown committed
3408
  }
Marc Alff's avatar
Marc Alff committed
3409
  mysql_mutex_lock(&LOCK_thread_count);
unknown's avatar
unknown committed
3410
  threads.append(thd);
Marc Alff's avatar
Marc Alff committed
3411
  mysql_mutex_unlock(&LOCK_thread_count);
3412
  mi->slave_running = MYSQL_SLAVE_RUN_NOT_CONNECT;
3413
  mi->abort_slave = 0;
Marc Alff's avatar
Marc Alff committed
3414 3415
  mysql_mutex_unlock(&mi->run_lock);
  mysql_cond_broadcast(&mi->start_cond);
3416

3417
  DBUG_PRINT("master_info",("log_file_name: '%s'  position: %s",
unknown's avatar
unknown committed
3418 3419
                            mi->master_log_name,
                            llstr(mi->master_log_pos,llbuff)));
3420

He Zhenxing's avatar
He Zhenxing committed
3421 3422 3423 3424 3425 3426 3427 3428 3429 3430
  /* This must be called before run any binlog_relay_io hooks */
  my_pthread_setspecific_ptr(RPL_MASTER_INFO, mi);

  if (RUN_HOOK(binlog_relay_io, thread_start, (thd, mi)))
  {
    mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
               ER(ER_SLAVE_FATAL_ERROR), "Failed to run 'thread_start' hook");
    goto err;
  }

unknown's avatar
SCRUM  
unknown committed
3431
  if (!(mi->mysql = mysql = mysql_init(NULL)))
unknown's avatar
unknown committed
3432
  {
3433 3434
    mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
               ER(ER_SLAVE_FATAL_ERROR), "error in mysql_init()");
unknown's avatar
unknown committed
3435 3436
    goto err;
  }
3437

3438
  thd_proc_info(thd, "Connecting to master");
3439
  // we can get killed during safe_connect
3440
  if (!safe_connect(thd, mysql, mi))
3441
  {
unknown's avatar
unknown committed
3442 3443 3444
    sql_print_information("Slave I/O thread: connected to master '%s@%s:%d',"
                          "replication started in log '%s' at position %s",
                          mi->user, mi->host, mi->port,
3445 3446
			  IO_RPL_LOG_NAME,
			  llstr(mi->master_log_pos,llbuff));
3447 3448 3449 3450 3451
  /*
    Adding MAX_LOG_EVENT_HEADER_LEN to the max_packet_size on the I/O
    thread, since a replication event can become this much larger than
    the corresponding packet (query) sent from client to master.
  */
3452
    thd->net.max_packet_size= slave_max_allowed_packet;
3453 3454
    mysql->net.max_packet_size= thd->net.max_packet_size+= MAX_LOG_EVENT_HEADER;
  }
3455
  else
unknown's avatar
unknown committed
3456
  {
3457
    sql_print_information("Slave I/O thread killed while connecting to master");
unknown's avatar
unknown committed
3458 3459
    goto err;
  }
3460

3461
connected:
3462

3463
#ifdef ENABLED_DEBUG_SYNC
3464 3465 3466 3467 3468
    DBUG_EXECUTE_IF("dbug.before_get_running_status_yes",
                    {
                      const char act[]=
                        "now "
                        "wait_for signal.io_thread_let_running";
3469
                      DBUG_ASSERT(debug_sync_service);
3470 3471 3472
                      DBUG_ASSERT(!debug_sync_set_action(thd, 
                                                         STRING_WITH_LEN(act)));
                    };);
3473
#endif
3474

3475 3476
  // TODO: the assignment below should be under mutex (5.0)
  mi->slave_running= MYSQL_SLAVE_RUN_CONNECT;
3477
  thd->slave_net = &mysql->net;
3478
  thd_proc_info(thd, "Checking master version");
3479 3480 3481
  ret= get_master_version_and_clock(mysql, mi);
  if (ret == 1)
    /* Fatal error */
3482
    goto err;
3483

3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495
  if (ret == 2) 
  { 
    if (check_io_slave_killed(mi->io_thd, mi, "Slave I/O thread killed"
                              "while calling get_master_version_and_clock(...)"))
      goto err;
    suppress_warnings= FALSE;
    /* Try to reconnect because the error was caused by a transient network problem */
    if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                             reconnect_messages[SLAVE_RECON_ACT_REG]))
      goto err;
    goto connected;
  } 
3496 3497

  if (mi->rli.relay_log.description_event_for_queue->binlog_version > 1)
3498
  {
unknown's avatar
unknown committed
3499 3500 3501
    /*
      Register ourselves with the master.
    */
3502
    thd_proc_info(thd, "Registering slave on master");
3503
    if (register_slave_on_master(mysql, mi, &suppress_warnings))
3504
    {
3505 3506 3507 3508 3509 3510 3511 3512 3513
      if (!check_io_slave_killed(thd, mi, "Slave I/O thread killed "
                                "while registering slave on master"))
      {
        sql_print_error("Slave I/O thread couldn't register on master");
        if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                             reconnect_messages[SLAVE_RECON_ACT_REG]))
          goto err;
      }
      else
3514 3515
        goto err;
      goto connected;
3516
    }
3517 3518 3519 3520 3521 3522 3523 3524 3525 3526
    DBUG_EXECUTE_IF("FORCE_SLAVE_TO_RECONNECT_REG", 
      if (!retry_count_reg)
      {
        retry_count_reg++;
        sql_print_information("Forcing to reconnect slave I/O thread");
        if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                             reconnect_messages[SLAVE_RECON_ACT_REG]))
          goto err;
        goto connected;
      });
3527
  }
3528

3529
  DBUG_PRINT("info",("Starting reading binary log from master"));
3530
  while (!io_slave_killed(thd,mi))
unknown's avatar
unknown committed
3531
  {
3532
    thd_proc_info(thd, "Requesting binlog dump");
He Zhenxing's avatar
He Zhenxing committed
3533
    if (request_dump(thd, mysql, mi, &suppress_warnings))
unknown's avatar
unknown committed
3534 3535
    {
      sql_print_error("Failed on request_dump()");
3536 3537 3538 3539
      if (check_io_slave_killed(thd, mi, "Slave I/O thread killed while \
requesting master dump") ||
          try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                           reconnect_messages[SLAVE_RECON_ACT_DUMP]))
unknown's avatar
unknown committed
3540
        goto err;
unknown's avatar
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3541 3542
      goto connected;
    }
3543 3544 3545 3546 3547 3548 3549 3550 3551 3552
    DBUG_EXECUTE_IF("FORCE_SLAVE_TO_RECONNECT_DUMP", 
      if (!retry_count_dump)
      {
        retry_count_dump++;
        sql_print_information("Forcing to reconnect slave I/O thread");
        if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                             reconnect_messages[SLAVE_RECON_ACT_DUMP]))
          goto err;
        goto connected;
      });
He Zhenxing's avatar
He Zhenxing committed
3553
    const char *event_buf;
unknown's avatar
unknown committed
3554

3555
    DBUG_ASSERT(mi->last_error().number == 0);
3556
    while (!io_slave_killed(thd,mi))
unknown's avatar
unknown committed
3557
    {
3558
      ulong event_len;
3559
      /*
3560
         We say "waiting" because read_event() will wait if there's nothing to
3561 3562 3563
         read. But if there's something to read, it will not wait. The
         important thing is to not confuse users by saying "reading" whereas
         we're in fact receiving nothing.
3564
      */
3565
      thd_proc_info(thd, "Waiting for master to send event");
3566
      event_len= read_event(mysql, mi, &suppress_warnings);
3567 3568
      if (check_io_slave_killed(thd, mi, "Slave I/O thread killed while \
reading event"))
unknown's avatar
unknown committed
3569
        goto err;
3570 3571 3572 3573 3574 3575 3576 3577 3578 3579
      DBUG_EXECUTE_IF("FORCE_SLAVE_TO_RECONNECT_EVENT",
        if (!retry_count_event)
        {
          retry_count_event++;
          sql_print_information("Forcing to reconnect slave I/O thread");
          if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                               reconnect_messages[SLAVE_RECON_ACT_EVENT]))
            goto err;
          goto connected;
        });
3580

unknown's avatar
unknown committed
3581 3582
      if (event_len == packet_error)
      {
unknown's avatar
unknown committed
3583
        uint mysql_error_number= mysql_errno(mysql);
3584 3585
        switch (mysql_error_number) {
        case CR_NET_PACKET_TOO_LARGE:
unknown's avatar
unknown committed
3586
          sql_print_error("\
3587
Log entry on master is longer than slave_max_allowed_packet (%lu) on \
3588
slave. If the entry is correct, restart the server with a higher value of \
3589 3590
slave_max_allowed_packet",
                         slave_max_allowed_packet);
3591
          mi->report(ERROR_LEVEL, ER_NET_PACKET_TOO_LARGE,
3592
                     "%s", "Got a packet bigger than 'slave_max_allowed_packet' bytes");
unknown's avatar
unknown committed
3593
          goto err;
3594
        case ER_MASTER_FATAL_ERROR_READING_BINLOG:
3595 3596 3597
          mi->report(ERROR_LEVEL, ER_MASTER_FATAL_ERROR_READING_BINLOG,
                     ER(ER_MASTER_FATAL_ERROR_READING_BINLOG),
                     mysql_error_number, mysql_error(mysql));
unknown's avatar
unknown committed
3598
          goto err;
3599
        case ER_OUT_OF_RESOURCES:
3600 3601
          sql_print_error("\
Stopping slave I/O thread due to out-of-memory error from master");
3602
          mi->report(ERROR_LEVEL, ER_OUT_OF_RESOURCES,
3603
                     "%s", ER(ER_OUT_OF_RESOURCES));
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unknown committed
3604 3605
          goto err;
        }
3606 3607
        if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                             reconnect_messages[SLAVE_RECON_ACT_EVENT]))
unknown's avatar
unknown committed
3608 3609
          goto err;
        goto connected;
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unknown committed
3610
      } // if (event_len == packet_error)
3611

unknown's avatar
unknown committed
3612
      retry_count=0;                    // ok event, reset retry counter
3613
      thd_proc_info(thd, "Queueing master event to the relay log");
He Zhenxing's avatar
He Zhenxing committed
3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628
      event_buf= (const char*)mysql->net.read_pos + 1;
      if (RUN_HOOK(binlog_relay_io, after_read_event,
                   (thd, mi,(const char*)mysql->net.read_pos + 1,
                    event_len, &event_buf, &event_len)))
      {
        mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
                   ER(ER_SLAVE_FATAL_ERROR),
                   "Failed to run 'after_read_event' hook");
        goto err;
      }

      /* XXX: 'synced' should be updated by queue_event to indicate
         whether event has been synced to disk */
      bool synced= 0;
      if (queue_event(mi, event_buf, event_len))
unknown's avatar
unknown committed
3629
      {
3630 3631 3632
        mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE,
                   ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
                   "could not queue event from master");
unknown's avatar
unknown committed
3633
        goto err;
unknown's avatar
unknown committed
3634
      }
He Zhenxing's avatar
He Zhenxing committed
3635 3636 3637 3638 3639 3640 3641 3642 3643 3644

      if (RUN_HOOK(binlog_relay_io, after_queue_event,
                   (thd, mi, event_buf, event_len, synced)))
      {
        mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
                   ER(ER_SLAVE_FATAL_ERROR),
                   "Failed to run 'after_queue_event' hook");
        goto err;
      }

3645
      if (flush_master_info(mi, TRUE, TRUE))
3646 3647 3648 3649
      {
        sql_print_error("Failed to flush master info file");
        goto err;
      }
3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661
      /*
        See if the relay logs take too much space.
        We don't lock mi->rli.log_space_lock here; this dirty read saves time
        and does not introduce any problem:
        - if mi->rli.ignore_log_space_limit is 1 but becomes 0 just after (so
        the clean value is 0), then we are reading only one more event as we
        should, and we'll block only at the next event. No big deal.
        - if mi->rli.ignore_log_space_limit is 0 but becomes 1 just after (so
        the clean value is 1), then we are going into wait_for_relay_log_space()
        for no reason, but this function will do a clean read, notice the clean
        value and exit immediately.
      */
3662 3663 3664 3665 3666
#ifndef DBUG_OFF
      {
        char llbuf1[22], llbuf2[22];
        DBUG_PRINT("info", ("log_space_limit=%s log_space_total=%s \
ignore_log_space_limit=%d",
3667 3668
                            llstr(rli->log_space_limit,llbuf1),
                            llstr(rli->log_space_total,llbuf2),
unknown's avatar
unknown committed
3669
                            (int) rli->ignore_log_space_limit));
3670 3671 3672
      }
#endif

3673
      if (rli->log_space_limit && rli->log_space_limit <
unknown's avatar
unknown committed
3674
          rli->log_space_total &&
3675
          !rli->ignore_log_space_limit)
unknown's avatar
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3676 3677 3678
        if (wait_for_relay_log_space(rli))
        {
          sql_print_error("Slave I/O thread aborted while waiting for relay \
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3679
log space");
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3680 3681 3682
          goto err;
        }
    }
3683
  }
unknown's avatar
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3684

unknown's avatar
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3685
  // error = 0;
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3686
err:
3687
  // print the current replication position
3688
  sql_print_information("Slave I/O thread exiting, read up to log '%s', position %s",
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3689
                  IO_RPL_LOG_NAME, llstr(mi->master_log_pos,llbuff));
He Zhenxing's avatar
He Zhenxing committed
3690
  RUN_HOOK(binlog_relay_io, thread_stop, (thd, mi));
3691
  thd->reset_query();
unknown's avatar
unknown committed
3692
  thd->reset_db(NULL, 0);
unknown's avatar
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3693 3694
  if (mysql)
  {
3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705
    /*
      Here we need to clear the active VIO before closing the
      connection with the master.  The reason is that THD::awake()
      might be called from terminate_slave_thread() because somebody
      issued a STOP SLAVE.  If that happends, the close_active_vio()
      can be called in the middle of closing the VIO associated with
      the 'mysql' object, causing a crash.
    */
#ifdef SIGNAL_WITH_VIO_CLOSE
    thd->clear_active_vio();
#endif
unknown's avatar
SCRUM  
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3706
    mysql_close(mysql);
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3707 3708
    mi->mysql=0;
  }
3709
  write_ignored_events_info_to_relay_log(thd, mi);
3710
  thd_proc_info(thd, "Waiting for slave mutex on exit");
Marc Alff's avatar
Marc Alff committed
3711
  mysql_mutex_lock(&mi->run_lock);
3712

3713
err_during_init:
3714 3715 3716
  /* Forget the relay log's format */
  delete mi->rli.relay_log.description_event_for_queue;
  mi->rli.relay_log.description_event_for_queue= 0;
3717
  // TODO: make rpl_status part of Master_info
3718
  change_rpl_status(RPL_ACTIVE_SLAVE,RPL_IDLE_SLAVE);
Marc Alff's avatar
Marc Alff committed
3719
  mysql_mutex_lock(&LOCK_thread_count);
3720
  THD_CHECK_SENTRY(thd);
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3721
  delete thd;
Marc Alff's avatar
Marc Alff committed
3722
  mysql_mutex_unlock(&LOCK_thread_count);
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3723
  mi->abort_slave= 0;
3724
  mi->slave_running= MYSQL_SLAVE_NOT_RUN;
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3725
  mi->io_thd= 0;
3726 3727 3728 3729 3730
  /*
    Note: the order of the two following calls (first broadcast, then unlock)
    is important. Otherwise a killer_thread can execute between the calls and
    delete the mi structure leading to a crash! (see BUG#25306 for details)
   */ 
Marc Alff's avatar
Marc Alff committed
3731
  mysql_cond_broadcast(&mi->stop_cond);       // tell the world we are done
3732
  DBUG_EXECUTE_IF("simulate_slave_delay_at_terminate_bug38694", sleep(5););
Marc Alff's avatar
Marc Alff committed
3733
  mysql_mutex_unlock(&mi->run_lock);
3734 3735

  DBUG_LEAVE;                                   // Must match DBUG_ENTER()
3736
  my_thread_end();
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3737
  pthread_exit(0);
3738
  return 0;                                     // Avoid compiler warnings
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3739 3740
}

3741 3742 3743
/*
  Check the temporary directory used by commands like
  LOAD DATA INFILE.
3744 3745 3746 3747

  As the directory never changes during a mysqld run, we only
  test this once and cache the result. This also resolve a race condition
  when this can be run by multiple threads at the same time.
3748
 */
3749 3750 3751 3752

static bool check_temp_dir_run= 0;
static int check_temp_dir_result= 0;

3753
static 
3754
int check_temp_dir(char* tmp_file)
3755
{
3756 3757
  File fd;
  int result= 1;                                // Assume failure
3758
  MY_DIR *dirp;
3759 3760
  char tmp_dir[FN_REFLEN];
  size_t tmp_dir_size;
3761 3762
  DBUG_ENTER("check_temp_dir");

3763 3764 3765 3766 3767 3768 3769 3770
  mysql_mutex_lock(&LOCK_thread_count);
  if (check_temp_dir_run)
  {
    result= check_temp_dir_result;
    goto end;
  }
  check_temp_dir_run= 1;

3771 3772 3773 3774 3775
  /*
    Get the directory from the temporary file.
  */
  dirname_part(tmp_dir, tmp_file, &tmp_dir_size);

3776 3777 3778 3779
  /*
    Check if the directory exists.
   */
  if (!(dirp=my_dir(tmp_dir,MYF(MY_WME))))
3780
    goto end;
3781 3782 3783
  my_dirend(dirp);

  /*
3784 3785
    Check permissions to create a file. We use O_TRUNC to ensure that
    things works even if we happen to have and old file laying around.
3786
   */
Marc Alff's avatar
Marc Alff committed
3787 3788
  if ((fd= mysql_file_create(key_file_misc,
                             tmp_file, CREATE_MODE,
3789
                             O_WRONLY | O_BINARY | O_TRUNC | O_NOFOLLOW,
Marc Alff's avatar
Marc Alff committed
3790
                             MYF(MY_WME))) < 0)
3791
    goto end;
3792

3793
  result= 0;                                    // Directory name ok
3794 3795 3796
  /*
    Clean up.
   */
Marc Alff's avatar
Marc Alff committed
3797 3798
  mysql_file_close(fd, MYF(0));
  mysql_file_delete(key_file_misc, tmp_file, MYF(0));
3799

3800 3801 3802 3803
end:
  check_temp_dir_result= result;
  mysql_mutex_unlock(&LOCK_thread_count);
  DBUG_RETURN(result);
3804
}
unknown's avatar
unknown committed
3805

3806

3807 3808 3809 3810 3811
/**
  Slave SQL thread entry point.

  @param arg Pointer to Relay_log_info object that holds information
  for the SQL thread.
unknown's avatar
unknown committed
3812

3813 3814
  @return Always 0.
*/
3815
pthread_handler_t handle_slave_sql(void *arg)
3816
{
unknown's avatar
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3817
  THD *thd;                     /* needs to be first for thread_stack */
3818
  char llbuff[22],llbuff1[22];
3819 3820
  char saved_log_name[FN_REFLEN];
  char saved_master_log_name[FN_REFLEN];
3821 3822
  my_off_t UNINIT_VAR(saved_log_pos);
  my_off_t UNINIT_VAR(saved_master_log_pos);
3823
  my_off_t saved_skip= 0;
3824 3825
  Master_info *mi= ((Master_info*)arg);
  Relay_log_info* rli = &mi->rli;
unknown's avatar
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3826 3827 3828 3829
  const char *errmsg;

  // needs to call my_thread_init(), otherwise we get a coredump in DBUG_ stuff
  my_thread_init();
3830
  DBUG_ENTER("handle_slave_sql");
unknown's avatar
unknown committed
3831

Michael Widenius's avatar
Michael Widenius committed
3832 3833
  LINT_INIT(saved_master_log_pos);
  LINT_INIT(saved_log_pos);
3834 3835 3836

  thd = new THD; // note that contructor of THD uses DBUG_ !
  thd->thread_stack = (char*)&thd; // remember where our stack is
3837
  thd->rpl_filter = mi->rpl_filter;
3838

3839
  DBUG_ASSERT(rli->inited);
3840
  DBUG_ASSERT(rli->mi == mi);
Marc Alff's avatar
Marc Alff committed
3841
  mysql_mutex_lock(&rli->run_lock);
3842
  DBUG_ASSERT(!rli->slave_running);
unknown's avatar
unknown committed
3843
  errmsg= 0;
unknown's avatar
unknown committed
3844
#ifndef DBUG_OFF
3845
  rli->events_till_abort = abort_slave_event_count;
unknown's avatar
unknown committed
3846
#endif
3847

3848
  rli->sql_thd= thd;
3849
  
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unknown committed
3850 3851
  /* Inform waiting threads that slave has started */
  rli->slave_run_id++;
3852
  rli->slave_running= MYSQL_SLAVE_RUN_NOT_CONNECT;
unknown's avatar
unknown committed
3853

3854
  pthread_detach_this_thread();
3855
  if (init_slave_thread(thd, mi, SLAVE_THD_SQL))
unknown's avatar
unknown committed
3856 3857 3858 3859 3860
  {
    /*
      TODO: this is currently broken - slave start and change master
      will be stuck if we fail here
    */
Marc Alff's avatar
Marc Alff committed
3861
    mysql_cond_broadcast(&rli->start_cond);
3862 3863
    rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, 
                "Failed during slave thread initialization");
3864
    goto err_during_init;
unknown's avatar
unknown committed
3865
  }
3866
  thd->init_for_queries();
3867
  thd->rli_slave= rli;
3868
  if ((rli->deferred_events_collecting= mi->rpl_filter->is_on()))
3869 3870 3871 3872
  {
    rli->deferred_events= new Deferred_log_events(rli);
  }

3873
  thd->temporary_tables = rli->save_temporary_tables; // restore temp tables
3874
  set_thd_in_use_temporary_tables(rli);   // (re)set sql_thd in use for saved temp tables
3875
  /*
3876
    binlog_annotate_row_events must be TRUE only after an Annotate_rows event
3877 3878 3879
    has been recieved and only till the last corresponding rbr event has been
    applied. In all other cases it must be FALSE.
  */
3880
  thd->variables.binlog_annotate_row_events= 0;
Marc Alff's avatar
Marc Alff committed
3881
  mysql_mutex_lock(&LOCK_thread_count);
3882
  threads.append(thd);
Marc Alff's avatar
Marc Alff committed
3883
  mysql_mutex_unlock(&LOCK_thread_count);
3884 3885 3886 3887 3888 3889 3890 3891
  /*
    We are going to set slave_running to 1. Assuming slave I/O thread is
    alive and connected, this is going to make Seconds_Behind_Master be 0
    i.e. "caught up". Even if we're just at start of thread. Well it's ok, at
    the moment we start we can think we are caught up, and the next second we
    start receiving data so we realize we are not caught up and
    Seconds_Behind_Master grows. No big deal.
  */
3892
  rli->abort_slave = 0;
Marc Alff's avatar
Marc Alff committed
3893 3894
  mysql_mutex_unlock(&rli->run_lock);
  mysql_cond_broadcast(&rli->start_cond);
3895

unknown's avatar
unknown committed
3896 3897 3898
  /*
    Reset errors for a clean start (otherwise, if the master is idle, the SQL
    thread may execute no Query_log_event, so the error will remain even
unknown's avatar
unknown committed
3899
    though there's no problem anymore). Do not reset the master timestamp
3900 3901 3902 3903
    (imagine the slave has caught everything, the STOP SLAVE and START SLAVE:
    as we are not sure that we are going to receive a query, we want to
    remember the last master timestamp (to say how many seconds behind we are
    now.
unknown's avatar
unknown committed
3904
    But the master timestamp is reset by RESET SLAVE & CHANGE MASTER.
unknown's avatar
unknown committed
3905
  */
3906
  rli->clear_error();
3907 3908

  //tell the I/O thread to take relay_log_space_limit into account from now on
Marc Alff's avatar
Marc Alff committed
3909
  mysql_mutex_lock(&rli->log_space_lock);
3910
  rli->ignore_log_space_limit= 0;
Marc Alff's avatar
Marc Alff committed
3911
  mysql_mutex_unlock(&rli->log_space_lock);
3912
  rli->trans_retries= 0; // start from "no error"
unknown's avatar
unknown committed
3913
  DBUG_PRINT("info", ("rli->trans_retries: %lu", rli->trans_retries));
3914

3915
  if (init_relay_log_pos(rli,
unknown's avatar
unknown committed
3916 3917 3918
                         rli->group_relay_log_name,
                         rli->group_relay_log_pos,
                         1 /*need data lock*/, &errmsg,
3919
                         1 /*look for a description_event*/))
3920 3921 3922
  { 
    rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, 
                "Error initializing relay log position: %s", errmsg);
3923 3924
    goto err;
  }
3925
  THD_CHECK_SENTRY(thd);
3926 3927 3928 3929
#ifndef DBUG_OFF
  {
    char llbuf1[22], llbuf2[22];
    DBUG_PRINT("info", ("my_b_tell(rli->cur_log)=%s rli->event_relay_log_pos=%s",
unknown's avatar
unknown committed
3930
                        llstr(my_b_tell(rli->cur_log),llbuf1),
3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949
                        llstr(rli->event_relay_log_pos,llbuf2)));
    DBUG_ASSERT(rli->event_relay_log_pos >= BIN_LOG_HEADER_SIZE);
    /*
      Wonder if this is correct. I (Guilhem) wonder if my_b_tell() returns the
      correct position when it's called just after my_b_seek() (the questionable
      stuff is those "seek is done on next read" comments in the my_b_seek()
      source code).
      The crude reality is that this assertion randomly fails whereas
      replication seems to work fine. And there is no easy explanation why it
      fails (as we my_b_seek(rli->event_relay_log_pos) at the very end of
      init_relay_log_pos() called above). Maybe the assertion would be
      meaningful if we held rli->data_lock between the my_b_seek() and the
      DBUG_ASSERT().
    */
#ifdef SHOULD_BE_CHECKED
    DBUG_ASSERT(my_b_tell(rli->cur_log) == rli->event_relay_log_pos);
#endif
  }
#endif
3950
  DBUG_ASSERT(rli->sql_thd == thd);
3951 3952

  DBUG_PRINT("master_info",("log_file_name: %s  position: %s",
unknown's avatar
unknown committed
3953 3954
                            rli->group_master_log_name,
                            llstr(rli->group_master_log_pos,llbuff)));
3955
  if (global_system_variables.log_warnings)
3956
    sql_print_information("Slave SQL thread initialized, starting replication in \
unknown's avatar
unknown committed
3957
log '%s' at position %s, relay log '%s' position: %s", RPL_LOG_NAME,
unknown's avatar
unknown committed
3958 3959
                    llstr(rli->group_master_log_pos,llbuff),rli->group_relay_log_name,
                    llstr(rli->group_relay_log_pos,llbuff1));
3960

3961
  if (check_temp_dir(rli->slave_patternload_file))
3962
  {
Marc Alff's avatar
Marc Alff committed
3963
    rli->report(ERROR_LEVEL, thd->stmt_da->sql_errno(), 
3964
                "Unable to use slave's temporary directory %s - %s", 
Marc Alff's avatar
Marc Alff committed
3965
                slave_load_tmpdir, thd->stmt_da->message());
3966 3967 3968
    goto err;
  }

3969 3970 3971 3972 3973 3974 3975 3976 3977
  /* Load the set of seen GTIDs, if we did not already. */
  if (rpl_load_gtid_slave_state(thd))
  {
    rli->report(ERROR_LEVEL, thd->stmt_da->sql_errno(), 
                "Unable to load replication GTID slave state from mysql.%s: %s",
                rpl_gtid_slave_state_table_name.str, thd->stmt_da->message());
    goto err;
  }

unknown's avatar
unknown committed
3978
  /* execute init_slave variable */
3979
  if (opt_init_slave.length)
unknown's avatar
unknown committed
3980
  {
3981
    execute_init_command(thd, &opt_init_slave, &LOCK_sys_init_slave);
3982
    if (thd->is_slave_error)
unknown's avatar
unknown committed
3983
    {
Marc Alff's avatar
Marc Alff committed
3984
      rli->report(ERROR_LEVEL, thd->stmt_da->sql_errno(),
3985
                  "Slave SQL thread aborted. Can't execute init_slave query");
unknown's avatar
unknown committed
3986 3987 3988 3989
      goto err;
    }
  }

3990 3991 3992 3993
  /*
    First check until condition - probably there is nothing to execute. We
    do not want to wait for next event in this case.
  */
Marc Alff's avatar
Marc Alff committed
3994
  mysql_mutex_lock(&rli->data_lock);
3995 3996
  if (rli->slave_skip_counter)
  {
3997 3998
    strmake(saved_log_name, rli->group_relay_log_name, FN_REFLEN - 1);
    strmake(saved_master_log_name, rli->group_master_log_name, FN_REFLEN - 1);
3999 4000 4001 4002
    saved_log_pos= rli->group_relay_log_pos;
    saved_master_log_pos= rli->group_master_log_pos;
    saved_skip= rli->slave_skip_counter;
  }
unknown's avatar
unknown committed
4003 4004
  if ((rli->until_condition == Relay_log_info::UNTIL_MASTER_POS ||
       rli->until_condition == Relay_log_info::UNTIL_RELAY_POS) &&
4005
      rli->is_until_satisfied(thd, NULL))
4006 4007 4008 4009
  {
    char buf[22];
    sql_print_information("Slave SQL thread stopped because it reached its"
                          " UNTIL position %s", llstr(rli->until_pos(), buf));
Marc Alff's avatar
Marc Alff committed
4010
    mysql_mutex_unlock(&rli->data_lock);
4011 4012
    goto err;
  }
Marc Alff's avatar
Marc Alff committed
4013
  mysql_mutex_unlock(&rli->data_lock);
4014

4015 4016
  /* Read queries from the IO/THREAD until this thread is killed */

4017
  while (!sql_slave_killed(thd,rli))
4018
  {
4019
    thd_proc_info(thd, "Reading event from the relay log");
4020
    DBUG_ASSERT(rli->sql_thd == thd);
4021
    THD_CHECK_SENTRY(thd);
4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036

    if (saved_skip && rli->slave_skip_counter == 0)
    {
      sql_print_information("'SQL_SLAVE_SKIP_COUNTER=%ld' executed at "
        "relay_log_file='%s', relay_log_pos='%ld', master_log_name='%s', "
        "master_log_pos='%ld' and new position at "
        "relay_log_file='%s', relay_log_pos='%ld', master_log_name='%s', "
        "master_log_pos='%ld' ",
        (ulong) saved_skip, saved_log_name, (ulong) saved_log_pos,
        saved_master_log_name, (ulong) saved_master_log_pos,
        rli->group_relay_log_name, (ulong) rli->group_relay_log_pos,
        rli->group_master_log_name, (ulong) rli->group_master_log_pos);
      saved_skip= 0;
    }
    
4037 4038
    if (exec_relay_log_event(thd,rli))
    {
4039
      DBUG_PRINT("info", ("exec_relay_log_event() failed"));
4040
      // do not scare the user if SQL thread was simply killed or stopped
4041
      if (!sql_slave_killed(thd,rli))
unknown's avatar
unknown committed
4042 4043
      {
        /*
4044 4045 4046
          retrieve as much info as possible from the thd and, error
          codes and warnings and print this to the error log as to
          allow the user to locate the error
unknown's avatar
unknown committed
4047
        */
4048
        uint32 const last_errno= rli->last_error().number;
4049

4050
        if (thd->is_error())
unknown's avatar
unknown committed
4051
        {
Marc Alff's avatar
Marc Alff committed
4052
          char const *const errmsg= thd->stmt_da->message();
4053 4054

          DBUG_PRINT("info",
Marc Alff's avatar
Marc Alff committed
4055 4056
                     ("thd->stmt_da->sql_errno()=%d; rli->last_error.number=%d",
                      thd->stmt_da->sql_errno(), last_errno));
4057
          if (last_errno == 0)
unknown's avatar
unknown committed
4058
          {
4059 4060 4061 4062
            /*
 	      This function is reporting an error which was not reported
 	      while executing exec_relay_log_event().
 	    */ 
4063
            rli->report(ERROR_LEVEL, thd->stmt_da->sql_errno(), "%s", errmsg);
unknown's avatar
unknown committed
4064
          }
Marc Alff's avatar
Marc Alff committed
4065
          else if (last_errno != thd->stmt_da->sql_errno())
unknown's avatar
unknown committed
4066
          {
4067 4068 4069 4070 4071 4072
            /*
             * An error was reported while executing exec_relay_log_event()
             * however the error code differs from what is in the thread.
             * This function prints out more information to help finding
             * what caused the problem.
             */  
unknown's avatar
unknown committed
4073
            sql_print_error("Slave (additional info): %s Error_code: %d",
Marc Alff's avatar
Marc Alff committed
4074
                            errmsg, thd->stmt_da->sql_errno());
unknown's avatar
unknown committed
4075 4076 4077 4078
          }
        }

        /* Print any warnings issued */
Marc Alff's avatar
Marc Alff committed
4079
        List_iterator_fast<MYSQL_ERROR> it(thd->warning_info->warn_list());
unknown's avatar
unknown committed
4080
        MYSQL_ERROR *err;
4081 4082 4083 4084 4085
        /*
          Added controlled slave thread cancel for replication
          of user-defined variables.
        */
        bool udf_error = false;
unknown's avatar
unknown committed
4086
        while ((err= it++))
4087
        {
Marc Alff's avatar
Marc Alff committed
4088
          if (err->get_sql_errno() == ER_CANT_OPEN_LIBRARY)
4089
            udf_error = true;
Marc Alff's avatar
Marc Alff committed
4090
          sql_print_warning("Slave: %s Error_code: %d", err->get_message_text(), err->get_sql_errno());
4091 4092 4093 4094 4095 4096 4097 4098 4099
        }
        if (udf_error)
          sql_print_error("Error loading user-defined library, slave SQL "
            "thread aborted. Install the missing library, and restart the "
            "slave SQL thread with \"SLAVE START\". We stopped at log '%s' "
            "position %s", RPL_LOG_NAME, llstr(rli->group_master_log_pos, 
            llbuff));
        else
          sql_print_error("\
4100
Error running query, slave SQL thread aborted. Fix the problem, and restart \
unknown's avatar
unknown committed
4101
the slave SQL thread with \"SLAVE START\". We stopped at log \
4102
'%s' position %s", RPL_LOG_NAME, llstr(rli->group_master_log_pos, llbuff));
unknown's avatar
unknown committed
4103
      }
4104 4105
      goto err;
    }
4106
    rli->executed_entries++;
4107
  }
4108

4109
  /* Thread stopped. Print the current replication position to the log */
unknown's avatar
unknown committed
4110
  sql_print_information("Slave SQL thread exiting, replication stopped in log "
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4111 4112
                        "'%s' at position %s",
                        RPL_LOG_NAME, llstr(rli->group_master_log_pos,llbuff));
4113 4114

 err:
4115 4116 4117 4118 4119 4120 4121

  /*
    Some events set some playgrounds, which won't be cleared because thread
    stops. Stopping of this thread may not be known to these events ("stop"
    request is detected only by the present function, not by events), so we
    must "proactively" clear playgrounds:
  */
4122
  thd->clear_error();
4123
  rli->cleanup_context(thd, 1);
4124 4125 4126 4127 4128
  /*
    Some extra safety, which should not been needed (normally, event deletion
    should already have done these assignments (each event which sets these
    variables is supposed to set them to 0 before terminating)).
  */
4129
  thd->catalog= 0;
4130
  thd->reset_query();
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4131
  thd->reset_db(NULL, 0);
4132
  thd_proc_info(thd, "Waiting for slave mutex on exit");
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4133
  mysql_mutex_lock(&rli->run_lock);
4134
err_during_init:
4135
  /* We need data_lock, at least to wake up any waiting master_pos_wait() */
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4136
  mysql_mutex_lock(&rli->data_lock);
4137
  DBUG_ASSERT(rli->slave_running == MYSQL_SLAVE_RUN_NOT_CONNECT); // tracking buffer overrun
4138
  /* When master_pos_wait() wakes up it will check this and terminate */
4139
  rli->slave_running= MYSQL_SLAVE_NOT_RUN;
4140 4141 4142
  /* Forget the relay log's format */
  delete rli->relay_log.description_event_for_exec;
  rli->relay_log.description_event_for_exec= 0;
4143
  /* Wake up master_pos_wait() */
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4144
  mysql_mutex_unlock(&rli->data_lock);
4145
  DBUG_PRINT("info",("Signaling possibly waiting master_pos_wait() functions"));
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4146
  mysql_cond_broadcast(&rli->data_cond);
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4147
  rli->ignore_log_space_limit= 0; /* don't need any lock */
4148 4149
  /* we die so won't remember charset - re-update them on next thread start */
  rli->cached_charset_invalidate();
4150
  rli->save_temporary_tables = thd->temporary_tables;
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4151 4152 4153 4154 4155

  /*
    TODO: see if we can do this conditionally in next_event() instead
    to avoid unneeded position re-init
  */
4156 4157
  thd->temporary_tables = 0; // remove tempation from destructor to close them
  DBUG_ASSERT(rli->sql_thd == thd);
4158
  THD_CHECK_SENTRY(thd);
4159
  rli->sql_thd= 0;
4160
  set_thd_in_use_temporary_tables(rli);  // (re)set sql_thd in use for saved temp tables
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4161
  mysql_mutex_lock(&LOCK_thread_count);
4162
  THD_CHECK_SENTRY(thd);
4163
  delete thd;
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4164
  mysql_mutex_unlock(&LOCK_thread_count);
4165 4166 4167 4168 4169
 /*
  Note: the order of the broadcast and unlock calls below (first broadcast, then unlock)
  is important. Otherwise a killer_thread can execute between the calls and
  delete the mi structure leading to a crash! (see BUG#25306 for details)
 */ 
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4170
  mysql_cond_broadcast(&rli->stop_cond);
4171
  DBUG_EXECUTE_IF("simulate_slave_delay_at_terminate_bug38694", sleep(5););
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4172
  mysql_mutex_unlock(&rli->run_lock);  // tell the world we are done
4173 4174

  DBUG_LEAVE;                                   // Must match DBUG_ENTER()
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4175
  my_thread_end();
4176
  pthread_exit(0);
4177
  return 0;                                     // Avoid compiler warnings
4178
}
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4179

4180

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4181
/*
4182
  process_io_create_file()
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4183
*/
4184

4185
static int process_io_create_file(Master_info* mi, Create_file_log_event* cev)
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{
  int error = 1;
  ulong num_bytes;
  bool cev_not_written;
4190 4191
  THD *thd = mi->io_thd;
  NET *net = &mi->mysql->net;
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4192
  DBUG_ENTER("process_io_create_file");
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4193 4194

  if (unlikely(!cev->is_valid()))
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4195
    DBUG_RETURN(1);
4196

4197
  if (!mi->rpl_filter->db_ok(cev->db))
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  {
    skip_load_data_infile(net);
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4200
    DBUG_RETURN(0);
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4201 4202 4203
  }
  DBUG_ASSERT(cev->inited_from_old);
  thd->file_id = cev->file_id = mi->file_id++;
4204
  thd->variables.server_id = cev->server_id;
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  cev_not_written = 1;
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4206

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  if (unlikely(net_request_file(net,cev->fname)))
  {
    sql_print_error("Slave I/O: failed requesting download of '%s'",
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4210
                    cev->fname);
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    goto err;
  }

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  /*
    This dummy block is so we could instantiate Append_block_log_event
    once and then modify it slightly instead of doing it multiple times
    in the loop
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4218 4219
  */
  {
4220
    Append_block_log_event aev(thd,0,0,0,0);
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4221

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4222 4223 4224 4225
    for (;;)
    {
      if (unlikely((num_bytes=my_net_read(net)) == packet_error))
      {
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4226 4227 4228
        sql_print_error("Network read error downloading '%s' from master",
                        cev->fname);
        goto err;
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4229 4230 4231
      }
      if (unlikely(!num_bytes)) /* eof */
      {
4232 4233
	/* 3.23 master wants it */
        net_write_command(net, 0, (uchar*) "", 0, (uchar*) "", 0);
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4234 4235 4236 4237 4238 4239 4240
        /*
          If we wrote Create_file_log_event, then we need to write
          Execute_load_log_event. If we did not write Create_file_log_event,
          then this is an empty file and we can just do as if the LOAD DATA
          INFILE had not existed, i.e. write nothing.
        */
        if (unlikely(cev_not_written))
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4241 4242 4243 4244 4245
          break;
        Execute_load_log_event xev(thd,0,0);
        xev.log_pos = cev->log_pos;
        if (unlikely(mi->rli.relay_log.append(&xev)))
        {
4246 4247 4248
          mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE,
                     ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
                     "error writing Exec_load event to relay log");
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4249 4250 4251 4252
          goto err;
        }
        mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total);
        break;
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4253 4254 4255
      }
      if (unlikely(cev_not_written))
      {
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4256
        cev->block = net->read_pos;
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4257 4258 4259
        cev->block_len = num_bytes;
        if (unlikely(mi->rli.relay_log.append(cev)))
        {
4260 4261 4262
          mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE,
                     ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
                     "error writing Create_file event to relay log");
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4263 4264 4265 4266
          goto err;
        }
        cev_not_written=0;
        mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total);
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4267 4268 4269
      }
      else
      {
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4270
        aev.block = net->read_pos;
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4271 4272 4273 4274
        aev.block_len = num_bytes;
        aev.log_pos = cev->log_pos;
        if (unlikely(mi->rli.relay_log.append(&aev)))
        {
4275 4276 4277
          mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE,
                     ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
                     "error writing Append_block event to relay log");
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4278 4279 4280
          goto err;
        }
        mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total) ;
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4281 4282 4283 4284 4285
      }
    }
  }
  error=0;
err:
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4286
  DBUG_RETURN(error);
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4287
}
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4288

4289

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4290
/*
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4291 4292 4293 4294
  Start using a new binary log on the master

  SYNOPSIS
    process_io_rotate()
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4295 4296
    mi                  master_info for the slave
    rev                 The rotate log event read from the binary log
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4297 4298

  DESCRIPTION
4299
    Updates the master info with the place in the next binary
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4300
    log where we should start reading.
4301
    Rotate the relay log to avoid mixed-format relay logs.
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4302 4303 4304 4305 4306

  NOTES
    We assume we already locked mi->data_lock

  RETURN VALUES
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4307 4308
    0           ok
    1           Log event is illegal
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4309 4310 4311

*/

4312
static int process_io_rotate(Master_info *mi, Rotate_log_event *rev)
4313
{
4314
  DBUG_ENTER("process_io_rotate");
Marc Alff's avatar
Marc Alff committed
4315
  mysql_mutex_assert_owner(&mi->data_lock);
4316

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4317
  if (unlikely(!rev->is_valid()))
4318
    DBUG_RETURN(1);
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4319

4320
  /* Safe copy as 'rev' has been "sanitized" in Rotate_log_event's ctor */
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4321 4322
  memcpy(mi->master_log_name, rev->new_log_ident, rev->ident_len+1);
  mi->master_log_pos= rev->pos;
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4323
  DBUG_PRINT("info", ("master_log_pos: '%s' %lu",
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4324
                      mi->master_log_name, (ulong) mi->master_log_pos));
4325
#ifndef DBUG_OFF
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4326 4327 4328 4329 4330
  /*
    If we do not do this, we will be getting the first
    rotate event forever, so we need to not disconnect after one.
  */
  if (disconnect_slave_event_count)
4331
    mi->events_till_disconnect++;
4332
#endif
4333

4334 4335 4336 4337 4338 4339 4340 4341 4342
  /*
    If description_event_for_queue is format <4, there is conversion in the
    relay log to the slave's format (4). And Rotate can mean upgrade or
    nothing. If upgrade, it's to 5.0 or newer, so we will get a Format_desc, so
    no need to reset description_event_for_queue now. And if it's nothing (same
    master version as before), no need (still using the slave's format).
  */
  if (mi->rli.relay_log.description_event_for_queue->binlog_version >= 4)
  {
4343 4344 4345
    DBUG_ASSERT(mi->rli.relay_log.description_event_for_queue->checksum_alg ==
                mi->rli.relay_log.relay_log_checksum_alg);
    
4346 4347 4348 4349
    delete mi->rli.relay_log.description_event_for_queue;
    /* start from format 3 (MySQL 4.0) again */
    mi->rli.relay_log.description_event_for_queue= new
      Format_description_log_event(3);
4350 4351
    mi->rli.relay_log.description_event_for_queue->checksum_alg=
      mi->rli.relay_log.relay_log_checksum_alg;    
4352
  }
4353 4354 4355 4356
  /*
    Rotate the relay log makes binlog format detection easier (at next slave
    start or mysqlbinlog)
  */
4357
  DBUG_RETURN(rotate_relay_log(mi) /* will take the right mutexes */);
4358 4359
}

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4360
/*
4361 4362
  Reads a 3.23 event and converts it to the slave's format. This code was
  copied from MySQL 4.0.
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4363
*/
4364
static int queue_binlog_ver_1_event(Master_info *mi, const char *buf,
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4365
                           ulong event_len)
4366
{
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4367
  const char *errmsg = 0;
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4368 4369 4370
  ulong inc_pos;
  bool ignore_event= 0;
  char *tmp_buf = 0;
4371
  Relay_log_info *rli= &mi->rli;
4372
  DBUG_ENTER("queue_binlog_ver_1_event");
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4373

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4374 4375 4376
  /*
    If we get Load event, we need to pass a non-reusable buffer
    to read_log_event, so we do a trick
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4377
  */
4378
  if ((uchar)buf[EVENT_TYPE_OFFSET] == LOAD_EVENT)
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4379 4380 4381
  {
    if (unlikely(!(tmp_buf=(char*)my_malloc(event_len+1,MYF(MY_WME)))))
    {
4382 4383
      mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
                 ER(ER_SLAVE_FATAL_ERROR), "Memory allocation failed");
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4384
      DBUG_RETURN(1);
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4385 4386
    }
    memcpy(tmp_buf,buf,event_len);
4387 4388 4389 4390 4391 4392 4393 4394
    /*
      Create_file constructor wants a 0 as last char of buffer, this 0 will
      serve as the string-termination char for the file's name (which is at the
      end of the buffer)
      We must increment event_len, otherwise the event constructor will not see
      this end 0, which leads to segfault.
    */
    tmp_buf[event_len++]=0;
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4395
    int4store(tmp_buf+EVENT_LEN_OFFSET, event_len);
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4396 4397
    buf = (const char*)tmp_buf;
  }
4398 4399 4400 4401 4402 4403
  /*
    This will transform LOAD_EVENT into CREATE_FILE_EVENT, ask the master to
    send the loaded file, and write it to the relay log in the form of
    Append_block/Exec_load (the SQL thread needs the data, as that thread is not
    connected to the master).
  */
4404 4405 4406
  Log_event *ev=
    Log_event::read_log_event(buf, event_len, &errmsg,
                              mi->rli.relay_log.description_event_for_queue, 0);
4407
  if (unlikely(!ev))
4408 4409
  {
    sql_print_error("Read invalid event from master: '%s',\
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4410
 master could be corrupt but a more likely cause of this is a bug",
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4411
                    errmsg);
4412
    my_free(tmp_buf);
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4413
    DBUG_RETURN(1);
4414
  }
4415

Marc Alff's avatar
Marc Alff committed
4416
  mysql_mutex_lock(&mi->data_lock);
4417
  ev->log_pos= mi->master_log_pos; /* 3.23 events don't contain log_pos */
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4418
  switch (ev->get_type_code()) {
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4419
  case STOP_EVENT:
4420
    ignore_event= 1;
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4421 4422
    inc_pos= event_len;
    break;
4423
  case ROTATE_EVENT:
4424
    if (unlikely(process_io_rotate(mi,(Rotate_log_event*)ev)))
4425 4426
    {
      delete ev;
Marc Alff's avatar
Marc Alff committed
4427
      mysql_mutex_unlock(&mi->data_lock);
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4428
      DBUG_RETURN(1);
4429
    }
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4430
    inc_pos= 0;
4431
    break;
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4432
  case CREATE_FILE_EVENT:
4433 4434 4435 4436 4437 4438
    /*
      Yes it's possible to have CREATE_FILE_EVENT here, even if we're in
      queue_old_event() which is for 3.23 events which don't comprise
      CREATE_FILE_EVENT. This is because read_log_event() above has just
      transformed LOAD_EVENT into CREATE_FILE_EVENT.
    */
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4439
  {
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4440
    /* We come here when and only when tmp_buf != 0 */
4441
    DBUG_ASSERT(tmp_buf != 0);
4442 4443
    inc_pos=event_len;
    ev->log_pos+= inc_pos;
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4444
    int error = process_io_create_file(mi,(Create_file_log_event*)ev);
4445
    delete ev;
4446
    mi->master_log_pos += inc_pos;
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4447
    DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
Marc Alff's avatar
Marc Alff committed
4448
    mysql_mutex_unlock(&mi->data_lock);
4449
    my_free(tmp_buf);
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4450
    DBUG_RETURN(error);
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4451
  }
4452
  default:
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4453
    inc_pos= event_len;
4454 4455
    break;
  }
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4456
  if (likely(!ignore_event))
4457
  {
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4458 4459
    if (ev->log_pos)
      /*
4460 4461 4462 4463
         Don't do it for fake Rotate events (see comment in
      Log_event::Log_event(const char* buf...) in log_event.cc).
      */
      ev->log_pos+= event_len; /* make log_pos be the pos of the end of the event */
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4464
    if (unlikely(rli->relay_log.append(ev)))
4465 4466
    {
      delete ev;
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4467
      mysql_mutex_unlock(&mi->data_lock);
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4468
      DBUG_RETURN(1);
4469
    }
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4470
    rli->relay_log.harvest_bytes_written(&rli->log_space_total);
4471 4472
  }
  delete ev;
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4473
  mi->master_log_pos+= inc_pos;
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4474
  DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
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Marc Alff committed
4475
  mysql_mutex_unlock(&mi->data_lock);
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4476
  DBUG_RETURN(0);
4477 4478
}

4479 4480 4481 4482
/*
  Reads a 4.0 event and converts it to the slave's format. This code was copied
  from queue_binlog_ver_1_event(), with some affordable simplifications.
*/
4483
static int queue_binlog_ver_3_event(Master_info *mi, const char *buf,
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4484
                           ulong event_len)
4485 4486 4487 4488
{
  const char *errmsg = 0;
  ulong inc_pos;
  char *tmp_buf = 0;
4489
  Relay_log_info *rli= &mi->rli;
4490 4491 4492
  DBUG_ENTER("queue_binlog_ver_3_event");

  /* read_log_event() will adjust log_pos to be end_log_pos */
4493 4494 4495
  Log_event *ev=
    Log_event::read_log_event(buf,event_len, &errmsg,
                              mi->rli.relay_log.description_event_for_queue, 0);
4496 4497 4498 4499
  if (unlikely(!ev))
  {
    sql_print_error("Read invalid event from master: '%s',\
 master could be corrupt but a more likely cause of this is a bug",
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4500
                    errmsg);
4501
    my_free(tmp_buf);
4502 4503
    DBUG_RETURN(1);
  }
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4504
  mysql_mutex_lock(&mi->data_lock);
4505 4506 4507 4508 4509 4510 4511
  switch (ev->get_type_code()) {
  case STOP_EVENT:
    goto err;
  case ROTATE_EVENT:
    if (unlikely(process_io_rotate(mi,(Rotate_log_event*)ev)))
    {
      delete ev;
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Marc Alff committed
4512
      mysql_mutex_unlock(&mi->data_lock);
4513 4514 4515 4516 4517 4518 4519 4520
      DBUG_RETURN(1);
    }
    inc_pos= 0;
    break;
  default:
    inc_pos= event_len;
    break;
  }
4521

4522 4523 4524
  if (unlikely(rli->relay_log.append(ev)))
  {
    delete ev;
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Marc Alff committed
4525
    mysql_mutex_unlock(&mi->data_lock);
4526 4527 4528 4529 4530 4531
    DBUG_RETURN(1);
  }
  rli->relay_log.harvest_bytes_written(&rli->log_space_total);
  delete ev;
  mi->master_log_pos+= inc_pos;
err:
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4532
  DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
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Marc Alff committed
4533
  mysql_mutex_unlock(&mi->data_lock);
4534 4535 4536 4537 4538 4539 4540 4541 4542 4543
  DBUG_RETURN(0);
}

/*
  queue_old_event()

  Writes a 3.23 or 4.0 event to the relay log, after converting it to the 5.0
  (exactly, slave's) format. To do the conversion, we create a 5.0 event from
  the 3.23/4.0 bytes, then write this event to the relay log.

unknown's avatar
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4544
  TODO:
4545 4546 4547 4548
    Test this code before release - it has to be tested on a separate
    setup with 3.23 master or 4.0 master
*/

4549
static int queue_old_event(Master_info *mi, const char *buf,
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4550
                           ulong event_len)
4551
{
4552 4553
  DBUG_ENTER("queue_old_event");

4554 4555 4556
  switch (mi->rli.relay_log.description_event_for_queue->binlog_version)
  {
  case 1:
4557
      DBUG_RETURN(queue_binlog_ver_1_event(mi,buf,event_len));
4558
  case 3:
4559
      DBUG_RETURN(queue_binlog_ver_3_event(mi,buf,event_len));
4560 4561
  default: /* unsupported format; eg version 2 */
    DBUG_PRINT("info",("unsupported binlog format %d in queue_old_event()",
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4562
                       mi->rli.relay_log.description_event_for_queue->binlog_version));
4563
    DBUG_RETURN(1);
4564 4565
  }
}
4566

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4567
/*
4568 4569
  queue_event()

4570 4571 4572 4573 4574
  If the event is 3.23/4.0, passes it to queue_old_event() which will convert
  it. Otherwise, writes a 5.0 (or newer) event to the relay log. Then there is
  no format conversion, it's pure read/write of bytes.
  So a 5.0.0 slave's relay log can contain events in the slave's format or in
  any >=5.0.0 format.
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*/

4577
static int queue_event(Master_info* mi,const char* buf, ulong event_len)
4578
{
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  int error= 0;
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  String error_msg;
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  ulonglong inc_pos;
  ulonglong event_pos;
4583
  Relay_log_info *rli= &mi->rli;
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  mysql_mutex_t *log_lock= rli->relay_log.get_log_lock();
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  ulong s_id;
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  bool unlock_data_lock= TRUE;
  /*
    FD_q must have been prepared for the first R_a event
    inside get_master_version_and_clock()
    Show-up of FD:s affects checksum_alg at once because
    that changes FD_queue.
  */
  uint8 checksum_alg= mi->checksum_alg_before_fd != BINLOG_CHECKSUM_ALG_UNDEF ? 
    mi->checksum_alg_before_fd :
    mi->rli.relay_log.relay_log_checksum_alg;

  char *save_buf= NULL; // needed for checksumming the fake Rotate event
  char rot_buf[LOG_EVENT_HEADER_LEN + ROTATE_HEADER_LEN + FN_REFLEN];

  DBUG_ASSERT(checksum_alg == BINLOG_CHECKSUM_ALG_OFF || 
              checksum_alg == BINLOG_CHECKSUM_ALG_UNDEF || 
              checksum_alg == BINLOG_CHECKSUM_ALG_CRC32); 

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  DBUG_ENTER("queue_event");
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  /*
    FD_queue checksum alg description does not apply in a case of
    FD itself. The one carries both parts of the checksum data.
  */
  if (buf[EVENT_TYPE_OFFSET] == FORMAT_DESCRIPTION_EVENT)
  {
    checksum_alg= get_checksum_alg(buf, event_len);
  }
  else if (buf[EVENT_TYPE_OFFSET] == START_EVENT_V3)
  {
    // checksum behaviour is similar to the pre-checksum FD handling
    mi->checksum_alg_before_fd= BINLOG_CHECKSUM_ALG_UNDEF;
    mi->rli.relay_log.description_event_for_queue->checksum_alg=
      mi->rli.relay_log.relay_log_checksum_alg= checksum_alg=
      BINLOG_CHECKSUM_ALG_OFF;
  }

  // does not hold always because of old binlog can work with NM 
  // DBUG_ASSERT(checksum_alg != BINLOG_CHECKSUM_ALG_UNDEF);

  // should hold unless manipulations with RL. Tests that do that
  // will have to refine the clause.
  DBUG_ASSERT(mi->rli.relay_log.relay_log_checksum_alg !=
              BINLOG_CHECKSUM_ALG_UNDEF);
              
  // Emulate the network corruption
  DBUG_EXECUTE_IF("corrupt_queue_event",
    if (buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT)
    {
      char *debug_event_buf_c = (char*) buf;
      int debug_cor_pos = rand() % (event_len - BINLOG_CHECKSUM_LEN);
      debug_event_buf_c[debug_cor_pos] =~ debug_event_buf_c[debug_cor_pos];
      DBUG_PRINT("info", ("Corrupt the event at queue_event: byte on position %d", debug_cor_pos));
      DBUG_SET("-d,corrupt_queue_event");
    }
  );
                                              
  if (event_checksum_test((uchar *) buf, event_len, checksum_alg))
  {
    error= ER_NETWORK_READ_EVENT_CHECKSUM_FAILURE;
    unlock_data_lock= FALSE;
    goto err;
  }
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  LINT_INIT(inc_pos);

4651
  if (mi->rli.relay_log.description_event_for_queue->binlog_version<4 &&
4652
      (uchar)buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT /* a way to escape */)
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    DBUG_RETURN(queue_old_event(mi,buf,event_len));
4654

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4655
  mysql_mutex_lock(&mi->data_lock);
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4657
  switch ((uchar)buf[EVENT_TYPE_OFFSET]) {
4658
  case STOP_EVENT:
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    /*
      We needn't write this event to the relay log. Indeed, it just indicates a
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      master server shutdown. The only thing this does is cleaning. But
      cleaning is already done on a per-master-thread basis (as the master
      server is shutting down cleanly, it has written all DROP TEMPORARY TABLE
4664
      prepared statements' deletion are TODO only when we binlog prep stmts).
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      We don't even increment mi->master_log_pos, because we may be just after
      a Rotate event. Btw, in a few milliseconds we are going to have a Start
      event from the next binlog (unless the master is presently running
      without --log-bin).
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    */
    goto err;
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  case ROTATE_EVENT:
  {
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    Rotate_log_event rev(buf, checksum_alg != BINLOG_CHECKSUM_ALG_OFF ?
                         event_len - BINLOG_CHECKSUM_LEN : event_len,
                         mi->rli.relay_log.description_event_for_queue);

    if (unlikely(process_io_rotate(mi, &rev)))
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    {
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      error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
4681
      goto err;
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    }
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    /* 
       Checksum special cases for the fake Rotate (R_f) event caused by the protocol
       of events generation and serialization in RL where Rotate of master is 
       queued right next to FD of slave.
       Since it's only FD that carries the alg desc of FD_s has to apply to R_m.
       Two special rules apply only to the first R_f which comes in before any FD_m.
       The 2nd R_f should be compatible with the FD_s that must have taken over
       the last seen FD_m's (A).
       
       RSC_1: If OM \and fake Rotate \and slave is configured to
              to compute checksum for its first FD event for RL
              the fake Rotate gets checksummed here.
    */
    if (uint4korr(&buf[0]) == 0 && checksum_alg == BINLOG_CHECKSUM_ALG_OFF &&
        mi->rli.relay_log.relay_log_checksum_alg != BINLOG_CHECKSUM_ALG_OFF)
    {
      ha_checksum rot_crc= my_checksum(0L, NULL, 0);
      event_len += BINLOG_CHECKSUM_LEN;
      memcpy(rot_buf, buf, event_len - BINLOG_CHECKSUM_LEN);
      int4store(&rot_buf[EVENT_LEN_OFFSET],
                uint4korr(&rot_buf[EVENT_LEN_OFFSET]) + BINLOG_CHECKSUM_LEN);
      rot_crc= my_checksum(rot_crc, (const uchar *) rot_buf,
                           event_len - BINLOG_CHECKSUM_LEN);
      int4store(&rot_buf[event_len - BINLOG_CHECKSUM_LEN], rot_crc);
      DBUG_ASSERT(event_len == uint4korr(&rot_buf[EVENT_LEN_OFFSET]));
      DBUG_ASSERT(mi->rli.relay_log.description_event_for_queue->checksum_alg ==
                  mi->rli.relay_log.relay_log_checksum_alg);
      /* the first one */
      DBUG_ASSERT(mi->checksum_alg_before_fd != BINLOG_CHECKSUM_ALG_UNDEF);
      save_buf= (char *) buf;
      buf= rot_buf;
    }
    else
      /*
        RSC_2: If NM \and fake Rotate \and slave does not compute checksum
        the fake Rotate's checksum is stripped off before relay-logging.
      */
      if (uint4korr(&buf[0]) == 0 && checksum_alg != BINLOG_CHECKSUM_ALG_OFF &&
          mi->rli.relay_log.relay_log_checksum_alg == BINLOG_CHECKSUM_ALG_OFF)
      {
        event_len -= BINLOG_CHECKSUM_LEN;
        memcpy(rot_buf, buf, event_len);
        int4store(&rot_buf[EVENT_LEN_OFFSET],
                  uint4korr(&rot_buf[EVENT_LEN_OFFSET]) - BINLOG_CHECKSUM_LEN);
        DBUG_ASSERT(event_len == uint4korr(&rot_buf[EVENT_LEN_OFFSET]));
        DBUG_ASSERT(mi->rli.relay_log.description_event_for_queue->checksum_alg ==
                    mi->rli.relay_log.relay_log_checksum_alg);
        /* the first one */
        DBUG_ASSERT(mi->checksum_alg_before_fd != BINLOG_CHECKSUM_ALG_UNDEF);
        save_buf= (char *) buf;
        buf= rot_buf;
      }
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    /*
      Now the I/O thread has just changed its mi->master_log_name, so
      incrementing mi->master_log_pos is nonsense.
    */
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    inc_pos= 0;
4740 4741
    break;
  }
4742 4743 4744 4745 4746 4747 4748
  case FORMAT_DESCRIPTION_EVENT:
  {
    /*
      Create an event, and save it (when we rotate the relay log, we will have
      to write this event again).
    */
    /*
4749 4750 4751
      We are the only thread which reads/writes description_event_for_queue.
      The relay_log struct does not move (though some members of it can
      change), so we needn't any lock (no rli->data_lock, no log lock).
4752
    */
4753
    Format_description_log_event* tmp;
4754
    const char* errmsg;
4755 4756
    // mark it as undefined that is irrelevant anymore
    mi->checksum_alg_before_fd= BINLOG_CHECKSUM_ALG_UNDEF;
4757
    if (!(tmp= (Format_description_log_event*)
4758
          Log_event::read_log_event(buf, event_len, &errmsg,
4759 4760
                                    mi->rli.relay_log.description_event_for_queue,
                                    1)))
4761
    {
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4762
      error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
4763 4764
      goto err;
    }
4765 4766
    delete mi->rli.relay_log.description_event_for_queue;
    mi->rli.relay_log.description_event_for_queue= tmp;
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    if (tmp->checksum_alg == BINLOG_CHECKSUM_ALG_UNDEF)
      tmp->checksum_alg= BINLOG_CHECKSUM_ALG_OFF;

    /* installing new value of checksum Alg for relay log */
    mi->rli.relay_log.relay_log_checksum_alg= tmp->checksum_alg;

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    /*
4774
       Though this does some conversion to the slave's format, this will
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       preserve the master's binlog format version, and number of event types.
4776
    */
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    /*
4778
       If the event was not requested by the slave (the slave did not ask for
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       it), i.e. has end_log_pos=0, we do not increment mi->master_log_pos
4780 4781 4782
    */
    inc_pos= uint4korr(buf+LOG_POS_OFFSET) ? event_len : 0;
    DBUG_PRINT("info",("binlog format is now %d",
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                       mi->rli.relay_log.description_event_for_queue->binlog_version));
4784 4785 4786

  }
  break;
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  case HEARTBEAT_LOG_EVENT:
  {
    /*
      HB (heartbeat) cannot come before RL (Relay)
    */
    char  llbuf[22];
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    Heartbeat_log_event hb(buf,
                           mi->rli.relay_log.relay_log_checksum_alg
                           != BINLOG_CHECKSUM_ALG_OFF ?
                           event_len - BINLOG_CHECKSUM_LEN : event_len,
                           mi->rli.relay_log.description_event_for_queue);
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    if (!hb.is_valid())
    {
      error= ER_SLAVE_HEARTBEAT_FAILURE;
      error_msg.append(STRING_WITH_LEN("inconsistent heartbeat event content;"));
      error_msg.append(STRING_WITH_LEN("the event's data: log_file_name "));
      error_msg.append(hb.get_log_ident(), (uint) strlen(hb.get_log_ident()));
      error_msg.append(STRING_WITH_LEN(" log_pos "));
      llstr(hb.log_pos, llbuf);
      error_msg.append(llbuf, strlen(llbuf));
      goto err;
    }
    mi->received_heartbeats++;
    /* 
       compare local and event's versions of log_file, log_pos.
       
       Heartbeat is sent only after an event corresponding to the corrdinates
       the heartbeat carries.
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       Slave can not have a higher coordinate except in the only
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       special case when mi->master_log_name, master_log_pos have never
       been updated by Rotate event i.e when slave does not have any history
       with the master (and thereafter mi->master_log_pos is NULL).

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       Slave can have lower coordinates, if some event from master was omitted.

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       TODO: handling `when' for SHOW SLAVE STATUS' snds behind
    */
    if ((memcmp(mi->master_log_name, hb.get_log_ident(), hb.get_ident_len())
         && mi->master_log_name != NULL)
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        || mi->master_log_pos > hb.log_pos)
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    {
      /* missed events of heartbeat from the past */
      error= ER_SLAVE_HEARTBEAT_FAILURE;
      error_msg.append(STRING_WITH_LEN("heartbeat is not compatible with local info;"));
      error_msg.append(STRING_WITH_LEN("the event's data: log_file_name "));
      error_msg.append(hb.get_log_ident(), (uint) strlen(hb.get_log_ident()));
      error_msg.append(STRING_WITH_LEN(" log_pos "));
      llstr(hb.log_pos, llbuf);
      error_msg.append(llbuf, strlen(llbuf));
      goto err;
    }
    goto skip_relay_logging;
  }
  break;
4842

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  case GTID_LIST_EVENT:
  {
    const char *errmsg;
    Gtid_list_log_event *glev;
    Log_event *tmp;

    if (mi->rli.until_condition != Relay_log_info::UNTIL_GTID)
      goto default_action;
    if (!(tmp= Log_event::read_log_event(buf, event_len, &errmsg,
           mi->rli.relay_log.description_event_for_queue,
           opt_slave_sql_verify_checksum)))
    {
      error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
      goto err;
    }
    glev= static_cast<Gtid_list_log_event *>(tmp);
    if (glev->gl_flags & Gtid_list_log_event::FLAG_UNTIL_REACHED)
    {
      char str_buf[128];
      String str(str_buf, sizeof(str_buf), system_charset_info);
      mi->rli.until_gtid_pos.to_string(&str);
      sql_print_information("Slave IO thread stops because it reached its"
                            " UNTIL master_gtid_pos %s", str.c_ptr_safe());
      mi->abort_slave= true;
    }
    delete glev;

    /*
      Do not update position for fake Gtid_list event (which has a zero
      end_log_pos).
    */
    inc_pos= uint4korr(buf+LOG_POS_OFFSET) ? event_len : 0;
  }
  break;

4878
  default:
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  default_action:
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    inc_pos= event_len;
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    break;
  }
4883

4884
  /*
4885
    If we filter events master-side (eg. @@skip_replication), we will see holes
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    in the event positions from the master. If we see such a hole, adjust
    mi->master_log_pos accordingly so we maintain the correct position (for
    reconnect, MASTER_POS_WAIT(), etc.)
  */
  if (inc_pos > 0 &&
      event_len >= LOG_POS_OFFSET+4 &&
      (event_pos= uint4korr(buf+LOG_POS_OFFSET)) > mi->master_log_pos + inc_pos)
  {
    inc_pos= event_pos - mi->master_log_pos;
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4895
    DBUG_PRINT("info", ("Adjust master_log_pos %llu->%llu to account for "
4896
                        "master-side filtering",
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                        mi->master_log_pos + inc_pos, event_pos));
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  }

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  /*
     If this event is originating from this server, don't queue it.
4902
     We don't check this for 3.23 events because it's simpler like this; 3.23
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     will be filtered anyway by the SQL slave thread which also tests the
     server id (we must also keep this test in the SQL thread, in case somebody
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     upgrades a 4.0 slave which has a not-filtered relay log).

     ANY event coming from ourselves can be ignored: it is obvious for queries;
     for STOP_EVENT/ROTATE_EVENT/START_EVENT: these cannot come from ourselves
     (--log-slave-updates would not log that) unless this slave is also its
     direct master (an unsupported, useless setup!).
  */

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  mysql_mutex_lock(log_lock);
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  s_id= uint4korr(buf + SERVER_ID_OFFSET);
4915 4916
  if ((s_id == global_system_variables.server_id &&
       !mi->rli.replicate_same_server_id) ||
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      /*
        the following conjunction deals with IGNORE_SERVER_IDS, if set
        If the master is on the ignore list, execution of
        format description log events and rotate events is necessary.
      */
      (mi->ignore_server_ids.elements > 0 &&
       mi->shall_ignore_server_id(s_id) &&
       /* everything is filtered out from non-master */
       (s_id != mi->master_id ||
        /* for the master meta information is necessary */
4927 4928
        (buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT &&
         buf[EVENT_TYPE_OFFSET] != ROTATE_EVENT))))
4929
  {
4930 4931
    /*
      Do not write it to the relay log.
4932 4933 4934 4935 4936 4937 4938 4939
      a) We still want to increment mi->master_log_pos, so that we won't
      re-read this event from the master if the slave IO thread is now
      stopped/restarted (more efficient if the events we are ignoring are big
      LOAD DATA INFILE).
      b) We want to record that we are skipping events, for the information of
      the slave SQL thread, otherwise that thread may let
      rli->group_relay_log_pos stay too small if the last binlog's event is
      ignored.
4940 4941 4942
      But events which were generated by this slave and which do not exist in
      the master's binlog (i.e. Format_desc, Rotate & Stop) should not increment
      mi->master_log_pos.
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      If the event is originated remotely and is being filtered out by
      IGNORE_SERVER_IDS it increments mi->master_log_pos
      as well as rli->group_relay_log_pos.
4946
    */
4947 4948
    if (!(s_id == global_system_variables.server_id &&
          !mi->rli.replicate_same_server_id) ||
4949 4950 4951
        (buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT &&
         buf[EVENT_TYPE_OFFSET] != ROTATE_EVENT &&
         buf[EVENT_TYPE_OFFSET] != STOP_EVENT))
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    {
4953
      mi->master_log_pos+= inc_pos;
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      memcpy(rli->ign_master_log_name_end, mi->master_log_name, FN_REFLEN);
      DBUG_ASSERT(rli->ign_master_log_name_end[0]);
      rli->ign_master_log_pos_end= mi->master_log_pos;
    }
4958
    rli->relay_log.signal_update(); // the slave SQL thread needs to re-check
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    DBUG_PRINT("info", ("master_log_pos: %lu, event originating from %u server, ignored",
                        (ulong) mi->master_log_pos, uint4korr(buf + SERVER_ID_OFFSET)));
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  }
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  else
  {
    /* write the event to the relay log */
4965
    if (likely(!(rli->relay_log.appendv(buf,event_len,0))))
4966 4967
    {
      mi->master_log_pos+= inc_pos;
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      DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
4969 4970
      rli->relay_log.harvest_bytes_written(&rli->log_space_total);
    }
4971
    else
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    {
      error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
    }
4975
    rli->ign_master_log_name_end[0]= 0; // last event is not ignored
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    if (save_buf != NULL)
      buf= save_buf;
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  }
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  mysql_mutex_unlock(log_lock);
4980

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skip_relay_logging:
  
4983
err:
4984
  if (unlock_data_lock)
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    mysql_mutex_unlock(&mi->data_lock);
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  DBUG_PRINT("info", ("error: %d", error));
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  if (error)
    mi->report(ERROR_LEVEL, error, ER(error), 
               (error == ER_SLAVE_RELAY_LOG_WRITE_FAILURE)?
               "could not queue event from master" :
               error_msg.ptr());
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  DBUG_RETURN(error);
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}

4995

4996
void end_relay_log_info(Relay_log_info* rli)
4997
{
4998 4999
  DBUG_ENTER("end_relay_log_info");

5000
  if (!rli->inited)
5001
    DBUG_VOID_RETURN;
5002
  if (rli->info_fd >= 0)
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  {
    end_io_cache(&rli->info_file);
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    mysql_file_close(rli->info_fd, MYF(MY_WME));
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    rli->info_fd = -1;
  }
5008
  if (rli->cur_log_fd >= 0)
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  {
    end_io_cache(&rli->cache_buf);
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    mysql_file_close(rli->cur_log_fd, MYF(MY_WME));
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    rli->cur_log_fd = -1;
  }
5014
  rli->inited = 0;
5015
  rli->relay_log.close(LOG_CLOSE_INDEX | LOG_CLOSE_STOP_EVENT);
5016
  rli->relay_log.harvest_bytes_written(&rli->log_space_total);
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  /*
    Delete the slave's temporary tables from memory.
    In the future there will be other actions than this, to ensure persistance
    of slave's temp tables after shutdown.
  */
  rli->close_temporary_tables();
5023
  DBUG_VOID_RETURN;
5024 5025
}

5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044

/**
  Hook to detach the active VIO before closing a connection handle.

  The client API might close the connection (and associated data)
  in case it encounters a unrecoverable (network) error. This hook
  is called from the client code before the VIO handle is deleted
  allows the thread to detach the active vio so it does not point
  to freed memory.

  Other calls to THD::clear_active_vio throughout this module are
  redundant due to the hook but are left in place for illustrative
  purposes.
*/

extern "C" void slave_io_thread_detach_vio()
{
#ifdef SIGNAL_WITH_VIO_CLOSE
  THD *thd= current_thd;
5045
  if (thd && thd->slave_thread)
5046 5047 5048 5049 5050
    thd->clear_active_vio();
#endif
}


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/*
  Try to connect until successful or slave killed
5053

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5054 5055
  SYNPOSIS
    safe_connect()
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    thd                 Thread handler for slave
    mysql               MySQL connection handle
    mi                  Replication handle
5059

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  RETURN
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    0   ok
    #   Error
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*/
5064

5065
static int safe_connect(THD* thd, MYSQL* mysql, Master_info* mi)
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{
5067 5068 5069
  DBUG_ENTER("safe_connect");

  DBUG_RETURN(connect_to_master(thd, mysql, mi, 0, 0));
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}

5072

5073
/*
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  SYNPOSIS
    connect_to_master()
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5076

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  IMPLEMENTATION
    Try to connect until successful or slave killed or we have retried
    master_retry_count times
5080
*/
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5081

5082
static int connect_to_master(THD* thd, MYSQL* mysql, Master_info* mi,
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                             bool reconnect, bool suppress_warnings)
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{
5085
  int slave_was_killed;
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  int last_errno= -2;                           // impossible error
5087
  ulong err_count=0;
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  char llbuff[22];
5089
  my_bool my_true= 1;
5090
  DBUG_ENTER("connect_to_master");
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5091

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5092
#ifndef DBUG_OFF
5093
  mi->events_till_disconnect = disconnect_slave_event_count;
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5094
#endif
5095
  ulong client_flag= CLIENT_REMEMBER_OPTIONS;
5096
  if (opt_slave_compressed_protocol)
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    client_flag=CLIENT_COMPRESS;                /* We will use compression */
5098

5099 5100
  mysql_options(mysql, MYSQL_OPT_CONNECT_TIMEOUT, (char *) &slave_net_timeout);
  mysql_options(mysql, MYSQL_OPT_READ_TIMEOUT, (char *) &slave_net_timeout);
5101 5102
  mysql_options(mysql, MYSQL_OPT_USE_THREAD_SPECIFIC_MEMORY,
                (char*) &my_true);
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5103

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#ifdef HAVE_OPENSSL
  if (mi->ssl)
5106
  {
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    mysql_ssl_set(mysql,
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                  mi->ssl_key[0]?mi->ssl_key:0,
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                  mi->ssl_cert[0]?mi->ssl_cert:0,
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                  mi->ssl_ca[0]?mi->ssl_ca:0,
                  mi->ssl_capath[0]?mi->ssl_capath:0,
                  mi->ssl_cipher[0]?mi->ssl_cipher:0);
5113 5114 5115
    mysql_options(mysql, MYSQL_OPT_SSL_VERIFY_SERVER_CERT,
                  &mi->ssl_verify_server_cert);
  }
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#endif

5118 5119 5120 5121
  mysql_options(mysql, MYSQL_SET_CHARSET_NAME, default_charset_info->csname);
  /* This one is not strictly needed but we have it here for completeness */
  mysql_options(mysql, MYSQL_SET_CHARSET_DIR, (char *) charsets_dir);

5122 5123 5124 5125
  /* Set MYSQL_PLUGIN_DIR in case master asks for an external authentication plugin */
  if (opt_plugin_dir_ptr && *opt_plugin_dir_ptr)
    mysql_options(mysql, MYSQL_PLUGIN_DIR, opt_plugin_dir_ptr);

5126 5127 5128 5129 5130 5131 5132 5133 5134 5135
  /* we disallow empty users */
  if (mi->user == NULL || mi->user[0] == 0)
  {
    mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
               ER(ER_SLAVE_FATAL_ERROR),
               "Invalid (empty) username when attempting to "
               "connect to the master server. Connection attempt "
               "terminated.");
    DBUG_RETURN(1);
  }
5136
  while (!(slave_was_killed = io_slave_killed(thd,mi)) &&
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5137 5138 5139
         (reconnect ? mysql_reconnect(mysql) != 0 :
          mysql_real_connect(mysql, mi->host, mi->user, mi->password, 0,
                             mi->port, 0, client_flag) == 0))
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  {
5141
    /* Don't repeat last error */
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SCRUM  
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5142
    if ((int)mysql_errno(mysql) != last_errno)
5143
    {
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SCRUM  
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5144
      last_errno=mysql_errno(mysql);
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      suppress_warnings= 0;
5146 5147
      mi->report(ERROR_LEVEL, last_errno,
                 "error %s to master '%s@%s:%d'"
5148
                 " - retry-time: %d  retries: %lu  message: %s",
5149 5150
                 (reconnect ? "reconnecting" : "connecting"),
                 mi->user, mi->host, mi->port,
5151 5152
                 mi->connect_retry, master_retry_count,
                 mysql_error(mysql));
5153
    }
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    /*
      By default we try forever. The reason is that failure will trigger
      master election, so if the user did not set master_retry_count we
5157
      do not want to have election triggered on the first failure to
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5158
      connect
5159
    */
5160
    if (++err_count == master_retry_count)
5161 5162
    {
      slave_was_killed=1;
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5163 5164
      if (reconnect)
        change_rpl_status(RPL_ACTIVE_SLAVE,RPL_LOST_SOLDIER);
5165 5166
      break;
    }
5167
    slave_sleep(thd,mi->connect_retry,io_slave_killed, mi);
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5168
  }
5169

5170 5171
  if (!slave_was_killed)
  {
5172
    mi->clear_error(); // clear possible left over reconnect error
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5173
    if (reconnect)
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5174
    {
5175
      if (!suppress_warnings && global_system_variables.log_warnings)
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        sql_print_information("Slave: connected to master '%s@%s:%d',\
5177
replication resumed in log '%s' at position %s", mi->user,
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5178 5179 5180
                        mi->host, mi->port,
                        IO_RPL_LOG_NAME,
                        llstr(mi->master_log_pos,llbuff));
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5181
    }
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    else
    {
      change_rpl_status(RPL_IDLE_SLAVE,RPL_ACTIVE_SLAVE);
5185 5186
      general_log_print(thd, COM_CONNECT_OUT, "%s@%s:%d",
                        mi->user, mi->host, mi->port);
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5187
    }
5188
#ifdef SIGNAL_WITH_VIO_CLOSE
5189
    thd->set_active_vio(mysql->net.vio);
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5190
#endif
5191
  }
5192
  mysql->reconnect= 1;
5193 5194
  DBUG_PRINT("exit",("slave_was_killed: %d", slave_was_killed));
  DBUG_RETURN(slave_was_killed);
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5195 5196
}

5197

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5198
/*
5199
  safe_reconnect()
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5200

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5201 5202 5203
  IMPLEMENTATION
    Try to connect until successful or slave killed or we have retried
    master_retry_count times
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5204 5205
*/

5206
static int safe_reconnect(THD* thd, MYSQL* mysql, Master_info* mi,
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5207
                          bool suppress_warnings)
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5208
{
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5209 5210
  DBUG_ENTER("safe_reconnect");
  DBUG_RETURN(connect_to_master(thd, mysql, mi, 1, suppress_warnings));
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5211 5212
}

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5213

He Zhenxing's avatar
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5214 5215 5216 5217
MYSQL *rpl_connect_master(MYSQL *mysql)
{
  THD *thd= current_thd;
  Master_info *mi= my_pthread_getspecific_ptr(Master_info*, RPL_MASTER_INFO);
5218 5219 5220
  bool allocated= false;
  my_bool my_true= 1;

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5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245
  if (!mi)
  {
    sql_print_error("'rpl_connect_master' must be called in slave I/O thread context.");
    return NULL;
  }

  if (!mysql)
  {
    if(!(mysql= mysql_init(NULL)))
    {
      sql_print_error("rpl_connect_master: failed in mysql_init()");
      return NULL;
    }
    allocated= true;
  }

  /*
    XXX: copied from connect_to_master, this function should not
    change the slave status, so we cannot use connect_to_master
    directly
    
    TODO: make this part a seperate function to eliminate duplication
  */
  mysql_options(mysql, MYSQL_OPT_CONNECT_TIMEOUT, (char *) &slave_net_timeout);
  mysql_options(mysql, MYSQL_OPT_READ_TIMEOUT, (char *) &slave_net_timeout);
5246 5247
  mysql_options(mysql, MYSQL_OPT_USE_THREAD_SPECIFIC_MEMORY,
                (char*) &my_true);
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5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266

#ifdef HAVE_OPENSSL
  if (mi->ssl)
  {
    mysql_ssl_set(mysql,
                  mi->ssl_key[0]?mi->ssl_key:0,
                  mi->ssl_cert[0]?mi->ssl_cert:0,
                  mi->ssl_ca[0]?mi->ssl_ca:0,
                  mi->ssl_capath[0]?mi->ssl_capath:0,
                  mi->ssl_cipher[0]?mi->ssl_cipher:0);
    mysql_options(mysql, MYSQL_OPT_SSL_VERIFY_SERVER_CERT,
                  &mi->ssl_verify_server_cert);
  }
#endif

  mysql_options(mysql, MYSQL_SET_CHARSET_NAME, default_charset_info->csname);
  /* This one is not strictly needed but we have it here for completeness */
  mysql_options(mysql, MYSQL_SET_CHARSET_DIR, (char *) charsets_dir);

5267 5268 5269
  if (mi->user == NULL
      || mi->user[0] == 0
      || io_slave_killed(thd, mi)
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5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283
      || !mysql_real_connect(mysql, mi->host, mi->user, mi->password, 0,
                             mi->port, 0, 0))
  {
    if (!io_slave_killed(thd, mi))
      sql_print_error("rpl_connect_master: error connecting to master: %s (server_error: %d)",
                      mysql_error(mysql), mysql_errno(mysql));
    
    if (allocated)
      mysql_close(mysql);                       // this will free the object
    return NULL;
  }
  return mysql;
}

5284 5285 5286 5287 5288 5289
/*
  Store the file and position where the execute-slave thread are in the
  relay log.

  SYNOPSIS
    flush_relay_log_info()
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5290
    rli                 Relay log information
5291 5292

  NOTES
5293 5294 5295
    - As this is only called by the slave thread or on STOP SLAVE, with the
      log_lock grabbed and the slave thread stopped, we don't need to have 
      a lock here.
5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309
    - If there is an active transaction, then we don't update the position
      in the relay log.  This is to ensure that we re-execute statements
      if we die in the middle of an transaction that was rolled back.
    - As a transaction never spans binary logs, we don't have to handle the
      case where we do a relay-log-rotation in the middle of the transaction.
      If this would not be the case, we would have to ensure that we
      don't delete the relay log file where the transaction started when
      we switch to a new relay log file.

  TODO
    - Change the log file information to a binary format to avoid calling
      longlong2str.

  RETURN VALUES
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5310 5311
    0   ok
    1   write error
5312 5313
*/

5314
bool flush_relay_log_info(Relay_log_info* rli)
5315
{
5316
  bool error=0;
5317
  DBUG_ENTER("flush_relay_log_info");
5318 5319

  if (unlikely(rli->no_storage))
5320
    DBUG_RETURN(0);
5321

5322 5323 5324
  IO_CACHE *file = &rli->info_file;
  char buff[FN_REFLEN*2+22*2+4], *pos;

5325
  my_b_seek(file, 0L);
5326
  pos=strmov(buff, rli->group_relay_log_name);
5327
  *pos++='\n';
5328
  pos= longlong10_to_str(rli->group_relay_log_pos, pos, 10);
5329
  *pos++='\n';
5330
  pos=strmov(pos, rli->group_master_log_name);
5331
  *pos++='\n';
5332
  pos=longlong10_to_str(rli->group_master_log_pos, pos, 10);
5333
  *pos='\n';
5334
  if (my_b_write(file, (uchar*) buff, (size_t) (pos-buff)+1))
5335 5336 5337
    error=1;
  if (flush_io_cache(file))
    error=1;
5338 5339 5340 5341 5342 5343 5344 5345
  if (sync_relayloginfo_period &&
      !error &&
      ++(rli->sync_counter) >= sync_relayloginfo_period)
  {
    if (my_sync(rli->info_fd, MYF(MY_WME)))
      error=1;
    rli->sync_counter= 0;
  }
5346 5347 5348 5349
  /* 
    Flushing the relay log is done by the slave I/O thread 
    or by the user on STOP SLAVE. 
   */
5350
  DBUG_RETURN(error);
5351 5352
}

5353

unknown's avatar
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5354
/*
5355
  Called when we notice that the current "hot" log got rotated under our feet.
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5356 5357
*/

5358
static IO_CACHE *reopen_relay_log(Relay_log_info *rli, const char **errmsg)
5359
{
5360
  DBUG_ENTER("reopen_relay_log");
5361 5362
  DBUG_ASSERT(rli->cur_log != &rli->cache_buf);
  DBUG_ASSERT(rli->cur_log_fd == -1);
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5363 5364

  IO_CACHE *cur_log = rli->cur_log=&rli->cache_buf;
5365
  if ((rli->cur_log_fd=open_binlog(cur_log,rli->event_relay_log_name,
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5366
                                   errmsg)) <0)
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5367
    DBUG_RETURN(0);
5368 5369
  /*
    We want to start exactly where we was before:
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5370 5371
    relay_log_pos       Current log pos
    pending             Number of bytes already processed from the event
5372
  */
5373
  rli->event_relay_log_pos= max(rli->event_relay_log_pos, BIN_LOG_HEADER_SIZE);
5374
  my_b_seek(cur_log,rli->event_relay_log_pos);
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5375
  DBUG_RETURN(cur_log);
5376 5377
}

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5378

5379 5380 5381 5382 5383 5384 5385 5386 5387 5388
/**
  Reads next event from the relay log.  Should be called from the
  slave IO thread.

  @param rli Relay_log_info structure for the slave IO thread.

  @return The event read, or NULL on error.  If an error occurs, the
  error is reported through the sql_print_information() or
  sql_print_error() functions.
*/
5389
static Log_event* next_event(Relay_log_info* rli)
5390 5391 5392
{
  Log_event* ev;
  IO_CACHE* cur_log = rli->cur_log;
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5393
  mysql_mutex_t *log_lock = rli->relay_log.get_log_lock();
5394 5395
  const char* errmsg=0;
  THD* thd = rli->sql_thd;
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5396
  DBUG_ENTER("next_event");
5397

5398 5399
  DBUG_ASSERT(thd != 0);

5400 5401 5402 5403 5404
#ifndef DBUG_OFF
  if (abort_slave_event_count && !rli->events_till_abort--)
    DBUG_RETURN(0);
#endif

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5405 5406
  /*
    For most operations we need to protect rli members with data_lock,
5407 5408 5409
    so we assume calling function acquired this mutex for us and we will
    hold it for the most of the loop below However, we will release it
    whenever it is worth the hassle,  and in the cases when we go into a
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Marc Alff committed
5410
    mysql_cond_wait() with the non-data_lock mutex
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5411
  */
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Marc Alff committed
5412
  mysql_mutex_assert_owner(&rli->data_lock);
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5413

5414
  while (!sql_slave_killed(thd,rli))
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5415 5416 5417
  {
    /*
      We can have two kinds of log reading:
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5418 5419 5420 5421 5422 5423 5424 5425
      hot_log:
        rli->cur_log points at the IO_CACHE of relay_log, which
        is actively being updated by the I/O thread. We need to be careful
        in this case and make sure that we are not looking at a stale log that
        has already been rotated. If it has been, we reopen the log.

      The other case is much simpler:
        We just have a read only log that nobody else will be updating.
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5426
    */
5427 5428 5429 5430
    bool hot_log;
    if ((hot_log = (cur_log != &rli->cache_buf)))
    {
      DBUG_ASSERT(rli->cur_log_fd == -1); // foreign descriptor
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5431
      mysql_mutex_lock(log_lock);
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5432 5433

      /*
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        Reading xxx_file_id is safe because the log will only
        be rotated when we hold relay_log.LOCK_log
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5436
      */
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5437
      if (rli->relay_log.get_open_count() != rli->cur_log_old_open_count)
5438
      {
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5439 5440
        // The master has switched to a new log file; Reopen the old log file
        cur_log=reopen_relay_log(rli, &errmsg);
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Marc Alff committed
5441
        mysql_mutex_unlock(log_lock);
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5442 5443 5444
        if (!cur_log)                           // No more log files
          goto err;
        hot_log=0;                              // Using old binary log
5445 5446
      }
    }
5447 5448 5449 5450 5451 5452 5453
    /* 
      As there is no guarantee that the relay is open (for example, an I/O
      error during a write by the slave I/O thread may have closed it), we
      have to test it.
    */
    if (!my_b_inited(cur_log))
      goto err;
5454 5455
#ifndef DBUG_OFF
    {
5456
      /* This is an assertion which sometimes fails, let's try to track it */
5457
      char llbuf1[22], llbuf2[22];
5458
      DBUG_PRINT("info", ("my_b_tell(cur_log)=%s rli->event_relay_log_pos=%s",
5459
                          llstr(my_b_tell(cur_log),llbuf1),
5460 5461 5462
                          llstr(rli->event_relay_log_pos,llbuf2)));
      DBUG_ASSERT(my_b_tell(cur_log) >= BIN_LOG_HEADER_SIZE);
      DBUG_ASSERT(my_b_tell(cur_log) == rli->event_relay_log_pos);
5463 5464
    }
#endif
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5465 5466
    /*
      Relay log is always in new format - if the master is 3.23, the
5467
      I/O thread will convert the format for us.
5468 5469
      A problem: the description event may be in a previous relay log. So if
      the slave has been shutdown meanwhile, we would have to look in old relay
5470 5471
      logs, which may even have been deleted. So we need to write this
      description event at the beginning of the relay log.
5472 5473
      When the relay log is created when the I/O thread starts, easy: the
      master will send the description event and we will queue it.
5474
      But if the relay log is created by new_file(): then the solution is:
5475
      MYSQL_BIN_LOG::open() will write the buffered description event.
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5476
    */
5477 5478 5479
    if ((ev= Log_event::read_log_event(cur_log,0,
                                       rli->relay_log.description_event_for_exec,
                                       opt_slave_sql_verify_checksum)))
5480

5481 5482
    {
      DBUG_ASSERT(thd==rli->sql_thd);
5483 5484 5485 5486 5487
      /*
        read it while we have a lock, to avoid a mutex lock in
        inc_event_relay_log_pos()
      */
      rli->future_event_relay_log_pos= my_b_tell(cur_log);
5488 5489 5490 5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507 5508
      /*
        For GTID, allocate a new sub_id for the given domain_id.
        The sub_id must be allocated in increasing order of binlog order.
      */
      if (ev->get_type_code() == GTID_EVENT)
      {
        Gtid_log_event *gev= static_cast<Gtid_log_event *>(ev);
        uint64 sub_id= rpl_global_gtid_slave_state.next_subid(gev->domain_id);
        if (!sub_id)
        {
          errmsg = "slave SQL thread aborted because of out-of-memory error";
          if (hot_log)
            mysql_mutex_unlock(log_lock);
          goto err;
        }
        rli->gtid_sub_id= sub_id;
        rli->current_gtid.server_id= gev->server_id;
        rli->current_gtid.domain_id= gev->domain_id;
        rli->current_gtid.seq_no= gev->seq_no;
      }

5509
      if (hot_log)
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5510
        mysql_mutex_unlock(log_lock);
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5511
      DBUG_RETURN(ev);
5512 5513
    }
    DBUG_ASSERT(thd==rli->sql_thd);
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5514
    if (opt_reckless_slave)                     // For mysql-test
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5515
      cur_log->error = 0;
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5516
    if (cur_log->error < 0)
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    {
      errmsg = "slave SQL thread aborted because of I/O error";
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5519
      if (hot_log)
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Marc Alff committed
5520
        mysql_mutex_unlock(log_lock);
unknown's avatar
unknown committed
5521 5522
      goto err;
    }
5523 5524
    if (!cur_log->error) /* EOF */
    {
unknown's avatar
unknown committed
5525
      /*
unknown's avatar
unknown committed
5526 5527 5528
        On a hot log, EOF means that there are no more updates to
        process and we must block until I/O thread adds some and
        signals us to continue
unknown's avatar
unknown committed
5529
      */
5530 5531
      if (hot_log)
      {
5532 5533 5534 5535 5536 5537 5538 5539 5540 5541
        /*
          We say in Seconds_Behind_Master that we have "caught up". Note that
          for example if network link is broken but I/O slave thread hasn't
          noticed it (slave_net_timeout not elapsed), then we'll say "caught
          up" whereas we're not really caught up. Fixing that would require
          internally cutting timeout in smaller pieces in network read, no
          thanks. Another example: SQL has caught up on I/O, now I/O has read
          a new event and is queuing it; the false "0" will exist until SQL
          finishes executing the new event; it will be look abnormal only if
          the events have old timestamps (then you get "many", 0, "many").
5542 5543 5544 5545 5546 5547 5548 5549 5550 5551

          Transient phases like this can be fixed with implemeting
          Heartbeat event which provides the slave the status of the
          master at time the master does not have any new update to send.
          Seconds_Behind_Master would be zero only when master has no
          more updates in binlog for slave. The heartbeat can be sent
          in a (small) fraction of slave_net_timeout. Until it's done
          rli->last_master_timestamp is temporarely (for time of
          waiting for the following event) reset whenever EOF is
          reached.
5552
        */
5553
        time_t save_timestamp= rli->last_master_timestamp;
5554 5555
        rli->last_master_timestamp= 0;

unknown's avatar
unknown committed
5556
        DBUG_ASSERT(rli->relay_log.get_open_count() ==
unknown's avatar
unknown committed
5557
                    rli->cur_log_old_open_count);
5558 5559 5560 5561 5562

        if (rli->ign_master_log_name_end[0])
        {
          /* We generate and return a Rotate, to make our positions advance */
          DBUG_PRINT("info",("seeing an ignored end segment"));
5563
          ev= new Rotate_log_event(rli->ign_master_log_name_end,
5564
                                   0, rli->ign_master_log_pos_end,
unknown's avatar
unknown committed
5565
                                   Rotate_log_event::DUP_NAME);
5566
          rli->ign_master_log_name_end[0]= 0;
Marc Alff's avatar
Marc Alff committed
5567
          mysql_mutex_unlock(log_lock);
5568 5569 5570 5571 5572 5573 5574 5575 5576 5577
          if (unlikely(!ev))
          {
            errmsg= "Slave SQL thread failed to create a Rotate event "
              "(out of memory?), SHOW SLAVE STATUS may be inaccurate";
            goto err;
          }
          ev->server_id= 0; // don't be ignored by slave SQL thread
          DBUG_RETURN(ev);
        }

unknown's avatar
unknown committed
5578 5579 5580 5581
        /*
          We can, and should release data_lock while we are waiting for
          update. If we do not, show slave status will block
        */
Marc Alff's avatar
Marc Alff committed
5582
        mysql_mutex_unlock(&rli->data_lock);
5583 5584

        /*
unknown's avatar
unknown committed
5585
          Possible deadlock :
5586 5587 5588 5589 5590 5591 5592 5593 5594 5595 5596
          - the I/O thread has reached log_space_limit
          - the SQL thread has read all relay logs, but cannot purge for some
          reason:
            * it has already purged all logs except the current one
            * there are other logs than the current one but they're involved in
            a transaction that finishes in the current one (or is not finished)
          Solution :
          Wake up the possibly waiting I/O thread, and set a boolean asking
          the I/O thread to temporarily ignore the log_space_limit
          constraint, because we do not want the I/O thread to block because of
          space (it's ok if it blocks for any other reason (e.g. because the
unknown's avatar
unknown committed
5597
          master does not send anything). Then the I/O thread stops waiting
5598 5599 5600 5601 5602 5603 5604 5605 5606 5607
          and reads one more event and starts honoring log_space_limit again.

          If the SQL thread needs more events to be able to rotate the log (it
          might need to finish the current group first), then it can ask for one
          more at a time. Thus we don't outgrow the relay log indefinitely,
          but rather in a controlled manner, until the next rotate.

          When the SQL thread starts it sets ignore_log_space_limit to false. 
          We should also reset ignore_log_space_limit to 0 when the user does 
          RESET SLAVE, but in fact, no need as RESET SLAVE requires that the slave
unknown's avatar
unknown committed
5608 5609
          be stopped, and the SQL thread sets ignore_log_space_limit to 0 when
          it stops.
5610
        */
Marc Alff's avatar
Marc Alff committed
5611
        mysql_mutex_lock(&rli->log_space_lock);
5612 5613 5614 5615 5616 5617 5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636

        /* 
          If we have reached the limit of the relay space and we
          are going to sleep, waiting for more events:

          1. If outside a group, SQL thread asks the IO thread 
             to force a rotation so that the SQL thread purges 
             logs next time it processes an event (thus space is
             freed).

          2. If in a group, SQL thread asks the IO thread to 
             ignore the limit and queues yet one more event 
             so that the SQL thread finishes the group and 
             is are able to rotate and purge sometime soon.
         */
        if (rli->log_space_limit && 
            rli->log_space_limit < rli->log_space_total)
        {
          /* force rotation if not in an unfinished group */
          rli->sql_force_rotate_relay= !rli->is_in_group();

          /* ask for one more event */
          rli->ignore_log_space_limit= true;
        }

5637
        /*
5638 5639 5640 5641
          If the I/O thread is blocked, unblock it.  Ok to broadcast
          after unlock, because the mutex is only destroyed in
          ~Relay_log_info(), i.e. when rli is destroyed, and rli will
          not be destroyed before we exit the present function.
5642
        */
Marc Alff's avatar
Marc Alff committed
5643 5644
        mysql_mutex_unlock(&rli->log_space_lock);
        mysql_cond_broadcast(&rli->log_space_cond);
Andrei Elkin's avatar
Andrei Elkin committed
5645 5646
        // Note that wait_for_update_relay_log unlocks lock_log !
        rli->relay_log.wait_for_update_relay_log(rli->sql_thd);
5647
        // re-acquire data lock since we released it earlier
Marc Alff's avatar
Marc Alff committed
5648
        mysql_mutex_lock(&rli->data_lock);
5649
        rli->last_master_timestamp= save_timestamp;
unknown's avatar
unknown committed
5650
        continue;
5651
      }
unknown's avatar
unknown committed
5652
      /*
unknown's avatar
unknown committed
5653 5654 5655
        If the log was not hot, we need to move to the next log in
        sequence. The next log could be hot or cold, we deal with both
        cases separately after doing some common initialization
unknown's avatar
unknown committed
5656 5657 5658
      */
      end_io_cache(cur_log);
      DBUG_ASSERT(rli->cur_log_fd >= 0);
Marc Alff's avatar
Marc Alff committed
5659
      mysql_file_close(rli->cur_log_fd, MYF(MY_WME));
unknown's avatar
unknown committed
5660
      rli->cur_log_fd = -1;
unknown's avatar
unknown committed
5661

5662
      if (relay_log_purge)
unknown's avatar
unknown committed
5663
      {
unknown's avatar
unknown committed
5664
        /*
5665 5666 5667 5668 5669 5670 5671 5672 5673 5674
          purge_first_log will properly set up relay log coordinates in rli.
          If the group's coordinates are equal to the event's coordinates
          (i.e. the relay log was not rotated in the middle of a group),
          we can purge this relay log too.
          We do ulonglong and string comparisons, this may be slow but
          - purging the last relay log is nice (it can save 1GB of disk), so we
          like to detect the case where we can do it, and given this,
          - I see no better detection method
          - purge_first_log is not called that often
        */
unknown's avatar
unknown committed
5675
        if (rli->relay_log.purge_first_log
5676 5677 5678
            (rli,
             rli->group_relay_log_pos == rli->event_relay_log_pos
             && !strcmp(rli->group_relay_log_name,rli->event_relay_log_name)))
unknown's avatar
unknown committed
5679 5680 5681 5682
        {
          errmsg = "Error purging processed logs";
          goto err;
        }
unknown's avatar
unknown committed
5683
      }
5684 5685
      else
      {
unknown's avatar
unknown committed
5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701
        /*
          If hot_log is set, then we already have a lock on
          LOCK_log.  If not, we have to get the lock.

          According to Sasha, the only time this code will ever be executed
          is if we are recovering from a bug.
        */
        if (rli->relay_log.find_next_log(&rli->linfo, !hot_log))
        {
          errmsg = "error switching to the next log";
          goto err;
        }
        rli->event_relay_log_pos = BIN_LOG_HEADER_SIZE;
        strmake(rli->event_relay_log_name,rli->linfo.log_file_name,
                sizeof(rli->event_relay_log_name)-1);
        flush_relay_log_info(rli);
unknown's avatar
unknown committed
5702
      }
5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715

      /*
        Now we want to open this next log. To know if it's a hot log (the one
        being written by the I/O thread now) or a cold log, we can use
        is_active(); if it is hot, we use the I/O cache; if it's cold we open
        the file normally. But if is_active() reports that the log is hot, this
        may change between the test and the consequence of the test. So we may
        open the I/O cache whereas the log is now cold, which is nonsense.
        To guard against this, we need to have LOCK_log.
      */

      DBUG_PRINT("info",("hot_log: %d",hot_log));
      if (!hot_log) /* if hot_log, we already have this mutex */
Marc Alff's avatar
Marc Alff committed
5716
        mysql_mutex_lock(log_lock);
unknown's avatar
unknown committed
5717 5718
      if (rli->relay_log.is_active(rli->linfo.log_file_name))
      {
unknown's avatar
unknown committed
5719 5720 5721 5722 5723
        rli->cur_log= cur_log= rli->relay_log.get_log_file();
        rli->cur_log_old_open_count= rli->relay_log.get_open_count();
        DBUG_ASSERT(rli->cur_log_fd == -1);

        /*
5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780
           When the SQL thread is [stopped and] (re)started the
           following may happen:

           1. Log was hot at stop time and remains hot at restart

              SQL thread reads again from hot_log (SQL thread was
              reading from the active log when it was stopped and the
              very same log is still active on SQL thread restart).

              In this case, my_b_seek is performed on cur_log, while
              cur_log points to relay_log.get_log_file();

           2. Log was hot at stop time but got cold before restart

              The log was hot when SQL thread stopped, but it is not
              anymore when the SQL thread restarts.

              In this case, the SQL thread reopens the log, using
              cache_buf, ie, cur_log points to &cache_buf, and thence
              its coordinates are reset.

           3. Log was already cold at stop time

              The log was not hot when the SQL thread stopped, and, of
              course, it will not be hot when it restarts.

              In this case, the SQL thread opens the cold log again,
              using cache_buf, ie, cur_log points to &cache_buf, and
              thence its coordinates are reset.

           4. Log was hot at stop time, DBA changes to previous cold
              log and restarts SQL thread

              The log was hot when the SQL thread was stopped, but the
              user changed the coordinates of the SQL thread to
              restart from a previous cold log.

              In this case, at start time, cur_log points to a cold
              log, opened using &cache_buf as cache, and coordinates
              are reset. However, as it moves on to the next logs, it
              will eventually reach the hot log. If the hot log is the
              same at the time the SQL thread was stopped, then
              coordinates were not reset - the cur_log will point to
              relay_log.get_log_file(), and not a freshly opened
              IO_CACHE through cache_buf. For this reason we need to
              deploy a my_b_seek before calling check_binlog_magic at
              this point of the code (see: BUG#55263 for more
              details).
          
          NOTES: 
            - We must keep the LOCK_log to read the 4 first bytes, as
              this is a hot log (same as when we call read_log_event()
              above: for a hot log we take the mutex).

            - Because of scenario #4 above, we need to have a
              my_b_seek here. Otherwise, we might hit the assertion
              inside check_binlog_magic.
unknown's avatar
unknown committed
5781
        */
5782 5783

        my_b_seek(cur_log, (my_off_t) 0);
unknown's avatar
unknown committed
5784
        if (check_binlog_magic(cur_log,&errmsg))
5785
        {
Marc Alff's avatar
Marc Alff committed
5786 5787
          if (!hot_log)
            mysql_mutex_unlock(log_lock);
unknown's avatar
unknown committed
5788
          goto err;
5789
        }
Marc Alff's avatar
Marc Alff committed
5790 5791
        if (!hot_log)
          mysql_mutex_unlock(log_lock);
unknown's avatar
unknown committed
5792
        continue;
5793
      }
Marc Alff's avatar
Marc Alff committed
5794 5795
      if (!hot_log)
        mysql_mutex_unlock(log_lock);
unknown's avatar
unknown committed
5796
      /*
unknown's avatar
unknown committed
5797 5798 5799
        if we get here, the log was not hot, so we will have to open it
        ourselves. We are sure that the log is still not hot now (a log can get
        from hot to cold, but not from cold to hot). No need for LOCK_log.
unknown's avatar
unknown committed
5800 5801 5802
      */
      // open_binlog() will check the magic header
      if ((rli->cur_log_fd=open_binlog(cur_log,rli->linfo.log_file_name,
unknown's avatar
unknown committed
5803 5804
                                       &errmsg)) <0)
        goto err;
5805
    }
unknown's avatar
unknown committed
5806
    else
5807
    {
unknown's avatar
unknown committed
5808
      /*
unknown's avatar
unknown committed
5809 5810
        Read failed with a non-EOF error.
        TODO: come up with something better to handle this error
unknown's avatar
unknown committed
5811 5812
      */
      if (hot_log)
Marc Alff's avatar
Marc Alff committed
5813
        mysql_mutex_unlock(log_lock);
5814
      sql_print_error("Slave SQL thread: I/O error reading \
unknown's avatar
unknown committed
5815
event(errno: %d  cur_log->error: %d)",
unknown's avatar
unknown committed
5816
                      my_errno,cur_log->error);
unknown's avatar
unknown committed
5817
      // set read position to the beginning of the event
5818
      my_b_seek(cur_log,rli->event_relay_log_pos);
unknown's avatar
unknown committed
5819 5820
      /* otherwise, we have had a partial read */
      errmsg = "Aborting slave SQL thread because of partial event read";
unknown's avatar
unknown committed
5821
      break;                                    // To end of function
5822 5823
    }
  }
5824
  if (!errmsg && global_system_variables.log_warnings)
5825
  {
unknown's avatar
unknown committed
5826
    sql_print_information("Error reading relay log event: %s",
5827 5828 5829
                          "slave SQL thread was killed");
    DBUG_RETURN(0);
  }
unknown's avatar
unknown committed
5830

5831
err:
5832 5833
  if (errmsg)
    sql_print_error("Error reading relay log event: %s", errmsg);
unknown's avatar
unknown committed
5834
  DBUG_RETURN(0);
5835 5836
}

5837 5838 5839
/*
  Rotate a relay log (this is used only by FLUSH LOGS; the automatic rotation
  because of size is simpler because when we do it we already have all relevant
unknown's avatar
unknown committed
5840
  locks; here we don't, so this function is mainly taking locks).
5841 5842
  Returns nothing as we cannot catch any error (MYSQL_BIN_LOG::new_file()
  is void).
5843 5844
*/

5845
int rotate_relay_log(Master_info* mi)
5846 5847
{
  DBUG_ENTER("rotate_relay_log");
5848
  Relay_log_info* rli= &mi->rli;
5849
  int error= 0;
unknown's avatar
unknown committed
5850

Luis Soares's avatar
Luis Soares committed
5851
  DBUG_EXECUTE_IF("crash_before_rotate_relaylog", DBUG_SUICIDE(););
5852

unknown's avatar
unknown committed
5853
  /*
unknown's avatar
unknown committed
5854 5855 5856
     We need to test inited because otherwise, new_file() will attempt to lock
     LOCK_log, which may not be inited (if we're not a slave).
  */
5857 5858
  if (!rli->inited)
  {
unknown's avatar
unknown committed
5859
    DBUG_PRINT("info", ("rli->inited == 0"));
unknown's avatar
unknown committed
5860
    goto end;
5861
  }
unknown's avatar
unknown committed
5862

5863
  /* If the relay log is closed, new_file() will do nothing. */
5864 5865
  if ((error= rli->relay_log.new_file()))
    goto end;
unknown's avatar
unknown committed
5866

5867 5868 5869 5870
  /*
    We harvest now, because otherwise BIN_LOG_HEADER_SIZE will not immediately
    be counted, so imagine a succession of FLUSH LOGS  and assume the slave
    threads are started:
unknown's avatar
unknown committed
5871 5872 5873 5874 5875 5876
    relay_log_space decreases by the size of the deleted relay log, but does
    not increase, so flush-after-flush we may become negative, which is wrong.
    Even if this will be corrected as soon as a query is replicated on the
    slave (because the I/O thread will then call harvest_bytes_written() which
    will harvest all these BIN_LOG_HEADER_SIZE we forgot), it may give strange
    output in SHOW SLAVE STATUS meanwhile. So we harvest now.
5877 5878
    If the log is closed, then this will just harvest the last writes, probably
    0 as they probably have been harvested.
Sergei Golubchik's avatar
Sergei Golubchik committed
5879 5880

    Note that it needs to be protected by mi->data_lock.
5881
  */
Sergei Golubchik's avatar
Sergei Golubchik committed
5882
  mysql_mutex_assert_owner(&mi->data_lock);
5883
  rli->relay_log.harvest_bytes_written(&rli->log_space_total);
unknown's avatar
unknown committed
5884
end:
5885
  DBUG_RETURN(error);
5886 5887
}

unknown's avatar
unknown committed
5888

unknown's avatar
unknown committed
5889 5890 5891
/**
   Detects, based on master's version (as found in the relay log), if master
   has a certain bug.
5892
   @param rli Relay_log_info which tells the master's version
unknown's avatar
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5893
   @param bug_id Number of the bug as found in bugs.mysql.com
5894
   @param report bool report error message, default TRUE
5895 5896 5897 5898 5899 5900 5901

   @param pred Predicate function that will be called with @c param to
   check for the bug. If the function return @c true, the bug is present,
   otherwise, it is not.

   @param param  State passed to @c pred function.

unknown's avatar
unknown committed
5902 5903
   @return TRUE if master has the bug, FALSE if it does not.
*/
5904 5905
bool rpl_master_has_bug(const Relay_log_info *rli, uint bug_id, bool report,
                        bool (*pred)(const void *), const void *param)
unknown's avatar
unknown committed
5906 5907 5908 5909 5910 5911 5912 5913
{
  struct st_version_range_for_one_bug {
    uint        bug_id;
    const uchar introduced_in[3]; // first version with bug
    const uchar fixed_in[3];      // first version with fix
  };
  static struct st_version_range_for_one_bug versions_for_all_bugs[]=
  {
unknown's avatar
unknown committed
5914
    {24432, { 5, 0, 24 }, { 5, 0, 38 } },
5915 5916 5917
    {24432, { 5, 1, 12 }, { 5, 1, 17 } },
    {33029, { 5, 0,  0 }, { 5, 0, 58 } },
    {33029, { 5, 1,  0 }, { 5, 1, 12 } },
5918
    {37426, { 5, 1,  0 }, { 5, 1, 26 } },
unknown's avatar
unknown committed
5919 5920
  };
  const uchar *master_ver=
5921
    rli->relay_log.description_event_for_exec->server_version_split.ver;
unknown's avatar
unknown committed
5922

5923
  DBUG_ASSERT(sizeof(rli->relay_log.description_event_for_exec->server_version_split.ver) == 3);
unknown's avatar
unknown committed
5924 5925 5926 5927 5928 5929 5930 5931

  for (uint i= 0;
       i < sizeof(versions_for_all_bugs)/sizeof(*versions_for_all_bugs);i++)
  {
    const uchar *introduced_in= versions_for_all_bugs[i].introduced_in,
      *fixed_in= versions_for_all_bugs[i].fixed_in;
    if ((versions_for_all_bugs[i].bug_id == bug_id) &&
        (memcmp(introduced_in, master_ver, 3) <= 0) &&
5932 5933
        (memcmp(fixed_in,      master_ver, 3) >  0) &&
        (pred == NULL || (*pred)(param)))
unknown's avatar
unknown committed
5934
    {
5935 5936
      if (!report)
	return TRUE;
unknown's avatar
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5937 5938 5939 5940 5941
      // a short message for SHOW SLAVE STATUS (message length constraints)
      my_printf_error(ER_UNKNOWN_ERROR, "master may suffer from"
                      " http://bugs.mysql.com/bug.php?id=%u"
                      " so slave stops; check error log on slave"
                      " for more info", MYF(0), bug_id);
5942
      // a verbose message for the error log
5943 5944 5945
      rli->report(ERROR_LEVEL, ER_UNKNOWN_ERROR,
                  "According to the master's version ('%s'),"
                  " it is probable that master suffers from this bug:"
5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961
                      " http://bugs.mysql.com/bug.php?id=%u"
                      " and thus replicating the current binary log event"
                      " may make the slave's data become different from the"
                      " master's data."
                      " To take no risk, slave refuses to replicate"
                      " this event and stops."
                      " We recommend that all updates be stopped on the"
                      " master and slave, that the data of both be"
                      " manually synchronized,"
                      " that master's binary logs be deleted,"
                      " that master be upgraded to a version at least"
                      " equal to '%d.%d.%d'. Then replication can be"
                      " restarted.",
                      rli->relay_log.description_event_for_exec->server_version,
                      bug_id,
                      fixed_in[0], fixed_in[1], fixed_in[2]);
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5962 5963 5964 5965 5966 5967
      return TRUE;
    }
  }
  return FALSE;
}

5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979
/**
   BUG#33029, For all 5.0 up to 5.0.58 exclusive, and 5.1 up to 5.1.12
   exclusive, if one statement in a SP generated AUTO_INCREMENT value
   by the top statement, all statements after it would be considered
   generated AUTO_INCREMENT value by the top statement, and a
   erroneous INSERT_ID value might be associated with these statement,
   which could cause duplicate entry error and stop the slave.

   Detect buggy master to work around.
 */
bool rpl_master_erroneous_autoinc(THD *thd)
{
5980
  if (thd->rli_slave)
5981
  {
5982
    DBUG_EXECUTE_IF("simulate_bug33029", return TRUE;);
5983
    return rpl_master_has_bug(thd->rli_slave, 33029, FALSE, NULL, NULL);
5984 5985 5986 5987
  }
  return FALSE;
}

5988 5989 5990 5991
/**
  @} (end of group Replication)
*/

unknown's avatar
SCRUM  
unknown committed
5992
#endif /* HAVE_REPLICATION */