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/* Copyright (C) 2000-2003 MySQL 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
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 "mysql_priv.h"
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#include <mysql.h>
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#include <myisam.h>
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#include "slave.h"
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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 <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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#ifdef HAVE_REPLICATION

#include "rpl_tblmap.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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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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typedef bool (*CHECK_KILLED_FUNC)(THD*,void*);

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char* slave_load_tmpdir = 0;
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Master_info *active_mi= 0;
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my_bool replicate_same_server_id;
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ulonglong relay_log_space_limit = 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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int events_till_abort = -1;
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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, \
log '%s' at postion %s",
    "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",
    "failed dump request, reconnecting to try again, log '%s' at postion %s",
    "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, \
log '%s' at postion %s",
    "",
    "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, 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 int safe_sleep(THD* thd, int sec, CHECK_KILLED_FUNC thread_killed,
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                      void* thread_killed_arg);
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static int request_table_dump(MYSQL* mysql, const char* db, const char* table);
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static int create_table_from_dump(THD* thd, MYSQL *mysql, const char* db,
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                                  const char* table_name, bool overwrite);
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static int get_master_version_and_clock(MYSQL* mysql, Master_info* mi);
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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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                                  pthread_mutex_t *term_lock,
                                  pthread_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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/*
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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
  pthread_mutex_lock(&mi->run_lock);
  pthread_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
  pthread_mutex_unlock(&mi->rli.run_lock);
  pthread_mutex_unlock(&mi->run_lock);
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  DBUG_VOID_RETURN;
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}

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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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  /*
    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.
  */
  pthread_mutex_lock(&LOCK_active_mi);
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  /*
    TODO: re-write this to interate through the list of files
    for multi-master
  */
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  active_mi= new Master_info;
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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 (!active_mi)
  {
    sql_print_error("Failed to allocate memory for the master info structure");
    goto err;
  }
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  if (init_master_info(active_mi,master_info_file,relay_log_info_file,
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                       !master_host, (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 && !master_host && active_mi->host[0])
    master_host= active_mi->host;

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  /* If server id is not set, start_slave_thread() will say it */

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  if (master_host && !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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  pthread_mutex_unlock(&LOCK_active_mi);
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  DBUG_RETURN(0);
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err:
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  pthread_mutex_unlock(&LOCK_active_mi);
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  DBUG_RETURN(1);
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}
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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

  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);
  pthread_mutex_t *sql_lock = &mi->rli.run_lock, *io_lock = &mi->run_lock;
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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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  }
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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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  }
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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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                       pthread_mutex_t *term_lock,
                       pthread_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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  {
    pthread_mutex_lock(term_lock);
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  }
  else
  {
    safe_mutex_assert_owner(term_lock);
  }
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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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      pthread_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;
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    DBUG_PRINT("loop", ("killing slave thread"));
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    pthread_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)
    */
    IF_DBUG(int err= ) pthread_kill(thd->real_id, thr_client_alarm);
    DBUG_ASSERT(err != EINVAL);
#endif
    thd->awake(THD::NOT_KILLED);
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    pthread_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= pthread_cond_timedwait(term_cond, term_lock, &abstime);
    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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    pthread_mutex_unlock(term_lock);
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  DBUG_RETURN(0);
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}

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int start_slave_thread(pthread_handler h_func, pthread_mutex_t *start_lock,
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                       pthread_mutex_t *cond_lock,
                       pthread_cond_t *start_cond,
                       volatile uint *slave_running,
                       volatile ulong *slave_run_id,
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                       Master_info* mi,
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                       bool high_priority)
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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)
    pthread_mutex_lock(start_lock);
  if (!server_id)
  {
    if (start_cond)
      pthread_cond_broadcast(start_cond);
    if (start_lock)
      pthread_mutex_unlock(start_lock);
    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)
      pthread_cond_broadcast(start_cond);
    if (start_lock)
      pthread_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 (high_priority)
    my_pthread_attr_setprio(&connection_attrib,CONNECT_PRIOR);
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  if (pthread_create(&th, &connection_attrib, h_func, (void*)mi))
  {
    if (start_lock)
      pthread_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,
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                                            "Waiting for slave thread to start");
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      pthread_cond_wait(start_cond,cond_lock);
      thd->exit_cond(old_msg);
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      pthread_mutex_lock(cond_lock); // re-acquire it as exit_cond() released
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      if (thd->killed)
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        DBUG_RETURN(thd->killed_errno());
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    }
  }
  if (start_lock)
    pthread_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,
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                        Master_info* mi, const char* master_info_fname,
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                        const char* slave_info_fname, int thread_mask)
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{
  pthread_mutex_t *lock_io=0,*lock_sql=0,*lock_cond_io=0,*lock_cond_sql=0;
  pthread_cond_t* cond_io=0,*cond_sql=0;
  int error=0;
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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 (thread_mask & SLAVE_IO)
    error=start_slave_thread(handle_slave_io,lock_io,lock_cond_io,
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                             cond_io,
                             &mi->slave_running, &mi->slave_run_id,
                             mi, 1); //high priority, to read the most possible
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  if (!error && (thread_mask & SLAVE_SQL))
648
  {
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    error=start_slave_thread(handle_slave_sql,lock_sql,lock_cond_sql,
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                             cond_sql,
                             &mi->rli.slave_running, &mi->rli.slave_run_id,
                             mi, 0);
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    if (error)
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      terminate_slave_threads(mi, thread_mask & SLAVE_IO, !need_slave_mutex);
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  }
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  DBUG_RETURN(error);
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}
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#ifdef NOT_USED_YET
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static int end_slave_on_walk(Master_info* mi, uchar* /*unused*/)
662
{
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  DBUG_ENTER("end_slave_on_walk");

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  end_master_info(mi);
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  DBUG_RETURN(0);
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}
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#endif
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/*
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  Release slave threads at time of executing shutdown.
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  SYNOPSIS
    end_slave()
*/
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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.
  */
  pthread_mutex_lock(&LOCK_active_mi);
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  if (active_mi)
  {
    /*
      TODO: replace the line below with
      list_walk(&master_list, (list_walk_action)end_slave_on_walk,0);
      once multi-master code is ready.
    */
    terminate_slave_threads(active_mi,SLAVE_FORCE_ALL);
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  }
  pthread_mutex_unlock(&LOCK_active_mi);
  DBUG_VOID_RETURN;
}

/**
   Free all resources used by slave threads at time of executing shutdown.
   The routine must be called after all possible users of @c active_mi
   have left.

   SYNOPSIS
     close_active_mi()

*/
void close_active_mi()
{
  pthread_mutex_lock(&LOCK_active_mi);
  if (active_mi)
  {
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    end_master_info(active_mi);
    delete active_mi;
    active_mi= 0;
  }
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  pthread_mutex_unlock(&LOCK_active_mi);
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}
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static bool io_slave_killed(THD* thd, Master_info* mi)
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{
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  DBUG_ENTER("io_slave_killed");

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

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static bool sql_slave_killed(THD* thd, Relay_log_info* rli)
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{
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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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    if (rli->abort_slave && rli->is_in_group() &&
        thd->transaction.all.modified_non_trans_table)
      DBUG_RETURN(0);
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    /*
      If we are in an unsafe situation (stopping could corrupt replication),
      we give one minute to the slave SQL thread of grace before really
      terminating, in the hope that it will be able to read more events and
      the unsafe situation will soon be left. Note that this one minute starts
      from the last time anything happened in the slave SQL thread. So it's
      really one minute of idleness, we don't timeout if the slave SQL thread
      is actively working.
    */
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    if (rli->last_event_start_time == 0)
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      DBUG_RETURN(1);
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    DBUG_PRINT("info", ("Slave SQL thread is in an unsafe situation, giving "
                        "it some grace period"));
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    if (difftime(time(0), rli->last_event_start_time) > 60)
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    {
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      rli->report(ERROR_LEVEL, 0,
                  "SQL thread had to stop in an unsafe situation, in "
                  "the middle of applying updates to a "
                  "non-transactional table without any primary key. "
                  "There is a risk of duplicate updates when the slave "
                  "SQL thread is restarted. Please check your tables' "
                  "contents after restart.");
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      DBUG_RETURN(1);
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    }
  }
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  DBUG_RETURN(0);
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}

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/*
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  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");

785
  (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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bool net_request_file(NET* net, const char* fname)
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{
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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)
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{
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  DBUG_ENTER("*print_slave_db_safe");

  DBUG_RETURN((db ? db : ""));
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}
812

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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;
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      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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}

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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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/*
  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 ||
      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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*/
900

901
static int get_master_version_and_clock(MYSQL* mysql, Master_info* mi)
902
{
903
  char err_buff[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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  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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917
  if (!my_isdigit(&my_charset_bin,*mysql->server_version))
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  {
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    errmsg = "Master reported unrecognized MySQL version";
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    err_code= ER_SLAVE_FATAL_ERROR;
    sprintf(err_buff, ER(err_code), errmsg);
  }
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  else
  {
    /*
      Note the following switch will bug when we have MySQL branch 30 ;)
    */
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    switch (*mysql->server_version)
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    {
    case '0':
    case '1':
    case '2':
      errmsg = "Master reported unrecognized MySQL version";
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      err_code= ER_SLAVE_FATAL_ERROR;
      sprintf(err_buff, ER(err_code), errmsg);
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      break;
    case '3':
      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;
    case '4':
      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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967
  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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  /*
    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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984 985
  DBUG_SYNC_POINT("debug_lock.before_get_UNIX_TIMESTAMP", 10);
  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=
991
      (long) (time((time_t*) 0) - strtoul(master_row[0], 0, 10));
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  }
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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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  {
1001
    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)
1008
  {
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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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  DBUG_SYNC_POINT("debug_lock.before_get_SERVER_ID", 10);
  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)))
1030
  {
1031
    if ((::server_id == strtoul(master_row[1], 0, 10)) &&
1032
        !mi->rli.replicate_same_server_id)
1033
    {
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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;
1041
    }
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  }
  else if (mysql_errno(mysql))
  {
    if (is_network_error(mysql_errno(mysql)))
    {
      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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  /*
    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 */
  if (*mysql->server_version == '3')
1089
    goto err;
1090

1091
  if (*mysql->server_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;
      }
1108
    }
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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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  }
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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).
1151
  */
1152
  if (*mysql->server_version == '4')
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  {
1154 1155 1156 1157
    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)))
1158
    {
1159 1160 1161 1162
      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 \
1163
different values for the TIME_ZONE global variable. The values must \
1164 1165 1166 1167 1168
be equal for the Statement-format replication to work";
        err_code= ER_SLAVE_FATAL_ERROR;
        sprintf(err_buff, ER(err_code), errmsg);
        goto err;
      }
1169
    }
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182
    else if (is_network_error(mysql_errno(mysql)))
    {
      mi->report(WARNING_LEVEL, mysql_errno(mysql),
                 "Get master TIME_ZONE 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 try to get the value of TIME_ZONE global variable from master.";
      err_code= mysql_errno(mysql);
      sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
1183
      goto err;
1184 1185 1186 1187 1188 1189
    }
    if (master_res)
    {
      mysql_free_result(master_res);
      master_res= NULL;
    }
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  }

1192
err:
1193 1194
  if (errmsg)
  {
1195 1196
    if (master_res)
      mysql_free_result(master_res);
1197
    DBUG_ASSERT(err_code != 0);
1198
    mi->report(ERROR_LEVEL, err_code, "%s", err_buff);
1199
    DBUG_RETURN(1);
1200
  }
1201

1202
  DBUG_RETURN(0);
1203 1204 1205 1206 1207

network_err:
  if (master_res)
    mysql_free_result(master_res);
  DBUG_RETURN(2);
1208 1209
}

1210 1211 1212 1213
/*
  Used by fetch_master_table (used by LOAD TABLE tblname FROM MASTER and LOAD
  DATA FROM MASTER). Drops the table (if 'overwrite' is true) and recreates it
  from the dump. Honours replication inclusion/exclusion rules.
1214
  db must be non-zero (guarded by assertion).
1215 1216 1217 1218 1219

  RETURN VALUES
    0           success
    1           error
*/
1220

1221
static int create_table_from_dump(THD* thd, MYSQL *mysql, const char* db,
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                                  const char* table_name, bool overwrite)
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{
1224
  ulong packet_len;
1225 1226
  char *query, *save_db;
  uint32 save_db_length;
1227 1228
  Vio* save_vio;
  HA_CHECK_OPT check_opt;
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1229
  TABLE_LIST tables;
1230 1231
  int error= 1;
  handler *file;
1232
  ulonglong save_options;
1233
  NET *net= &mysql->net;
1234
  const char *found_semicolon= NULL;
1235
  DBUG_ENTER("create_table_from_dump");
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1236

1237
  packet_len= my_net_read(net); // read create table statement
1238 1239
  if (packet_len == packet_error)
  {
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    my_message(ER_MASTER_NET_READ, ER(ER_MASTER_NET_READ), MYF(0));
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    DBUG_RETURN(1);
1242 1243 1244
  }
  if (net->read_pos[0] == 255) // error from master
  {
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    char *err_msg;
1246
    err_msg= (char*) net->read_pos + ((mysql->server_capabilities &
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                                       CLIENT_PROTOCOL_41) ?
                                      3+SQLSTATE_LENGTH+1 : 3);
1249
    my_error(ER_MASTER, MYF(0), err_msg);
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    DBUG_RETURN(1);
1251
  }
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1252
  thd->command = COM_TABLE_DUMP;
1253
  if (!(query = thd->strmake((char*) net->read_pos, packet_len)))
1254 1255
  {
    sql_print_error("create_table_from_dump: out of memory");
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    my_message(ER_GET_ERRNO, "Out of memory", MYF(0));
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1257
    DBUG_RETURN(1);
1258
  }
1259
  thd->set_query(query, packet_len);
1260
  thd->is_slave_error = 0;
1261

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1262 1263
  bzero((char*) &tables,sizeof(tables));
  tables.db = (char*)db;
1264
  tables.alias= tables.table_name= (char*)table_name;
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1265

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  /* Drop the table if 'overwrite' is true */
1267
  if (overwrite)
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  {
1269 1270 1271 1272 1273 1274 1275 1276 1277 1278
    if (mysql_rm_table(thd,&tables,1,0)) /* drop if exists */
    {
      sql_print_error("create_table_from_dump: failed to drop the table");
      goto err;
    }
    else
    {
      /* Clear the OK result of mysql_rm_table(). */
      thd->main_da.reset_diagnostics_area();
    }
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  }

1281
  /* Create the table. We do not want to log the "create table" statement */
1282
  save_options = thd->options;
1283 1284
  thd->options &= ~ (OPTION_BIN_LOG);
  thd_proc_info(thd, "Creating table from master dump");
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  // save old db in case we are creating in a different database
1286
  save_db = thd->db;
1287
  save_db_length= thd->db_length;
1288
  thd->db = (char*)db;
1289
  DBUG_ASSERT(thd->db != 0);
1290
  thd->db_length= strlen(thd->db);
1291 1292
  /* run create table */
  mysql_parse(thd, thd->query(), packet_len, &found_semicolon);
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1293
  thd->db = save_db;            // leave things the way the were before
1294
  thd->db_length= save_db_length;
1295
  thd->options = save_options;
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1296

1297
  if (thd->is_slave_error)
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    goto err;                   // mysql_parse took care of the error send
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1300
  thd_proc_info(thd, "Opening master dump table");
1301
  thd->main_da.reset_diagnostics_area(); /* cleanup from CREATE_TABLE */
1302 1303 1304 1305 1306 1307
  /*
    Note: If this function starts to fail for MERGE tables,
    change the next two lines to these:
    tables.table= NULL; // was set by mysql_rm_table()
    if (!open_n_lock_single_table(thd, &tables, TL_WRITE))
  */
1308
  tables.lock_type = TL_WRITE;
1309
  if (!open_ltable(thd, &tables, TL_WRITE, 0))
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1310 1311
  {
    sql_print_error("create_table_from_dump: could not open created table");
1312
    goto err;
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  }
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1314

1315
  file = tables.table->file;
1316
  thd_proc_info(thd, "Reading master dump table data");
1317
  /* Copy the data file */
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1318 1319
  if (file->net_read_dump(net))
  {
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    my_message(ER_MASTER_NET_READ, ER(ER_MASTER_NET_READ), MYF(0));
1321
    sql_print_error("create_table_from_dump: failed in\
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1322
 handler::net_read_dump()");
1323
    goto err;
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1324
  }
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1325 1326

  check_opt.init();
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1327
  check_opt.flags|= T_VERY_SILENT | T_CALC_CHECKSUM | T_QUICK;
1328
  thd_proc_info(thd, "Rebuilding the index on master dump table");
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1329 1330 1331 1332 1333
  /*
    We do not want repair() to spam us with messages
    just send them to the error log, and report the failure in case of
    problems.
  */
1334
  save_vio = thd->net.vio;
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  thd->net.vio = 0;
1336
  /* Rebuild the index file from the copied data file (with REPAIR) */
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  error=file->ha_repair(thd,&check_opt) != 0;
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1338
  thd->net.vio = save_vio;
1339
  if (error)
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    my_error(ER_INDEX_REBUILD, MYF(0), tables.table->s->table_name.str);
1341 1342

err:
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1343
  close_thread_tables(thd);
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  DBUG_RETURN(error);
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}

1347

1348
int fetch_master_table(THD *thd, const char *db_name, const char *table_name,
1349
                       Master_info *mi, MYSQL *mysql, bool overwrite)
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1350
{
1351 1352 1353 1354 1355
  int error= 1;
  const char *errmsg=0;
  bool called_connected= (mysql != NULL);
  DBUG_ENTER("fetch_master_table");
  DBUG_PRINT("enter", ("db_name: '%s'  table_name: '%s'",
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                       db_name,table_name));
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1357

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merge  
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1358
  if (!called_connected)
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1359
  {
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SCRUM  
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1360
    if (!(mysql = mysql_init(NULL)))
1361 1362 1363
    {
      DBUG_RETURN(1);
    }
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merge  
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1364
    if (connect_to_master(thd, mysql, mi))
1365
    {
1366
      my_error(ER_CONNECT_TO_MASTER, MYF(0), mysql_error(mysql));
1367 1368 1369 1370 1371 1372 1373 1374 1375
      /*
        We need to clear the active VIO since, theoretically, somebody
        might issue an awake() on this thread.  If we are then in the
        middle of closing and destroying the VIO inside the
        mysql_close(), we will have a problem.
       */
#ifdef SIGNAL_WITH_VIO_CLOSE
      thd->clear_active_vio();
#endif
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1376
      mysql_close(mysql);
1377
      DBUG_RETURN(1);
1378
    }
1379 1380
    if (thd->killed)
      goto err;
1381
  }
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1382

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1383
  if (request_table_dump(mysql, db_name, table_name))
1384
  {
1385 1386
    error= ER_UNKNOWN_ERROR;
    errmsg= "Failed on table dump request";
1387 1388
    goto err;
  }
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1389
  if (create_table_from_dump(thd, mysql, db_name,
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                             table_name, overwrite))
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    goto err;    // create_table_from_dump have sent the error already
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1392
  error = 0;
1393

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 err:
1395
  if (!called_connected)
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1396
    mysql_close(mysql);
1397
  if (errmsg && thd->vio_ok())
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1398
    my_message(error, errmsg, MYF(0));
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1399
  DBUG_RETURN(test(error));                     // Return 1 on error
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1400
}
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1401

1402

1403
static bool wait_for_relay_log_space(Relay_log_info* rli)
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1404
{
1405
  bool slave_killed=0;
1406
  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");
1410

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1411
  pthread_mutex_lock(&rli->log_space_lock);
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1412
  save_proc_info= thd->enter_cond(&rli->log_space_cond,
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1413 1414
                                  &rli->log_space_lock,
                                  "\
1415
Waiting for the slave SQL thread to free enough relay log space");
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1416
  while (rli->log_space_limit < rli->log_space_total &&
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1417
         !(slave_killed=io_slave_killed(thd,mi)) &&
1418
         !rli->ignore_log_space_limit)
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1419
    pthread_cond_wait(&rli->log_space_cond, &rli->log_space_lock);
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1420
  thd->exit_cond(save_proc_info);
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1421 1422
  DBUG_RETURN(slave_killed);
}
1423

1424

1425 1426
/*
  Builds a Rotate from the ignored events' info and writes it to relay log.
1427

1428 1429 1430 1431 1432 1433 1434 1435 1436 1437
  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).
 */
1438
static void write_ignored_events_info_to_relay_log(THD *thd, Master_info *mi)
1439
{
1440
  Relay_log_info *rli= &mi->rli;
1441
  pthread_mutex_t *log_lock= rli->relay_log.get_log_lock();
1442 1443
  DBUG_ENTER("write_ignored_events_info_to_relay_log");

1444 1445 1446
  DBUG_ASSERT(thd == mi->io_thd);
  pthread_mutex_lock(log_lock);
  if (rli->ign_master_log_name_end[0])
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1447
  {
1448
    DBUG_PRINT("info",("writing a Rotate event to track down ignored events"));
1449
    Rotate_log_event *ev= new Rotate_log_event(rli->ign_master_log_name_end,
1450 1451 1452 1453 1454 1455 1456 1457 1458
                                               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 */
    pthread_mutex_unlock(log_lock);
    if (likely((bool)ev))
    {
      ev->server_id= 0; // don't be ignored by slave SQL thread
      if (unlikely(rli->relay_log.append(ev)))
1459 1460 1461 1462 1463
        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");
1464
      rli->relay_log.harvest_bytes_written(&rli->log_space_total);
1465 1466
      if (flush_master_info(mi, 1))
        sql_print_error("Failed to flush master info file");
1467 1468 1469
      delete ev;
    }
    else
1470 1471 1472 1473
      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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1474
  }
1475 1476
  else
    pthread_mutex_unlock(log_lock);
1477
  DBUG_VOID_RETURN;
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1478 1479
}

1480

1481
int register_slave_on_master(MYSQL* mysql, Master_info *mi,
1482
                             bool *suppress_warnings)
1483
{
1484
  uchar buf[1024], *pos= buf;
1485
  uint report_host_len, report_user_len=0, report_password_len=0;
1486
  DBUG_ENTER("register_slave_on_master");
1487

1488
  *suppress_warnings= FALSE;
1489
  if (!report_host)
1490
    DBUG_RETURN(0);
1491
  report_host_len= strlen(report_host);
1492
  if (report_user)
1493
    report_user_len= strlen(report_user);
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1494
  if (report_password)
1495 1496 1497 1498
    report_password_len= strlen(report_password);
  /* 30 is a good safety margin */
  if (report_host_len + report_user_len + report_password_len + 30 >
      sizeof(buf))
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    DBUG_RETURN(0);                                     // safety
1500 1501

  int4store(pos, server_id); pos+= 4;
1502 1503 1504
  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);
1505
  int2store(pos, (uint16) report_port); pos+= 2;
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1506
  int4store(pos, rpl_recovery_rank);    pos+= 4;
1507
  /* The master will fill in master_id */
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1508
  int4store(pos, 0);                    pos+= 4;
1509

1510
  if (simple_command(mysql, COM_REGISTER_SLAVE, buf, (size_t) (pos- buf), 0))
1511
  {
1512 1513 1514 1515
    if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
    {
      *suppress_warnings= TRUE;                 // Suppress reconnect warning
    }
1516
    else if (!check_io_slave_killed(mi->io_thd, mi, NULL))
1517 1518 1519 1520 1521 1522 1523
    {
      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);
    }
1524
    DBUG_RETURN(1);
1525
  }
1526
  DBUG_RETURN(0);
1527 1528
}

1529

1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540
/**
  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
*/
1541
bool show_master_info(THD* thd, Master_info* mi)
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1542
{
1543
  // TODO: fix this for multi-master
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1544
  List<Item> field_list;
1545 1546 1547
  Protocol *protocol= thd->protocol;
  DBUG_ENTER("show_master_info");

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  field_list.push_back(new Item_empty_string("Slave_IO_State",
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                                                     14));
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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)));
1554
  field_list.push_back(new Item_return_int("Master_Port", 7,
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                                           MYSQL_TYPE_LONG));
1556
  field_list.push_back(new Item_return_int("Connect_Retry", 10,
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                                           MYSQL_TYPE_LONG));
1558
  field_list.push_back(new Item_empty_string("Master_Log_File",
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                                             FN_REFLEN));
1560
  field_list.push_back(new Item_return_int("Read_Master_Log_Pos", 10,
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                                           MYSQL_TYPE_LONGLONG));
1562
  field_list.push_back(new Item_empty_string("Relay_Log_File",
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                                             FN_REFLEN));
1564
  field_list.push_back(new Item_return_int("Relay_Log_Pos", 10,
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                                           MYSQL_TYPE_LONGLONG));
1566
  field_list.push_back(new Item_empty_string("Relay_Master_Log_File",
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                                             FN_REFLEN));
1568 1569
  field_list.push_back(new Item_empty_string("Slave_IO_Running", 3));
  field_list.push_back(new Item_empty_string("Slave_SQL_Running", 3));
1570 1571 1572 1573 1574 1575
  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));
1577 1578 1579
  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));
1581
  field_list.push_back(new Item_return_int("Exec_Master_Log_Pos", 10,
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                                           MYSQL_TYPE_LONGLONG));
1583
  field_list.push_back(new Item_return_int("Relay_Log_Space", 10,
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                                           MYSQL_TYPE_LONGLONG));
1585
  field_list.push_back(new Item_empty_string("Until_Condition", 6));
1586
  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,
1588
                                           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)));
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  field_list.push_back(new Item_return_int("Seconds_Behind_Master", 10,
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                                           MYSQL_TYPE_LONGLONG));
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  field_list.push_back(new Item_empty_string("Master_SSL_Verify_Server_Cert",
                                             3));
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  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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  if (protocol->send_fields(&field_list,
                            Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
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    DBUG_RETURN(TRUE);
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1613 1614
  if (mi->host[0])
  {
1615
    DBUG_PRINT("info",("host is set: '%s'", mi->host));
1616
    String *packet= &thd->packet;
1617
    protocol->prepare_for_resend();
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1619
    /*
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      slave_running can be accessed without run_lock but not other
      non-volotile members like mi->io_thd, which is guarded by the mutex.
1622
    */
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    pthread_mutex_lock(&mi->run_lock);
    protocol->store(mi->io_thd ? mi->io_thd->proc_info : "", &my_charset_bin);
    pthread_mutex_unlock(&mi->run_lock);

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    pthread_mutex_lock(&mi->data_lock);
    pthread_mutex_lock(&mi->rli.data_lock);
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    pthread_mutex_lock(&mi->err_lock);
    pthread_mutex_lock(&mi->rli.err_lock);
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    protocol->store(mi->host, &my_charset_bin);
    protocol->store(mi->user, &my_charset_bin);
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    protocol->store((uint32) mi->port);
    protocol->store((uint32) mi->connect_retry);
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    protocol->store(mi->master_log_name, &my_charset_bin);
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    protocol->store((ulonglong) mi->master_log_pos);
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    protocol->store(mi->rli.group_relay_log_name +
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                    dirname_length(mi->rli.group_relay_log_name),
                    &my_charset_bin);
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    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 ?
                    "Yes" : "No", &my_charset_bin);
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    protocol->store(mi->rli.slave_running ? "Yes":"No", &my_charset_bin);
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    protocol->store(rpl_filter->get_do_db());
    protocol->store(rpl_filter->get_ignore_db());

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    char buf[256];
    String tmp(buf, sizeof(buf), &my_charset_bin);
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    rpl_filter->get_do_table(&tmp);
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    protocol->store(&tmp);
1652
    rpl_filter->get_ignore_table(&tmp);
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    protocol->store(&tmp);
1654
    rpl_filter->get_wild_do_table(&tmp);
1655
    protocol->store(&tmp);
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    rpl_filter->get_wild_ignore_table(&tmp);
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    protocol->store(&tmp);

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    protocol->store(mi->rli.last_error().number);
    protocol->store(mi->rli.last_error().message, &my_charset_bin);
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    protocol->store((uint32) mi->rli.slave_skip_counter);
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    protocol->store((ulonglong) mi->rli.group_master_log_pos);
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    protocol->store((ulonglong) mi->rli.log_space_total);
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    protocol->store(
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      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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          "Relay"), &my_charset_bin);
    protocol->store(mi->rli.until_log_name, &my_charset_bin);
    protocol->store((ulonglong) mi->rli.until_log_pos);
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#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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    /*
      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)
1689
    {
1690
      long time_diff= ((long)(time(0) - mi->rli.last_master_timestamp)
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                       - mi->clock_diff_with_master);
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      /*
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        Apparently on some systems time_diff can be <0. Here are possible
        reasons related to MySQL:
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        - 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.
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        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".
1711
      */
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      protocol->store((longlong)(mi->rli.last_master_timestamp ?
                                 max(0, time_diff) : 0));
1714
    }
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    else
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    {
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      protocol->store_null();
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    }
    protocol->store(mi->ssl_verify_server_cert? "Yes":"No", &my_charset_bin);
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1721
    // Last_IO_Errno
1722
    protocol->store(mi->last_error().number);
1723
    // Last_IO_Error
1724
    protocol->store(mi->last_error().message, &my_charset_bin);
1725
    // Last_SQL_Errno
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    protocol->store(mi->rli.last_error().number);
1727
    // Last_SQL_Error
1728
    protocol->store(mi->rli.last_error().message, &my_charset_bin);
1729

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    pthread_mutex_unlock(&mi->rli.err_lock);
    pthread_mutex_unlock(&mi->err_lock);
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    pthread_mutex_unlock(&mi->rli.data_lock);
    pthread_mutex_unlock(&mi->data_lock);
1734

1735
    if (my_net_write(&thd->net, (uchar*) thd->packet.ptr(), packet->length()))
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      DBUG_RETURN(TRUE);
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  }
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  my_eof(thd);
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  DBUG_RETURN(FALSE);
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}

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1743 1744
void set_slave_thread_options(THD* thd)
{
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  DBUG_ENTER("set_slave_thread_options");
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  /*
     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.
  */
  ulonglong options= thd->options | OPTION_BIG_SELECTS;
  if (opt_log_slave_updates)
    options|= OPTION_BIN_LOG;
  else
    options&= ~OPTION_BIN_LOG;
  thd->options= options;
1761
  thd->variables.completion_type= 0;
1762
  DBUG_VOID_RETURN;
1763
}
1764

1765
void set_slave_thread_default_charset(THD* thd, Relay_log_info const *rli)
1766
{
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  DBUG_ENTER("set_slave_thread_default_charset");

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  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();
1776 1777 1778 1779 1780 1781 1782

  /*
    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.
   */
1783
  const_cast<Relay_log_info*>(rli)->cached_charset_invalidate();
1784
  DBUG_VOID_RETURN;
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}

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/*
1788
  init_slave_thread()
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*/
1790

1791
static int init_slave_thread(THD* thd, SLAVE_THD_TYPE thd_type)
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{
  DBUG_ENTER("init_slave_thread");
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#if !defined(DBUG_OFF)
  int simulate_error= 0;
#endif
1797
  thd->system_thread = (thd_type == SLAVE_THD_SQL) ?
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    SYSTEM_THREAD_SLAVE_SQL : SYSTEM_THREAD_SLAVE_IO;
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  thd->security_ctx->skip_grants();
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  my_net_init(&thd->net, 0);
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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.
*/
1806
  thd->variables.max_allowed_packet= global_system_variables.max_allowed_packet
1807
    + MAX_LOG_EVENT_HEADER;  /* note, incr over the global not session var */
1808
  thd->slave_thread = 1;
1809
  thd->enable_slow_log= opt_log_slow_slave_statements;
1810
  set_slave_thread_options(thd);
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  thd->client_capabilities = CLIENT_LOCAL_FILES;
  pthread_mutex_lock(&LOCK_thread_count);
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  thd->thread_id= thd->variables.pseudo_thread_id= thread_id++;
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  pthread_mutex_unlock(&LOCK_thread_count);

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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););
#if !defined(DBUG_OFF)
  if (init_thr_lock() || thd->store_globals() || simulate_error & (1<< thd_type))
#else
1823
  if (init_thr_lock() || thd->store_globals())
1824
#endif
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  {
1826
    thd->cleanup();
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    DBUG_RETURN(-1);
  }
1829
  lex_start(thd);
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1831
  if (thd_type == SLAVE_THD_SQL)
1832
    thd_proc_info(thd, "Waiting for the next event in relay log");
1833
  else
1834
    thd_proc_info(thd, "Waiting for master update");
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  thd->version=refresh_version;
  thd->set_time();
  DBUG_RETURN(0);
}

1840

1841
static int safe_sleep(THD* thd, int sec, CHECK_KILLED_FUNC thread_killed,
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                      void* thread_killed_arg)
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{
1844
  int nap_time;
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  thr_alarm_t alarmed;
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  DBUG_ENTER("safe_sleep");

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  thr_alarm_init(&alarmed);
1849
  time_t start_time= my_time(0);
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  time_t end_time= start_time+sec;

1852
  while ((nap_time= (int) (end_time - start_time)) > 0)
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  {
1854
    ALARM alarm_buff;
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    /*
1856
      The only reason we are asking for alarm is so that
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      we will be woken up in case of murder, so if we do not get killed,
      set the alarm so it goes off after we wake up naturally
    */
1860
    thr_alarm(&alarmed, 2 * nap_time, &alarm_buff);
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    sleep(nap_time);
1862
    thr_end_alarm(&alarmed);
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1864
    if ((*thread_killed)(thd,thread_killed_arg))
1865
      DBUG_RETURN(1);
1866
    start_time= my_time(0);
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  }
1868
  DBUG_RETURN(0);
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}

1871

1872
static int request_dump(MYSQL* mysql, Master_info* mi,
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                        bool *suppress_warnings)
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{
1875
  uchar buf[FN_REFLEN + 10];
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  int len;
  int binlog_flags = 0; // for now
1878
  char* logname = mi->master_log_name;
1879
  DBUG_ENTER("request_dump");
1880 1881
  
  *suppress_warnings= FALSE;
1882

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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);
1886
  int4store(buf + 6, server_id);
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  len = (uint) strlen(logname);
1888
  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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    if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
1897
      *suppress_warnings= TRUE;                 // Suppress reconnect warning
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    else
1899
      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),
                      master_connect_retry);
1902
    DBUG_RETURN(1);
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  }
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1905
  DBUG_RETURN(0);
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}

1908

1909
static int request_table_dump(MYSQL* mysql, const char* db, const char* table)
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{
1911
  uchar buf[1024], *p = buf;
1912 1913
  DBUG_ENTER("request_table_dump");

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  uint table_len = (uint) strlen(table);
  uint db_len = (uint) strlen(db);
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  if (table_len + db_len > sizeof(buf) - 2)
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  {
    sql_print_error("request_table_dump: Buffer overrun");
1919
    DBUG_RETURN(1);
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  }

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  *p++ = db_len;
  memcpy(p, db, db_len);
  p += db_len;
  *p++ = table_len;
  memcpy(p, table, table_len);
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  if (simple_command(mysql, COM_TABLE_DUMP, buf, p - buf + table_len, 1))
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  {
    sql_print_error("request_table_dump: Error sending the table dump \
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command");
1932
    DBUG_RETURN(1);
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  }
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1935
  DBUG_RETURN(0);
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}

1938

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/*
1940
  Read one event from the master
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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.
1950

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

1956
static ulong read_event(MYSQL* mysql, Master_info *mi, bool* suppress_warnings)
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{
1958
  ulong len;
1959
  DBUG_ENTER("read_event");
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1961
  *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
1967
  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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1971
  len = cli_safe_read(mysql);
1972
  if (len == packet_error || (long) len < 1)
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  {
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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
1984
      sql_print_error("Error reading packet from server: %s ( server_errno=%d)",
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                      mysql_error(mysql), mysql_errno(mysql));
1986
    DBUG_RETURN(packet_error);
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  }

1989 1990
  /* Check if eof packet */
  if (len < 8 && mysql->net.read_pos[0] == 254)
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  {
1992 1993
    sql_print_information("Slave: received end packet from server, apparent "
                          "master shutdown: %s",
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                     mysql_error(mysql));
1995
     DBUG_RETURN(packet_error);
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  }
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  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)
{
2012 2013
  DBUG_ENTER("has_temporary_error");

2014
  DBUG_EXECUTE_IF("all_errors_are_temporary_errors",
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027
                  if (thd->main_da.is_error())
                  {
                    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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  /*
    Temporary error codes:
    currently, InnoDB deadlock detected by InnoDB or lock
    wait timeout (innodb_lock_wait_timeout exceeded
  */
2034 2035
  if (thd->main_da.sql_errno() == ER_LOCK_DEADLOCK ||
      thd->main_da.sql_errno() == ER_LOCK_WAIT_TIMEOUT)
2036
    DBUG_RETURN(1);
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#ifdef HAVE_NDB_BINLOG
  /*
    currently temporary error set in ndbcluster
  */
  List_iterator_fast<MYSQL_ERROR> it(thd->warn_list);
  MYSQL_ERROR *err;
  while ((err= it++))
  {
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    DBUG_PRINT("info", ("has warning %d %s", err->code, err->msg));
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    switch (err->code)
    {
    case ER_GET_TEMPORARY_ERRMSG:
2050
      DBUG_RETURN(1);
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    default:
      break;
    }
  }
#endif
2056
  DBUG_RETURN(0);
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}
2058

2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085

/**
  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().
*/
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int apply_event_and_update_pos(Log_event* ev, THD* thd, Relay_log_info* rli)
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{
  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",
                      FLAGSTR(thd->options, OPTION_NOT_AUTOCOMMIT),
                      FLAGSTR(thd->options, OPTION_BEGIN),
                      rli->last_event_start_time));

  /*
    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).
  */

  thd->server_id = ev->server_id; // use the original server id for logging
  thd->set_time();                            // time the query
  thd->lex->current_select= 0;
  if (!ev->when)
    ev->when= my_time(0);
  ev->thd = thd; // because up to this point, ev->thd == 0

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  int reason= ev->shall_skip(rli);
  if (reason == Log_event::EVENT_SKIP_COUNT)
    --rli->slave_skip_counter;
  pthread_mutex_unlock(&rli->data_lock);
  if (reason == Log_event::EVENT_SKIP_NOT)
    exec_res= ev->apply_event(rli);

2138
#ifndef DBUG_OFF
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  /*
    This only prints information to the debug trace.
2141

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    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",
                      thd->options & OPTION_BEGIN ? 1 : 0,
                      rli->get_flag(Relay_log_info::IN_STMT)));
  DBUG_PRINT("skip_event", ("%s event was %s",
                            ev->get_type_str(), explain[reason]));
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#endif

  DBUG_PRINT("info", ("apply_event error = %d", exec_res));
  if (exec_res == 0)
  {
    int error= ev->update_pos(rli);
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#ifdef HAVE_purify
    if (!rli->is_fake)
#endif
    {
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#ifndef DBUG_OFF
2168
      char buf[22];
2169
#endif
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      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)
    {
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      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
2223
     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.
*/
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static int exec_relay_log_event(THD* thd, Relay_log_info* rli)
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{
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  DBUG_ENTER("exec_relay_log_event");

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  /*
     We acquire this mutex since we need it for all operations except
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     event execution. But we will release it in places where we will
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     wait for something for example inside of next_event().
   */
  pthread_mutex_lock(&rli->data_lock);
2241

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  Log_event * ev = next_event(rli);
2243

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  DBUG_ASSERT(rli->sql_thd==thd);
2245

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  if (sql_slave_killed(thd,rli))
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  {
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    pthread_mutex_unlock(&rli->data_lock);
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    delete ev;
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    DBUG_RETURN(1);
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  }
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  if (ev)
  {
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    int exec_res;
2255

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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_NONE &&
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        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;
      pthread_mutex_unlock(&rli->data_lock);
      delete ev;
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      DBUG_RETURN(1);
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    }
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    exec_res= apply_event_and_update_pos(ev, thd, rli);
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    /*
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      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.
2281
    */
2282
    if (ev->get_type_code() != FORMAT_DESCRIPTION_EVENT)
2283
    {
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      DBUG_PRINT("info", ("Deleting the event after it has been executed"));
      delete ev;
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    }

2288
    /*
2289 2290
      update_log_pos failed: this should not happen, so we don't
      retry.
2291
    */
2292 2293 2294
    if (exec_res == 2)
      DBUG_RETURN(1);

2295 2296
    if (slave_trans_retries)
    {
2297 2298
      int temp_err;
      if (exec_res && (temp_err= has_temporary_error(thd)))
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      {
        const char *errmsg;
        /*
          We were in a transaction which has been rolled back because of a
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          temporary error;
          let's seek back to BEGIN log event and retry it all again.
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	  Note, if lock wait timeout (innodb_lock_wait_timeout exceeded)
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	  there is no rollback since 5.0.13 (ref: manual).
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          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.
        */
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        if (rli->trans_retries < slave_trans_retries)
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        {
          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,
2322
                                      1, &errmsg, 1))
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            sql_print_error("Error initializing relay log position: %s",
                            errmsg);
          else
          {
            exec_res= 0;
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            end_trans(thd, ROLLBACK);
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            /* chance for concurrent connection to get more locks */
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            safe_sleep(thd, min(rli->trans_retries, MAX_SLAVE_RETRY_PAUSE),
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                       (CHECK_KILLED_FUNC)sql_slave_killed, (void*)rli);
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            pthread_mutex_lock(&rli->data_lock); // because of SHOW STATUS
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            rli->trans_retries++;
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            rli->retried_trans++;
            pthread_mutex_unlock(&rli->data_lock);
            DBUG_PRINT("info", ("Slave retries transaction "
                                "rli->trans_retries: %lu", rli->trans_retries));
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          }
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        }
        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);
      }
2346
      else if ((exec_res && !temp_err) ||
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               (opt_using_transactions &&
                rli->group_relay_log_pos == rli->event_relay_log_pos))
2349 2350
      {
        /*
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          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
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          non-transient error, the slave will stop with an error.
         */
        rli->trans_retries= 0; // restart from fresh
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        DBUG_PRINT("info", ("Resetting retry counter, rli->trans_retries: %lu",
2358
                            rli->trans_retries));
2359
      }
2360 2361
    }
    DBUG_RETURN(exec_res);
2362
  }
2363
  pthread_mutex_unlock(&rli->data_lock);
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  rli->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_READ_FAILURE,
              ER(ER_SLAVE_RELAY_LOG_READ_FAILURE), "\
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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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");
2374
  DBUG_RETURN(1);
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}

2377

2378
static bool check_io_slave_killed(THD *thd, Master_info *mi, const char *info)
2379 2380 2381
{
  if (io_slave_killed(thd, mi))
  {
2382
    if (info && global_system_variables.log_warnings)
2383
      sql_print_information("%s", info);
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    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.
*/

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static int try_to_reconnect(THD *thd, MYSQL *mysql, Master_info *mi,
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                            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
    safe_sleep(thd, mi->connect_retry, (CHECK_KILLED_FUNC) io_slave_killed,
               (void *) mi);
  }
  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
    {
2453
      sql_print_information("%s", buf);
2454 2455 2456 2457 2458
    }
  }
  if (safe_reconnect(thd, mysql, mi, 1) || io_slave_killed(thd, mi))
  {
    if (global_system_variables.log_warnings)
2459
      sql_print_information("%s", messages[SLAVE_RECON_MSG_KILLED_AFTER]);
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    return 1;
  }
  return 0;
}


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/**
  Slave IO thread entry point.

  @param arg Pointer to Master_info struct that holds information for
  the IO thread.
2471

2472 2473
  @return Always 0.
*/
2474
pthread_handler_t handle_slave_io(void *arg)
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{
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  THD *thd; // needs to be first for thread_stack
  MYSQL *mysql;
2478
  Master_info *mi = (Master_info*)arg;
2479
  Relay_log_info *rli= &mi->rli;
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  char llbuff[22];
  uint retry_count;
2482
  bool suppress_warnings;
2483
  int ret;
2484 2485 2486
#ifndef DBUG_OFF
  uint retry_count_reg= 0, retry_count_dump= 0, retry_count_event= 0;
#endif
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  // needs to call my_thread_init(), otherwise we get a coredump in DBUG_ stuff
  my_thread_init();
2489
  DBUG_ENTER("handle_slave_io");
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2491
  DBUG_ASSERT(mi->inited);
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  mysql= NULL ;
  retry_count= 0;

2495
  pthread_mutex_lock(&mi->run_lock);
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  /* Inform waiting threads that slave has started */
  mi->slave_run_id++;

2499
#ifndef DBUG_OFF
2500
  mi->events_till_disconnect = disconnect_slave_event_count;
2501 2502
#endif

2503
  thd= new THD; // note that contructor of THD uses DBUG_ !
2504
  THD_CHECK_SENTRY(thd);
2505
  mi->io_thd = thd;
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  pthread_detach_this_thread();
2508
  thd->thread_stack= (char*) &thd; // remember where our stack is
2509
  mi->clear_error();
2510
  if (init_slave_thread(thd, SLAVE_THD_IO))
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  {
    pthread_cond_broadcast(&mi->start_cond);
    pthread_mutex_unlock(&mi->run_lock);
    sql_print_error("Failed during slave I/O thread initialization");
    goto err;
  }
2517
  pthread_mutex_lock(&LOCK_thread_count);
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  threads.append(thd);
2519
  pthread_mutex_unlock(&LOCK_thread_count);
2520 2521 2522
  mi->slave_running = 1;
  mi->abort_slave = 0;
  pthread_mutex_unlock(&mi->run_lock);
2523
  pthread_cond_broadcast(&mi->start_cond);
2524

2525
  DBUG_PRINT("master_info",("log_file_name: '%s'  position: %s",
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                            mi->master_log_name,
                            llstr(mi->master_log_pos,llbuff)));
2528

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  if (!(mi->mysql = mysql = mysql_init(NULL)))
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  {
2531 2532
    mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
               ER(ER_SLAVE_FATAL_ERROR), "error in mysql_init()");
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    goto err;
  }
2535

2536
  thd_proc_info(thd, "Connecting to master");
2537
  // we can get killed during safe_connect
2538
  if (!safe_connect(thd, mysql, mi))
2539
  {
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    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,
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			  IO_RPL_LOG_NAME,
			  llstr(mi->master_log_pos,llbuff));
2545 2546 2547 2548 2549
  /*
    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.
  */
2550 2551
    mysql->net.max_packet_size= thd->net.max_packet_size+= MAX_LOG_EVENT_HEADER;
  }
2552
  else
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  {
2554
    sql_print_information("Slave I/O thread killed while connecting to master");
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    goto err;
  }
2557

2558
connected:
2559

2560
  DBUG_SYNC_POINT("debug_lock.before_get_running_status_yes", 10);
2561 2562
  // TODO: the assignment below should be under mutex (5.0)
  mi->slave_running= MYSQL_SLAVE_RUN_CONNECT;
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  thd->slave_net = &mysql->net;
2564
  thd_proc_info(thd, "Checking master version");
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  ret= get_master_version_and_clock(mysql, mi);
  if (ret == 1)
    /* Fatal error */
2568
    goto err;
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  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;
  } 
2582 2583

  if (mi->rli.relay_log.description_event_for_queue->binlog_version > 1)
2584
  {
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    /*
      Register ourselves with the master.
    */
2588
    thd_proc_info(thd, "Registering slave on master");
2589
    if (register_slave_on_master(mysql, mi, &suppress_warnings))
2590
    {
2591 2592 2593 2594 2595 2596 2597 2598 2599
      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
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        goto err;
      goto connected;
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    }
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    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;
      });
2613
  }
2614

2615
  DBUG_PRINT("info",("Starting reading binary log from master"));
2616
  while (!io_slave_killed(thd,mi))
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  {
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    thd_proc_info(thd, "Requesting binlog dump");
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    if (request_dump(mysql, mi, &suppress_warnings))
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    {
      sql_print_error("Failed on request_dump()");
2622 2623 2624 2625
      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]))
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        goto err;
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2627 2628
      goto connected;
    }
2629 2630 2631 2632 2633 2634 2635 2636 2637 2638
    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;
      });
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2639

2640
    DBUG_ASSERT(mi->last_error().number == 0);
2641
    while (!io_slave_killed(thd,mi))
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2642
    {
2643
      ulong event_len;
2644
      /*
2645
         We say "waiting" because read_event() will wait if there's nothing to
2646 2647 2648
         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.
2649
      */
2650
      thd_proc_info(thd, "Waiting for master to send event");
2651
      event_len= read_event(mysql, mi, &suppress_warnings);
2652 2653
      if (check_io_slave_killed(thd, mi, "Slave I/O thread killed while \
reading event"))
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2654
        goto err;
2655 2656 2657 2658 2659 2660 2661 2662 2663 2664
      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;
        });
2665

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2666 2667
      if (event_len == packet_error)
      {
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2668
        uint mysql_error_number= mysql_errno(mysql);
2669 2670
        switch (mysql_error_number) {
        case CR_NET_PACKET_TOO_LARGE:
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2671
          sql_print_error("\
2672 2673 2674
Log entry on master is longer than max_allowed_packet (%ld) on \
slave. If the entry is correct, restart the server with a higher value of \
max_allowed_packet",
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                          thd->variables.max_allowed_packet);
2676
          mi->report(ERROR_LEVEL, ER_NET_PACKET_TOO_LARGE,
2677
                     "%s", ER(ER_NET_PACKET_TOO_LARGE));
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2678
          goto err;
2679
        case ER_MASTER_FATAL_ERROR_READING_BINLOG:
2680 2681 2682
          mi->report(ERROR_LEVEL, ER_MASTER_FATAL_ERROR_READING_BINLOG,
                     ER(ER_MASTER_FATAL_ERROR_READING_BINLOG),
                     mysql_error_number, mysql_error(mysql));
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          goto err;
2684
        case ER_OUT_OF_RESOURCES:
2685 2686
          sql_print_error("\
Stopping slave I/O thread due to out-of-memory error from master");
2687
          mi->report(ERROR_LEVEL, ER_OUT_OF_RESOURCES,
2688
                     "%s", ER(ER_OUT_OF_RESOURCES));
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2689 2690
          goto err;
        }
2691 2692
        if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                             reconnect_messages[SLAVE_RECON_ACT_EVENT]))
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2693 2694
          goto err;
        goto connected;
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2695
      } // if (event_len == packet_error)
2696

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2697
      retry_count=0;                    // ok event, reset retry counter
2698
      thd_proc_info(thd, "Queueing master event to the relay log");
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2699
      if (queue_event(mi,(const char*)mysql->net.read_pos + 1,
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                      event_len))
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      {
2702 2703 2704
        mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE,
                   ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
                   "could not queue event from master");
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        goto err;
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2706
      }
2707 2708 2709 2710 2711
      if (flush_master_info(mi, 1))
      {
        sql_print_error("Failed to flush master info file");
        goto err;
      }
2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723
      /*
        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.
      */
2724 2725 2726 2727 2728
#ifndef DBUG_OFF
      {
        char llbuf1[22], llbuf2[22];
        DBUG_PRINT("info", ("log_space_limit=%s log_space_total=%s \
ignore_log_space_limit=%d",
2729 2730
                            llstr(rli->log_space_limit,llbuf1),
                            llstr(rli->log_space_total,llbuf2),
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                            (int) rli->ignore_log_space_limit));
2732 2733 2734
      }
#endif

2735
      if (rli->log_space_limit && rli->log_space_limit <
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          rli->log_space_total &&
2737
          !rli->ignore_log_space_limit)
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2738 2739 2740
        if (wait_for_relay_log_space(rli))
        {
          sql_print_error("Slave I/O thread aborted while waiting for relay \
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2741
log space");
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2742 2743 2744
          goto err;
        }
    }
2745
  }
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2746

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2747
  // error = 0;
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err:
2749
  // print the current replication position
2750
  sql_print_information("Slave I/O thread exiting, read up to log '%s', position %s",
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                  IO_RPL_LOG_NAME, llstr(mi->master_log_pos,llbuff));
2752
  thd->set_query(NULL, 0);
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2753
  thd->reset_db(NULL, 0);
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2754 2755
  if (mysql)
  {
2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766
    /*
      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
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    mysql_close(mysql);
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2768 2769
    mi->mysql=0;
  }
2770
  write_ignored_events_info_to_relay_log(thd, mi);
2771
  thd_proc_info(thd, "Waiting for slave mutex on exit");
2772
  pthread_mutex_lock(&mi->run_lock);
2773

2774 2775 2776
  /* Forget the relay log's format */
  delete mi->rli.relay_log.description_event_for_queue;
  mi->rli.relay_log.description_event_for_queue= 0;
2777
  // TODO: make rpl_status part of Master_info
2778
  change_rpl_status(RPL_ACTIVE_SLAVE,RPL_IDLE_SLAVE);
2779
  DBUG_ASSERT(thd->net.buff != 0);
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2780
  net_end(&thd->net); // destructor will not free it, because net.vio is 0
2781
  close_thread_tables(thd);
2782
  pthread_mutex_lock(&LOCK_thread_count);
2783
  THD_CHECK_SENTRY(thd);
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2784
  delete thd;
2785
  pthread_mutex_unlock(&LOCK_thread_count);
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2786 2787 2788
  mi->abort_slave= 0;
  mi->slave_running= 0;
  mi->io_thd= 0;
2789 2790 2791 2792 2793
  /*
    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)
   */ 
2794
  pthread_cond_broadcast(&mi->stop_cond);       // tell the world we are done
2795
  DBUG_EXECUTE_IF("simulate_slave_delay_at_terminate_bug38694", sleep(5););
2796
  pthread_mutex_unlock(&mi->run_lock);
2797 2798

  DBUG_LEAVE;                                   // Must match DBUG_ENTER()
2799
  my_thread_end();
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2800
  pthread_exit(0);
2801
  return 0;                                     // Avoid compiler warnings
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2802 2803
}

2804 2805 2806 2807 2808
/*
  Check the temporary directory used by commands like
  LOAD DATA INFILE.
 */
static 
2809
int check_temp_dir(char* tmp_file)
2810 2811 2812
{
  int fd;
  MY_DIR *dirp;
2813 2814
  char tmp_dir[FN_REFLEN];
  size_t tmp_dir_size;
2815 2816 2817

  DBUG_ENTER("check_temp_dir");

2818 2819 2820 2821 2822
  /*
    Get the directory from the temporary file.
  */
  dirname_part(tmp_dir, tmp_file, &tmp_dir_size);

2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845
  /*
    Check if the directory exists.
   */
  if (!(dirp=my_dir(tmp_dir,MYF(MY_WME))))
    DBUG_RETURN(1);
  my_dirend(dirp);

  /*
    Check permissions to create a file.
   */
  if ((fd= my_create(tmp_file, CREATE_MODE,
                     O_WRONLY | O_BINARY | O_EXCL | O_NOFOLLOW,
                     MYF(MY_WME))) < 0)
  DBUG_RETURN(1);

  /*
    Clean up.
   */
  my_close(fd, MYF(0));
  my_delete(tmp_file, MYF(0));

  DBUG_RETURN(0);
}
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2846

2847 2848 2849 2850 2851
/**
  Slave SQL thread entry point.

  @param arg Pointer to Relay_log_info object that holds information
  for the SQL thread.
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2852

2853 2854
  @return Always 0.
*/
2855
pthread_handler_t handle_slave_sql(void *arg)
2856
{
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2857
  THD *thd;                     /* needs to be first for thread_stack */
2858
  char llbuff[22],llbuff1[22];
2859

2860
  Relay_log_info* rli = &((Master_info*)arg)->rli;
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2861 2862 2863 2864
  const char *errmsg;

  // needs to call my_thread_init(), otherwise we get a coredump in DBUG_ stuff
  my_thread_init();
2865
  DBUG_ENTER("handle_slave_sql");
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2866

2867 2868 2869
  DBUG_ASSERT(rli->inited);
  pthread_mutex_lock(&rli->run_lock);
  DBUG_ASSERT(!rli->slave_running);
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2870
  errmsg= 0;
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2871
#ifndef DBUG_OFF
2872
  rli->events_till_abort = abort_slave_event_count;
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2873
#endif
2874

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2875
  thd = new THD; // note that contructor of THD uses DBUG_ !
2876
  thd->thread_stack = (char*)&thd; // remember where our stack is
2877
  rli->sql_thd= thd;
2878
  
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2879 2880
  /* Inform waiting threads that slave has started */
  rli->slave_run_id++;
2881
  rli->slave_running = 1;
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2882

2883 2884
  pthread_detach_this_thread();
  if (init_slave_thread(thd, SLAVE_THD_SQL))
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2885 2886 2887 2888 2889 2890 2891
  {
    /*
      TODO: this is currently broken - slave start and change master
      will be stuck if we fail here
    */
    pthread_cond_broadcast(&rli->start_cond);
    pthread_mutex_unlock(&rli->run_lock);
2892 2893
    rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, 
                "Failed during slave thread initialization");
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2894 2895
    goto err;
  }
2896
  thd->init_for_queries();
2897
  thd->temporary_tables = rli->save_temporary_tables; // restore temp tables
2898
  set_thd_in_use_temporary_tables(rli);   // (re)set sql_thd in use for saved temp tables
2899
  pthread_mutex_lock(&LOCK_thread_count);
2900
  threads.append(thd);
2901
  pthread_mutex_unlock(&LOCK_thread_count);
2902 2903 2904 2905 2906 2907 2908 2909
  /*
    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.
  */
2910 2911
  rli->abort_slave = 0;
  pthread_mutex_unlock(&rli->run_lock);
2912
  pthread_cond_broadcast(&rli->start_cond);
2913

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2914 2915 2916
  /*
    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
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2917
    though there's no problem anymore). Do not reset the master timestamp
2918 2919 2920 2921
    (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.
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2922
    But the master timestamp is reset by RESET SLAVE & CHANGE MASTER.
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2923
  */
2924
  rli->clear_error();
2925 2926

  //tell the I/O thread to take relay_log_space_limit into account from now on
2927
  pthread_mutex_lock(&rli->log_space_lock);
2928
  rli->ignore_log_space_limit= 0;
2929
  pthread_mutex_unlock(&rli->log_space_lock);
2930
  rli->trans_retries= 0; // start from "no error"
unknown's avatar
unknown committed
2931
  DBUG_PRINT("info", ("rli->trans_retries: %lu", rli->trans_retries));
2932

2933
  if (init_relay_log_pos(rli,
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2934 2935 2936
                         rli->group_relay_log_name,
                         rli->group_relay_log_pos,
                         1 /*need data lock*/, &errmsg,
2937
                         1 /*look for a description_event*/))
2938 2939 2940
  { 
    rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, 
                "Error initializing relay log position: %s", errmsg);
2941 2942
    goto err;
  }
2943
  THD_CHECK_SENTRY(thd);
2944 2945 2946 2947
#ifndef DBUG_OFF
  {
    char llbuf1[22], llbuf2[22];
    DBUG_PRINT("info", ("my_b_tell(rli->cur_log)=%s rli->event_relay_log_pos=%s",
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2948
                        llstr(my_b_tell(rli->cur_log),llbuf1),
2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967
                        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
2968
  DBUG_ASSERT(rli->sql_thd == thd);
2969 2970

  DBUG_PRINT("master_info",("log_file_name: %s  position: %s",
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unknown committed
2971 2972
                            rli->group_master_log_name,
                            llstr(rli->group_master_log_pos,llbuff)));
2973
  if (global_system_variables.log_warnings)
2974
    sql_print_information("Slave SQL thread initialized, starting replication in \
unknown's avatar
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2975
log '%s' at position %s, relay log '%s' position: %s", RPL_LOG_NAME,
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2976 2977
                    llstr(rli->group_master_log_pos,llbuff),rli->group_relay_log_name,
                    llstr(rli->group_relay_log_pos,llbuff1));
2978

2979
  if (check_temp_dir(rli->slave_patternload_file))
2980 2981 2982 2983 2984 2985 2986
  {
    rli->report(ERROR_LEVEL, thd->main_da.sql_errno(), 
                "Unable to use slave's temporary directory %s - %s", 
                slave_load_tmpdir, thd->main_da.message());
    goto err;
  }

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2987
  /* execute init_slave variable */
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2988
  if (sys_init_slave.value_length)
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2989
  {
2990
    execute_init_command(thd, &sys_init_slave, &LOCK_sys_init_slave);
2991
    if (thd->is_slave_error)
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2992
    {
2993 2994
      rli->report(ERROR_LEVEL, thd->main_da.sql_errno(), 
                  "Slave SQL thread aborted. Can't execute init_slave query");
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2995 2996 2997 2998
      goto err;
    }
  }

2999 3000 3001 3002 3003
  /*
    First check until condition - probably there is nothing to execute. We
    do not want to wait for next event in this case.
  */
  pthread_mutex_lock(&rli->data_lock);
3004
  if (rli->until_condition != Relay_log_info::UNTIL_NONE &&
3005
      rli->is_until_satisfied(thd, NULL))
3006 3007 3008 3009 3010 3011 3012 3013 3014
  {
    char buf[22];
    sql_print_information("Slave SQL thread stopped because it reached its"
                          " UNTIL position %s", llstr(rli->until_pos(), buf));
    pthread_mutex_unlock(&rli->data_lock);
    goto err;
  }
  pthread_mutex_unlock(&rli->data_lock);

3015 3016
  /* Read queries from the IO/THREAD until this thread is killed */

3017
  while (!sql_slave_killed(thd,rli))
3018
  {
3019
    thd_proc_info(thd, "Reading event from the relay log");
3020
    DBUG_ASSERT(rli->sql_thd == thd);
3021
    THD_CHECK_SENTRY(thd);
3022 3023
    if (exec_relay_log_event(thd,rli))
    {
3024
      DBUG_PRINT("info", ("exec_relay_log_event() failed"));
3025
      // do not scare the user if SQL thread was simply killed or stopped
3026
      if (!sql_slave_killed(thd,rli))
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3027 3028
      {
        /*
3029 3030 3031
          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
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3032
        */
3033
        uint32 const last_errno= rli->last_error().number;
3034

3035
        if (thd->is_error())
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3036
        {
3037 3038 3039 3040 3041
          char const *const errmsg= thd->main_da.message();

          DBUG_PRINT("info",
                     ("thd->main_da.sql_errno()=%d; rli->last_error.number=%d",
                      thd->main_da.sql_errno(), last_errno));
3042
          if (last_errno == 0)
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3043
          {
3044 3045 3046 3047
            /*
 	      This function is reporting an error which was not reported
 	      while executing exec_relay_log_event().
 	    */ 
3048
            rli->report(ERROR_LEVEL, thd->main_da.sql_errno(), "%s", errmsg);
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3049
          }
3050
          else if (last_errno != thd->main_da.sql_errno())
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3051
          {
3052 3053 3054 3055 3056 3057
            /*
             * 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.
             */  
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unknown committed
3058
            sql_print_error("Slave (additional info): %s Error_code: %d",
3059
                            errmsg, thd->main_da.sql_errno());
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3060 3061 3062 3063 3064 3065
          }
        }

        /* Print any warnings issued */
        List_iterator_fast<MYSQL_ERROR> it(thd->warn_list);
        MYSQL_ERROR *err;
3066 3067 3068 3069 3070
        /*
          Added controlled slave thread cancel for replication
          of user-defined variables.
        */
        bool udf_error = false;
unknown's avatar
unknown committed
3071
        while ((err= it++))
3072 3073 3074
        {
          if (err->code == ER_CANT_OPEN_LIBRARY)
            udf_error = true;
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3075
          sql_print_warning("Slave: %s Error_code: %d",err->msg, err->code);
3076 3077 3078 3079 3080 3081 3082 3083 3084
        }
        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("\
3085
Error running query, slave SQL thread aborted. Fix the problem, and restart \
unknown's avatar
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3086
the slave SQL thread with \"SLAVE START\". We stopped at log \
3087
'%s' position %s", RPL_LOG_NAME, llstr(rli->group_master_log_pos, llbuff));
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3088
      }
3089 3090
      goto err;
    }
3091
  }
3092

3093
  /* Thread stopped. Print the current replication position to the log */
unknown's avatar
unknown committed
3094
  sql_print_information("Slave SQL thread exiting, replication stopped in log "
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3095 3096
                        "'%s' at position %s",
                        RPL_LOG_NAME, llstr(rli->group_master_log_pos,llbuff));
3097 3098

 err:
3099 3100 3101 3102 3103 3104 3105 3106

  /*
    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:
  */
  rli->cleanup_context(thd, 1);
3107 3108 3109 3110 3111
  /*
    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)).
  */
3112 3113
  thd->catalog= 0;
  thd->set_query(NULL, 0);
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3114
  thd->reset_db(NULL, 0);
3115
  thd_proc_info(thd, "Waiting for slave mutex on exit");
3116
  pthread_mutex_lock(&rli->run_lock);
3117 3118
  /* We need data_lock, at least to wake up any waiting master_pos_wait() */
  pthread_mutex_lock(&rli->data_lock);
3119
  DBUG_ASSERT(rli->slave_running == 1); // tracking buffer overrun
3120
  /* When master_pos_wait() wakes up it will check this and terminate */
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  rli->slave_running= 0;
3122 3123 3124
  /* Forget the relay log's format */
  delete rli->relay_log.description_event_for_exec;
  rli->relay_log.description_event_for_exec= 0;
3125 3126 3127 3128
  /* Wake up master_pos_wait() */
  pthread_mutex_unlock(&rli->data_lock);
  DBUG_PRINT("info",("Signaling possibly waiting master_pos_wait() functions"));
  pthread_cond_broadcast(&rli->data_cond);
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  rli->ignore_log_space_limit= 0; /* don't need any lock */
3130 3131
  /* we die so won't remember charset - re-update them on next thread start */
  rli->cached_charset_invalidate();
3132
  rli->save_temporary_tables = thd->temporary_tables;
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3133 3134 3135 3136 3137

  /*
    TODO: see if we can do this conditionally in next_event() instead
    to avoid unneeded position re-init
  */
3138 3139 3140 3141
  thd->temporary_tables = 0; // remove tempation from destructor to close them
  DBUG_ASSERT(thd->net.buff != 0);
  net_end(&thd->net); // destructor will not free it, because we are weird
  DBUG_ASSERT(rli->sql_thd == thd);
3142
  THD_CHECK_SENTRY(thd);
3143
  rli->sql_thd= 0;
3144
  set_thd_in_use_temporary_tables(rli);  // (re)set sql_thd in use for saved temp tables
3145
  pthread_mutex_lock(&LOCK_thread_count);
3146
  THD_CHECK_SENTRY(thd);
3147 3148
  delete thd;
  pthread_mutex_unlock(&LOCK_thread_count);
3149 3150 3151 3152 3153
 /*
  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)
 */ 
3154
  pthread_cond_broadcast(&rli->stop_cond);
3155
  DBUG_EXECUTE_IF("simulate_slave_delay_at_terminate_bug38694", sleep(5););
3156
  pthread_mutex_unlock(&rli->run_lock);  // tell the world we are done
3157 3158

  DBUG_LEAVE;                                   // Must match DBUG_ENTER()
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  my_thread_end();
3160
  pthread_exit(0);
3161
  return 0;                                     // Avoid compiler warnings
3162
}
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3163

3164

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3165
/*
3166
  process_io_create_file()
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*/
3168

3169
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;
3174 3175
  THD *thd = mi->io_thd;
  NET *net = &mi->mysql->net;
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  DBUG_ENTER("process_io_create_file");
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3177 3178

  if (unlikely(!cev->is_valid()))
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    DBUG_RETURN(1);
3180 3181

  if (!rpl_filter->db_ok(cev->db))
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  {
    skip_load_data_infile(net);
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    DBUG_RETURN(0);
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  }
  DBUG_ASSERT(cev->inited_from_old);
  thd->file_id = cev->file_id = mi->file_id++;
3188
  thd->server_id = cev->server_id;
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  cev_not_written = 1;
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3190

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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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                    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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  */
  {
3204
    Append_block_log_event aev(thd,0,0,0,0);
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3205

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    for (;;)
    {
      if (unlikely((num_bytes=my_net_read(net)) == packet_error))
      {
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        sql_print_error("Network read error downloading '%s' from master",
                        cev->fname);
        goto err;
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      }
      if (unlikely(!num_bytes)) /* eof */
      {
3216 3217
	/* 3.23 master wants it */
        net_write_command(net, 0, (uchar*) "", 0, (uchar*) "", 0);
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3218 3219 3220 3221 3222 3223 3224
        /*
          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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          break;
        Execute_load_log_event xev(thd,0,0);
        xev.log_pos = cev->log_pos;
        if (unlikely(mi->rli.relay_log.append(&xev)))
        {
3230 3231 3232
          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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          goto err;
        }
        mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total);
        break;
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      }
      if (unlikely(cev_not_written))
      {
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        cev->block = net->read_pos;
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        cev->block_len = num_bytes;
        if (unlikely(mi->rli.relay_log.append(cev)))
        {
3244 3245 3246
          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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          goto err;
        }
        cev_not_written=0;
        mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total);
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      }
      else
      {
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        aev.block = net->read_pos;
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        aev.block_len = num_bytes;
        aev.log_pos = cev->log_pos;
        if (unlikely(mi->rli.relay_log.append(&aev)))
        {
3259 3260 3261
          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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          goto err;
        }
        mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total) ;
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3265 3266 3267 3268 3269
      }
    }
  }
  error=0;
err:
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3270
  DBUG_RETURN(error);
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3271
}
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3272

3273

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3274
/*
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3275 3276 3277 3278
  Start using a new binary log on the master

  SYNOPSIS
    process_io_rotate()
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3279 3280
    mi                  master_info for the slave
    rev                 The rotate log event read from the binary log
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3281 3282

  DESCRIPTION
3283
    Updates the master info with the place in the next binary
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3284
    log where we should start reading.
3285
    Rotate the relay log to avoid mixed-format relay logs.
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3286 3287 3288 3289 3290

  NOTES
    We assume we already locked mi->data_lock

  RETURN VALUES
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3291 3292
    0           ok
    1           Log event is illegal
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3293 3294 3295

*/

3296
static int process_io_rotate(Master_info *mi, Rotate_log_event *rev)
3297
{
3298
  DBUG_ENTER("process_io_rotate");
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  safe_mutex_assert_owner(&mi->data_lock);
3300

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3301
  if (unlikely(!rev->is_valid()))
3302
    DBUG_RETURN(1);
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3303

3304
  /* Safe copy as 'rev' has been "sanitized" in Rotate_log_event's ctor */
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3305 3306
  memcpy(mi->master_log_name, rev->new_log_ident, rev->ident_len+1);
  mi->master_log_pos= rev->pos;
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3307
  DBUG_PRINT("info", ("master_log_pos: '%s' %lu",
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3308
                      mi->master_log_name, (ulong) mi->master_log_pos));
3309
#ifndef DBUG_OFF
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3310 3311 3312 3313 3314
  /*
    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)
3315
    mi->events_till_disconnect++;
3316
#endif
3317

3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331
  /*
    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)
  {
    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);
  }
3332 3333 3334 3335
  /*
    Rotate the relay log makes binlog format detection easier (at next slave
    start or mysqlbinlog)
  */
3336
  rotate_relay_log(mi); /* will take the right mutexes */
3337
  DBUG_RETURN(0);
3338 3339
}

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3340
/*
3341 3342
  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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3343
*/
3344
static int queue_binlog_ver_1_event(Master_info *mi, const char *buf,
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3345
                           ulong event_len)
3346
{
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  const char *errmsg = 0;
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3348 3349 3350
  ulong inc_pos;
  bool ignore_event= 0;
  char *tmp_buf = 0;
3351
  Relay_log_info *rli= &mi->rli;
3352
  DBUG_ENTER("queue_binlog_ver_1_event");
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3353

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3354 3355 3356
  /*
    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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3357 3358 3359 3360 3361
  */
  if (buf[EVENT_TYPE_OFFSET] == LOAD_EVENT)
  {
    if (unlikely(!(tmp_buf=(char*)my_malloc(event_len+1,MYF(MY_WME)))))
    {
3362 3363
      mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
                 ER(ER_SLAVE_FATAL_ERROR), "Memory allocation failed");
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      DBUG_RETURN(1);
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    }
    memcpy(tmp_buf,buf,event_len);
3367 3368 3369 3370 3371 3372 3373 3374
    /*
      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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    int4store(tmp_buf+EVENT_LEN_OFFSET, event_len);
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3376 3377
    buf = (const char*)tmp_buf;
  }
3378 3379 3380 3381 3382 3383
  /*
    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).
  */
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3384
  Log_event *ev = Log_event::read_log_event(buf,event_len, &errmsg,
3385
                                            mi->rli.relay_log.description_event_for_queue);
3386
  if (unlikely(!ev))
3387 3388
  {
    sql_print_error("Read invalid event from master: '%s',\
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3389
 master could be corrupt but a more likely cause of this is a bug",
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3390
                    errmsg);
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3391 3392
    my_free((char*) tmp_buf, MYF(MY_ALLOW_ZERO_PTR));
    DBUG_RETURN(1);
3393
  }
3394

3395
  pthread_mutex_lock(&mi->data_lock);
3396
  ev->log_pos= mi->master_log_pos; /* 3.23 events don't contain log_pos */
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3397
  switch (ev->get_type_code()) {
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3398
  case STOP_EVENT:
3399
    ignore_event= 1;
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3400 3401
    inc_pos= event_len;
    break;
3402
  case ROTATE_EVENT:
3403
    if (unlikely(process_io_rotate(mi,(Rotate_log_event*)ev)))
3404 3405
    {
      delete ev;
3406
      pthread_mutex_unlock(&mi->data_lock);
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3407
      DBUG_RETURN(1);
3408
    }
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3409
    inc_pos= 0;
3410
    break;
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3411
  case CREATE_FILE_EVENT:
3412 3413 3414 3415 3416 3417
    /*
      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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  {
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3419
    /* We come here when and only when tmp_buf != 0 */
3420
    DBUG_ASSERT(tmp_buf != 0);
3421 3422
    inc_pos=event_len;
    ev->log_pos+= inc_pos;
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3423
    int error = process_io_create_file(mi,(Create_file_log_event*)ev);
3424
    delete ev;
3425
    mi->master_log_pos += inc_pos;
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3426
    DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
3427
    pthread_mutex_unlock(&mi->data_lock);
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    my_free((char*)tmp_buf, MYF(0));
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3429
    DBUG_RETURN(error);
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3430
  }
3431
  default:
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3432
    inc_pos= event_len;
3433 3434
    break;
  }
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3435
  if (likely(!ignore_event))
3436
  {
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3437 3438
    if (ev->log_pos)
      /*
3439 3440 3441 3442
         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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    if (unlikely(rli->relay_log.append(ev)))
3444 3445 3446
    {
      delete ev;
      pthread_mutex_unlock(&mi->data_lock);
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3447
      DBUG_RETURN(1);
3448
    }
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3449
    rli->relay_log.harvest_bytes_written(&rli->log_space_total);
3450 3451
  }
  delete ev;
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3452
  mi->master_log_pos+= inc_pos;
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3453
  DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
3454
  pthread_mutex_unlock(&mi->data_lock);
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3455
  DBUG_RETURN(0);
3456 3457
}

3458 3459 3460 3461
/*
  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.
*/
3462
static int queue_binlog_ver_3_event(Master_info *mi, const char *buf,
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3463
                           ulong event_len)
3464 3465 3466 3467
{
  const char *errmsg = 0;
  ulong inc_pos;
  char *tmp_buf = 0;
3468
  Relay_log_info *rli= &mi->rli;
3469 3470 3471 3472 3473 3474 3475 3476 3477
  DBUG_ENTER("queue_binlog_ver_3_event");

  /* read_log_event() will adjust log_pos to be end_log_pos */
  Log_event *ev = Log_event::read_log_event(buf,event_len, &errmsg,
                                            mi->rli.relay_log.description_event_for_queue);
  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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3478
                    errmsg);
3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508
    my_free((char*) tmp_buf, MYF(MY_ALLOW_ZERO_PTR));
    DBUG_RETURN(1);
  }
  pthread_mutex_lock(&mi->data_lock);
  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;
      pthread_mutex_unlock(&mi->data_lock);
      DBUG_RETURN(1);
    }
    inc_pos= 0;
    break;
  default:
    inc_pos= event_len;
    break;
  }
  if (unlikely(rli->relay_log.append(ev)))
  {
    delete ev;
    pthread_mutex_unlock(&mi->data_lock);
    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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3509
  DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520
  pthread_mutex_unlock(&mi->data_lock);
  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.

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  TODO:
3522 3523 3524 3525
    Test this code before release - it has to be tested on a separate
    setup with 3.23 master or 4.0 master
*/

3526
static int queue_old_event(Master_info *mi, const char *buf,
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                           ulong event_len)
3528
{
3529 3530
  DBUG_ENTER("queue_old_event");

3531 3532 3533
  switch (mi->rli.relay_log.description_event_for_queue->binlog_version)
  {
  case 1:
3534
      DBUG_RETURN(queue_binlog_ver_1_event(mi,buf,event_len));
3535
  case 3:
3536
      DBUG_RETURN(queue_binlog_ver_3_event(mi,buf,event_len));
3537 3538
  default: /* unsupported format; eg version 2 */
    DBUG_PRINT("info",("unsupported binlog format %d in queue_old_event()",
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3539
                       mi->rli.relay_log.description_event_for_queue->binlog_version));
3540
    DBUG_RETURN(1);
3541 3542
  }
}
3543

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/*
3545 3546
  queue_event()

3547 3548 3549 3550 3551
  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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*/

3554
static int queue_event(Master_info* mi,const char* buf, ulong event_len)
3555
{
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3556 3557
  int error= 0;
  ulong inc_pos;
3558
  Relay_log_info *rli= &mi->rli;
3559
  pthread_mutex_t *log_lock= rli->relay_log.get_log_lock();
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  DBUG_ENTER("queue_event");

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  LINT_INIT(inc_pos);

3564 3565
  if (mi->rli.relay_log.description_event_for_queue->binlog_version<4 &&
      buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT /* a way to escape */)
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    DBUG_RETURN(queue_old_event(mi,buf,event_len));
3567

3568
  LINT_INIT(inc_pos);
3569
  pthread_mutex_lock(&mi->data_lock);
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3570

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3571
  switch (buf[EVENT_TYPE_OFFSET]) {
3572
  case STOP_EVENT:
3573 3574
    /*
      We needn't write this event to the relay log. Indeed, it just indicates a
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3575 3576 3577
      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
3578
      prepared statements' deletion are TODO only when we binlog prep stmts).
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3579

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3580 3581 3582 3583
      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).
3584 3585
    */
    goto err;
3586 3587
  case ROTATE_EVENT:
  {
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3588
    Rotate_log_event rev(buf,event_len,mi->rli.relay_log.description_event_for_queue);
3589
    if (unlikely(process_io_rotate(mi,&rev)))
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3590
    {
3591 3592
      error= 1;
      goto err;
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3593
    }
3594 3595 3596 3597
    /*
      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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3598
    inc_pos= 0;
3599 3600
    break;
  }
3601 3602 3603 3604 3605 3606 3607
  case FORMAT_DESCRIPTION_EVENT:
  {
    /*
      Create an event, and save it (when we rotate the relay log, we will have
      to write this event again).
    */
    /*
3608 3609 3610
      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).
3611
    */
3612
    Format_description_log_event* tmp;
3613
    const char* errmsg;
3614
    if (!(tmp= (Format_description_log_event*)
3615
          Log_event::read_log_event(buf, event_len, &errmsg,
3616
                                    mi->rli.relay_log.description_event_for_queue)))
3617 3618 3619 3620
    {
      error= 2;
      goto err;
    }
3621 3622
    delete mi->rli.relay_log.description_event_for_queue;
    mi->rli.relay_log.description_event_for_queue= tmp;
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3623
    /*
3624
       Though this does some conversion to the slave's format, this will
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3625
       preserve the master's binlog format version, and number of event types.
3626
    */
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3627
    /*
3628
       If the event was not requested by the slave (the slave did not ask for
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3629
       it), i.e. has end_log_pos=0, we do not increment mi->master_log_pos
3630 3631 3632
    */
    inc_pos= uint4korr(buf+LOG_POS_OFFSET) ? event_len : 0;
    DBUG_PRINT("info",("binlog format is now %d",
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3633
                       mi->rli.relay_log.description_event_for_queue->binlog_version));
3634 3635 3636

  }
  break;
3637
  default:
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3638
    inc_pos= event_len;
3639 3640
    break;
  }
3641

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3642 3643
  /*
     If this event is originating from this server, don't queue it.
3644
     We don't check this for 3.23 events because it's simpler like this; 3.23
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3645 3646
     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
3647 3648 3649 3650 3651 3652 3653 3654
     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!).
  */

3655 3656
  pthread_mutex_lock(log_lock);

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3657
  if ((uint4korr(buf + SERVER_ID_OFFSET) == ::server_id) &&
3658
      !mi->rli.replicate_same_server_id)
3659
  {
3660 3661
    /*
      Do not write it to the relay log.
3662 3663 3664 3665 3666 3667 3668 3669
      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.
3670 3671 3672
      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.
3673
    */
3674 3675 3676
    if (buf[EVENT_TYPE_OFFSET]!=FORMAT_DESCRIPTION_EVENT &&
        buf[EVENT_TYPE_OFFSET]!=ROTATE_EVENT &&
        buf[EVENT_TYPE_OFFSET]!=STOP_EVENT)
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3677
    {
3678
      mi->master_log_pos+= inc_pos;
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3679 3680 3681 3682
      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;
    }
3683
    rli->relay_log.signal_update(); // the slave SQL thread needs to re-check
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3684
    DBUG_PRINT("info", ("master_log_pos: %lu, event originating from the same server, ignored",
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                        (ulong) mi->master_log_pos));
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3686
  }
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3687 3688 3689
  else
  {
    /* write the event to the relay log */
3690
    if (likely(!(rli->relay_log.appendv(buf,event_len,0))))
3691 3692
    {
      mi->master_log_pos+= inc_pos;
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3693
      DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
3694 3695
      rli->relay_log.harvest_bytes_written(&rli->log_space_total);
    }
3696
    else
3697
      error= 3;
3698
    rli->ign_master_log_name_end[0]= 0; // last event is not ignored
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3699
  }
3700
  pthread_mutex_unlock(log_lock);
3701 3702 3703


err:
3704
  pthread_mutex_unlock(&mi->data_lock);
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3705
  DBUG_PRINT("info", ("error: %d", error));
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3706
  DBUG_RETURN(error);
3707 3708
}

3709

3710
void end_relay_log_info(Relay_log_info* rli)
3711
{
3712 3713
  DBUG_ENTER("end_relay_log_info");

3714
  if (!rli->inited)
3715
    DBUG_VOID_RETURN;
3716
  if (rli->info_fd >= 0)
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3717 3718
  {
    end_io_cache(&rli->info_file);
3719
    (void) my_close(rli->info_fd, MYF(MY_WME));
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3720 3721
    rli->info_fd = -1;
  }
3722
  if (rli->cur_log_fd >= 0)
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3723 3724 3725 3726 3727
  {
    end_io_cache(&rli->cache_buf);
    (void)my_close(rli->cur_log_fd, MYF(MY_WME));
    rli->cur_log_fd = -1;
  }
3728
  rli->inited = 0;
3729
  rli->relay_log.close(LOG_CLOSE_INDEX | LOG_CLOSE_STOP_EVENT);
3730
  rli->relay_log.harvest_bytes_written(&rli->log_space_total);
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3731 3732 3733 3734 3735 3736
  /*
    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();
3737
  DBUG_VOID_RETURN;
3738 3739
}

3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758

/**
  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;
3759
  if (thd && thd->slave_thread)
3760 3761 3762 3763 3764
    thd->clear_active_vio();
#endif
}


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3765 3766
/*
  Try to connect until successful or slave killed
3767

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3768 3769
  SYNPOSIS
    safe_connect()
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3770 3771 3772
    thd                 Thread handler for slave
    mysql               MySQL connection handle
    mi                  Replication handle
3773

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3774
  RETURN
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3775 3776
    0   ok
    #   Error
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3777
*/
3778

3779
static int safe_connect(THD* thd, MYSQL* mysql, Master_info* mi)
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3780
{
3781 3782 3783
  DBUG_ENTER("safe_connect");

  DBUG_RETURN(connect_to_master(thd, mysql, mi, 0, 0));
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3784 3785
}

3786

3787
/*
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3788 3789
  SYNPOSIS
    connect_to_master()
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3790

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3791 3792 3793
  IMPLEMENTATION
    Try to connect until successful or slave killed or we have retried
    master_retry_count times
3794
*/
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3795

3796
static int connect_to_master(THD* thd, MYSQL* mysql, Master_info* mi,
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3797
                             bool reconnect, bool suppress_warnings)
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3798
{
3799
  int slave_was_killed;
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3800
  int last_errno= -2;                           // impossible error
3801
  ulong err_count=0;
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3802
  char llbuff[22];
3803
  DBUG_ENTER("connect_to_master");
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3804

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3805
#ifndef DBUG_OFF
3806
  mi->events_till_disconnect = disconnect_slave_event_count;
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3807
#endif
3808
  ulong client_flag= CLIENT_REMEMBER_OPTIONS;
3809
  if (opt_slave_compressed_protocol)
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3810
    client_flag=CLIENT_COMPRESS;                /* We will use compression */
3811

3812 3813
  mysql_options(mysql, MYSQL_OPT_CONNECT_TIMEOUT, (char *) &slave_net_timeout);
  mysql_options(mysql, MYSQL_OPT_READ_TIMEOUT, (char *) &slave_net_timeout);
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3814

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3815 3816
#ifdef HAVE_OPENSSL
  if (mi->ssl)
3817
  {
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3818
    mysql_ssl_set(mysql,
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3819
                  mi->ssl_key[0]?mi->ssl_key:0,
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3820
                  mi->ssl_cert[0]?mi->ssl_cert:0,
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3821 3822 3823
                  mi->ssl_ca[0]?mi->ssl_ca:0,
                  mi->ssl_capath[0]?mi->ssl_capath:0,
                  mi->ssl_cipher[0]?mi->ssl_cipher:0);
3824 3825 3826
    mysql_options(mysql, MYSQL_OPT_SSL_VERIFY_SERVER_CERT,
                  &mi->ssl_verify_server_cert);
  }
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3827 3828
#endif

3829 3830 3831 3832
  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);

3833
  while (!(slave_was_killed = io_slave_killed(thd,mi)) &&
unknown's avatar
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3834 3835 3836
         (reconnect ? mysql_reconnect(mysql) != 0 :
          mysql_real_connect(mysql, mi->host, mi->user, mi->password, 0,
                             mi->port, 0, client_flag) == 0))
unknown's avatar
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3837
  {
3838
    /* Don't repeat last error */
unknown's avatar
SCRUM  
unknown committed
3839
    if ((int)mysql_errno(mysql) != last_errno)
3840
    {
unknown's avatar
SCRUM  
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3841
      last_errno=mysql_errno(mysql);
unknown's avatar
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3842
      suppress_warnings= 0;
3843 3844 3845 3846 3847 3848
      mi->report(ERROR_LEVEL, last_errno,
                 "error %s to master '%s@%s:%d'"
                 " - retry-time: %d  retries: %lu",
                 (reconnect ? "reconnecting" : "connecting"),
                 mi->user, mi->host, mi->port,
                 mi->connect_retry, master_retry_count);
3849
    }
unknown's avatar
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3850 3851 3852
    /*
      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
3853
      do not want to have election triggered on the first failure to
unknown's avatar
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3854
      connect
3855
    */
3856
    if (++err_count == master_retry_count)
3857 3858
    {
      slave_was_killed=1;
unknown's avatar
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3859 3860
      if (reconnect)
        change_rpl_status(RPL_ACTIVE_SLAVE,RPL_LOST_SOLDIER);
3861 3862
      break;
    }
3863
    safe_sleep(thd,mi->connect_retry,(CHECK_KILLED_FUNC)io_slave_killed,
unknown's avatar
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3864
               (void*)mi);
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3865
  }
3866

3867 3868
  if (!slave_was_killed)
  {
3869
    mi->clear_error(); // clear possible left over reconnect error
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3870
    if (reconnect)
unknown's avatar
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3871
    {
3872
      if (!suppress_warnings && global_system_variables.log_warnings)
unknown's avatar
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3873
        sql_print_information("Slave: connected to master '%s@%s:%d',\
3874
replication resumed in log '%s' at position %s", mi->user,
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3875 3876 3877
                        mi->host, mi->port,
                        IO_RPL_LOG_NAME,
                        llstr(mi->master_log_pos,llbuff));
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3878
    }
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3879 3880 3881
    else
    {
      change_rpl_status(RPL_IDLE_SLAVE,RPL_ACTIVE_SLAVE);
3882 3883
      general_log_print(thd, COM_CONNECT_OUT, "%s@%s:%d",
                        mi->user, mi->host, mi->port);
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3884
    }
3885
#ifdef SIGNAL_WITH_VIO_CLOSE
3886
    thd->set_active_vio(mysql->net.vio);
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3887
#endif
3888
  }
3889
  mysql->reconnect= 1;
3890 3891
  DBUG_PRINT("exit",("slave_was_killed: %d", slave_was_killed));
  DBUG_RETURN(slave_was_killed);
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3892 3893
}

3894

unknown's avatar
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3895
/*
3896
  safe_reconnect()
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3897

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3898 3899 3900
  IMPLEMENTATION
    Try to connect until successful or slave killed or we have retried
    master_retry_count times
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3901 3902
*/

3903
static int safe_reconnect(THD* thd, MYSQL* mysql, Master_info* mi,
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3904
                          bool suppress_warnings)
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3905
{
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3906 3907
  DBUG_ENTER("safe_reconnect");
  DBUG_RETURN(connect_to_master(thd, mysql, mi, 1, suppress_warnings));
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3908 3909
}

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3910

3911 3912 3913 3914 3915 3916
/*
  Store the file and position where the execute-slave thread are in the
  relay log.

  SYNOPSIS
    flush_relay_log_info()
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3917
    rli                 Relay log information
3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935

  NOTES
    - As this is only called by the slave thread, we don't need to
      have a lock on this.
    - 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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3936 3937
    0   ok
    1   write error
3938 3939
*/

3940
bool flush_relay_log_info(Relay_log_info* rli)
3941
{
3942
  bool error=0;
3943
  DBUG_ENTER("flush_relay_log_info");
3944 3945

  if (unlikely(rli->no_storage))
3946
    DBUG_RETURN(0);
3947

3948 3949 3950
  IO_CACHE *file = &rli->info_file;
  char buff[FN_REFLEN*2+22*2+4], *pos;

3951
  my_b_seek(file, 0L);
3952
  pos=strmov(buff, rli->group_relay_log_name);
3953
  *pos++='\n';
3954
  pos=longlong2str(rli->group_relay_log_pos, pos, 10);
3955
  *pos++='\n';
3956
  pos=strmov(pos, rli->group_master_log_name);
3957
  *pos++='\n';
3958
  pos=longlong2str(rli->group_master_log_pos, pos, 10);
3959
  *pos='\n';
3960
  if (my_b_write(file, (uchar*) buff, (size_t) (pos-buff)+1))
3961 3962 3963
    error=1;
  if (flush_io_cache(file))
    error=1;
3964

3965
  /* Flushing the relay log is done by the slave I/O thread */
3966
  DBUG_RETURN(error);
3967 3968
}

3969

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3970
/*
3971
  Called when we notice that the current "hot" log got rotated under our feet.
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3972 3973
*/

3974
static IO_CACHE *reopen_relay_log(Relay_log_info *rli, const char **errmsg)
3975
{
3976
  DBUG_ENTER("reopen_relay_log");
3977 3978
  DBUG_ASSERT(rli->cur_log != &rli->cache_buf);
  DBUG_ASSERT(rli->cur_log_fd == -1);
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3979 3980

  IO_CACHE *cur_log = rli->cur_log=&rli->cache_buf;
3981
  if ((rli->cur_log_fd=open_binlog(cur_log,rli->event_relay_log_name,
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3982
                                   errmsg)) <0)
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3983
    DBUG_RETURN(0);
3984 3985
  /*
    We want to start exactly where we was before:
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3986 3987
    relay_log_pos       Current log pos
    pending             Number of bytes already processed from the event
3988
  */
3989
  rli->event_relay_log_pos= max(rli->event_relay_log_pos, BIN_LOG_HEADER_SIZE);
3990
  my_b_seek(cur_log,rli->event_relay_log_pos);
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3991
  DBUG_RETURN(cur_log);
3992 3993
}

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3994

3995 3996 3997 3998 3999 4000 4001 4002 4003 4004
/**
  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.
*/
4005
static Log_event* next_event(Relay_log_info* rli)
4006 4007 4008
{
  Log_event* ev;
  IO_CACHE* cur_log = rli->cur_log;
4009
  pthread_mutex_t *log_lock = rli->relay_log.get_log_lock();
4010 4011
  const char* errmsg=0;
  THD* thd = rli->sql_thd;
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4012
  DBUG_ENTER("next_event");
4013

4014 4015
  DBUG_ASSERT(thd != 0);

4016 4017 4018 4019 4020
#ifndef DBUG_OFF
  if (abort_slave_event_count && !rli->events_till_abort--)
    DBUG_RETURN(0);
#endif

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4021 4022
  /*
    For most operations we need to protect rli members with data_lock,
4023 4024 4025 4026
    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
    pthread_cond_wait() with the non-data_lock mutex
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4027
  */
4028
  safe_mutex_assert_owner(&rli->data_lock);
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4029

4030
  while (!sql_slave_killed(thd,rli))
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4031 4032 4033
  {
    /*
      We can have two kinds of log reading:
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4034 4035 4036 4037 4038 4039 4040 4041
      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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4042
    */
4043 4044 4045 4046 4047
    bool hot_log;
    if ((hot_log = (cur_log != &rli->cache_buf)))
    {
      DBUG_ASSERT(rli->cur_log_fd == -1); // foreign descriptor
      pthread_mutex_lock(log_lock);
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4048 4049

      /*
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4050 4051
        Reading xxx_file_id is safe because the log will only
        be rotated when we hold relay_log.LOCK_log
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4052
      */
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4053
      if (rli->relay_log.get_open_count() != rli->cur_log_old_open_count)
4054
      {
unknown's avatar
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4055 4056 4057 4058 4059 4060
        // The master has switched to a new log file; Reopen the old log file
        cur_log=reopen_relay_log(rli, &errmsg);
        pthread_mutex_unlock(log_lock);
        if (!cur_log)                           // No more log files
          goto err;
        hot_log=0;                              // Using old binary log
4061 4062
      }
    }
4063 4064 4065 4066 4067 4068 4069
    /* 
      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;
4070 4071
#ifndef DBUG_OFF
    {
4072
      /* This is an assertion which sometimes fails, let's try to track it */
4073
      char llbuf1[22], llbuf2[22];
4074
      DBUG_PRINT("info", ("my_b_tell(cur_log)=%s rli->event_relay_log_pos=%s",
4075
                          llstr(my_b_tell(cur_log),llbuf1),
4076 4077 4078
                          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);
4079 4080
    }
#endif
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4081 4082
    /*
      Relay log is always in new format - if the master is 3.23, the
4083
      I/O thread will convert the format for us.
4084 4085
      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
4086 4087
      logs, which may even have been deleted. So we need to write this
      description event at the beginning of the relay log.
4088 4089
      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.
4090
      But if the relay log is created by new_file(): then the solution is:
4091
      MYSQL_BIN_LOG::open() will write the buffered description event.
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4092
    */
4093 4094
    if ((ev=Log_event::read_log_event(cur_log,0,
                                      rli->relay_log.description_event_for_exec)))
4095

4096 4097
    {
      DBUG_ASSERT(thd==rli->sql_thd);
4098 4099 4100 4101 4102
      /*
        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);
4103
      if (hot_log)
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        pthread_mutex_unlock(log_lock);
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      DBUG_RETURN(ev);
4106 4107
    }
    DBUG_ASSERT(thd==rli->sql_thd);
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4108
    if (opt_reckless_slave)                     // For mysql-test
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      cur_log->error = 0;
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    if (cur_log->error < 0)
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    {
      errmsg = "slave SQL thread aborted because of I/O error";
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      if (hot_log)
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        pthread_mutex_unlock(log_lock);
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      goto err;
    }
4117 4118
    if (!cur_log->error) /* EOF */
    {
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      /*
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        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
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4123
      */
4124 4125
      if (hot_log)
      {
4126 4127 4128 4129 4130 4131 4132 4133 4134 4135
        /*
          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").
4136 4137 4138 4139 4140 4141 4142 4143 4144 4145

          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.
4146
        */
4147
        time_t save_timestamp= rli->last_master_timestamp;
4148 4149
        rli->last_master_timestamp= 0;

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4150
        DBUG_ASSERT(rli->relay_log.get_open_count() ==
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4151
                    rli->cur_log_old_open_count);
4152 4153 4154 4155 4156

        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"));
4157
          ev= new Rotate_log_event(rli->ign_master_log_name_end,
4158
                                   0, rli->ign_master_log_pos_end,
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                                   Rotate_log_event::DUP_NAME);
4160
          rli->ign_master_log_name_end[0]= 0;
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          pthread_mutex_unlock(log_lock);
4162 4163 4164 4165 4166 4167 4168 4169 4170 4171
          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);
        }

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4172 4173 4174 4175 4176
        /*
          We can, and should release data_lock while we are waiting for
          update. If we do not, show slave status will block
        */
        pthread_mutex_unlock(&rli->data_lock);
4177 4178

        /*
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4179
          Possible deadlock :
4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190
          - 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
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4191
          master does not send anything). Then the I/O thread stops waiting
4192 4193
          and reads more events.
          The SQL thread decides when the I/O thread should take log_space_limit
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4194
          into account again : ignore_log_space_limit is reset to 0
4195 4196 4197 4198
          in purge_first_log (when the SQL thread purges the just-read relay
          log), and also when the SQL thread starts. 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
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4199 4200
          be stopped, and the SQL thread sets ignore_log_space_limit to 0 when
          it stops.
4201 4202 4203
        */
        pthread_mutex_lock(&rli->log_space_lock);
        // prevent the I/O thread from blocking next times
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        rli->ignore_log_space_limit= 1;
4205
        /*
4206 4207 4208 4209
          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.
4210
        */
4211
        pthread_mutex_unlock(&rli->log_space_lock);
4212
        pthread_cond_broadcast(&rli->log_space_cond);
4213
        // Note that wait_for_update unlocks lock_log !
4214
        rli->relay_log.wait_for_update(rli->sql_thd, 1);
4215 4216
        // re-acquire data lock since we released it earlier
        pthread_mutex_lock(&rli->data_lock);
4217
        rli->last_master_timestamp= save_timestamp;
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4218
        continue;
4219
      }
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4220
      /*
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4221 4222 4223
        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
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4224 4225 4226 4227 4228
      */
      end_io_cache(cur_log);
      DBUG_ASSERT(rli->cur_log_fd >= 0);
      my_close(rli->cur_log_fd, MYF(MY_WME));
      rli->cur_log_fd = -1;
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4229

4230
      if (relay_log_purge)
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4231
      {
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4232
        /*
4233 4234 4235 4236 4237 4238 4239 4240 4241 4242
          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
        */
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4243
        if (rli->relay_log.purge_first_log
4244 4245 4246
            (rli,
             rli->group_relay_log_pos == rli->event_relay_log_pos
             && !strcmp(rli->group_relay_log_name,rli->event_relay_log_name)))
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4247 4248 4249 4250
        {
          errmsg = "Error purging processed logs";
          goto err;
        }
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4251
      }
4252 4253
      else
      {
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4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269
        /*
          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);
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4270
      }
4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284

      /*
        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 */
        pthread_mutex_lock(log_lock);
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4285 4286
      if (rli->relay_log.is_active(rli->linfo.log_file_name))
      {
4287
#ifdef EXTRA_DEBUG
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4288 4289
        if (global_system_variables.log_warnings)
          sql_print_information("next log '%s' is currently active",
4290
                                rli->linfo.log_file_name);
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4291 4292 4293 4294 4295 4296 4297 4298
#endif
        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);

        /*
          Read pointer has to be at the start since we are the only
          reader.
4299 4300 4301
          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).
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4302 4303
        */
        if (check_binlog_magic(cur_log,&errmsg))
4304 4305
        {
          if (!hot_log) pthread_mutex_unlock(log_lock);
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4306
          goto err;
4307 4308
        }
        if (!hot_log) pthread_mutex_unlock(log_lock);
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4309
        continue;
4310
      }
4311
      if (!hot_log) pthread_mutex_unlock(log_lock);
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4312
      /*
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4313 4314 4315
        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.
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4316 4317
      */
#ifdef EXTRA_DEBUG
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4318
      if (global_system_variables.log_warnings)
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4319
        sql_print_information("next log '%s' is not active",
4320
                              rli->linfo.log_file_name);
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4321
#endif
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4322 4323
      // open_binlog() will check the magic header
      if ((rli->cur_log_fd=open_binlog(cur_log,rli->linfo.log_file_name,
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4324 4325
                                       &errmsg)) <0)
        goto err;
4326
    }
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4327
    else
4328
    {
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4329
      /*
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4330 4331
        Read failed with a non-EOF error.
        TODO: come up with something better to handle this error
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4332 4333
      */
      if (hot_log)
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4334
        pthread_mutex_unlock(log_lock);
4335
      sql_print_error("Slave SQL thread: I/O error reading \
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4336
event(errno: %d  cur_log->error: %d)",
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4337
                      my_errno,cur_log->error);
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4338
      // set read position to the beginning of the event
4339
      my_b_seek(cur_log,rli->event_relay_log_pos);
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4340 4341
      /* otherwise, we have had a partial read */
      errmsg = "Aborting slave SQL thread because of partial event read";
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4342
      break;                                    // To end of function
4343 4344
    }
  }
4345
  if (!errmsg && global_system_variables.log_warnings)
4346
  {
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4347
    sql_print_information("Error reading relay log event: %s",
4348 4349 4350
                          "slave SQL thread was killed");
    DBUG_RETURN(0);
  }
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4351

4352
err:
4353 4354
  if (errmsg)
    sql_print_error("Error reading relay log event: %s", errmsg);
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4355
  DBUG_RETURN(0);
4356 4357
}

4358 4359 4360
/*
  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
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4361
  locks; here we don't, so this function is mainly taking locks).
4362 4363
  Returns nothing as we cannot catch any error (MYSQL_BIN_LOG::new_file()
  is void).
4364 4365
*/

4366
void rotate_relay_log(Master_info* mi)
4367 4368
{
  DBUG_ENTER("rotate_relay_log");
4369
  Relay_log_info* rli= &mi->rli;
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4370

4371 4372 4373
  /* We don't lock rli->run_lock. This would lead to deadlocks. */
  pthread_mutex_lock(&mi->run_lock);

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4374
  /*
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4375 4376 4377
     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).
  */
4378 4379
  if (!rli->inited)
  {
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4380
    DBUG_PRINT("info", ("rli->inited == 0"));
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4381
    goto end;
4382
  }
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4383

4384
  /* If the relay log is closed, new_file() will do nothing. */
4385
  rli->relay_log.new_file();
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4386

4387 4388 4389 4390
  /*
    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:
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4391 4392 4393 4394 4395 4396
    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.
4397 4398 4399 4400
    If the log is closed, then this will just harvest the last writes, probably
    0 as they probably have been harvested.
  */
  rli->relay_log.harvest_bytes_written(&rli->log_space_total);
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end:
4402
  pthread_mutex_unlock(&mi->run_lock);
4403 4404 4405
  DBUG_VOID_RETURN;
}

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4406

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/**
   Detects, based on master's version (as found in the relay log), if master
   has a certain bug.
4410
   @param rli Relay_log_info which tells the master's version
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   @param bug_id Number of the bug as found in bugs.mysql.com
4412
   @param report bool report error message, default TRUE
4413 4414 4415 4416 4417 4418 4419

   @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.

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   @return TRUE if master has the bug, FALSE if it does not.
*/
4422 4423
bool rpl_master_has_bug(const Relay_log_info *rli, uint bug_id, bool report,
                        bool (*pred)(const void *), const void *param)
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{
  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[]=
  {
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    {24432, { 5, 0, 24 }, { 5, 0, 38 } },
4433 4434 4435
    {24432, { 5, 1, 12 }, { 5, 1, 17 } },
    {33029, { 5, 0,  0 }, { 5, 0, 58 } },
    {33029, { 5, 1,  0 }, { 5, 1, 12 } },
4436
    {37426, { 5, 1,  0 }, { 5, 1, 26 } },
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  };
  const uchar *master_ver=
    rli->relay_log.description_event_for_exec->server_version_split;

  DBUG_ASSERT(sizeof(rli->relay_log.description_event_for_exec->server_version_split) == 3);

  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) &&
4450 4451
        (memcmp(fixed_in,      master_ver, 3) >  0) &&
        (pred == NULL || (*pred)(param)))
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4452
    {
4453 4454
      if (!report)
	return TRUE;
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      // 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);
4460
      // a verbose message for the error log
4461 4462 4463
      rli->report(ERROR_LEVEL, ER_UNKNOWN_ERROR,
                  "According to the master's version ('%s'),"
                  " it is probable that master suffers from this bug:"
4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479
                      " 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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      return TRUE;
    }
  }
  return FALSE;
}

4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500
/**
   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)
{
  if (active_mi && active_mi->rli.sql_thd == thd)
  {
    Relay_log_info *rli= &active_mi->rli;
4501
    DBUG_EXECUTE_IF("simulate_bug33029", return TRUE;);
4502
    return rpl_master_has_bug(rli, 33029, FALSE, NULL, NULL);
4503 4504 4505 4506
  }
  return FALSE;
}

4507
#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
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template class I_List_iterator<i_string>;
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template class I_List_iterator<i_string_pair>;
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#endif
4511

4512 4513 4514 4515
/**
  @} (end of group Replication)
*/

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#endif /* HAVE_REPLICATION */