WL#5142 FLUSH LOGS should take optional arguments for which log(s) to flush

Support for flushing individual logs, so that the user can
selectively flush a subset of the server logs.

Flush of individual logs is done according to the 
following syntax:

  FLUSH <log_category> LOGS;

The syntax is extended so that the user is able to flush a
subset of logs:

  FLUSH [log_category LOGS,];

where log_category is one of:
  SLOW
  ERROR
  BINARY
  ENGINE
  GENERAL
  RELAY.


mysql-test/suite/rpl/r/rpl_flush_logs.result:
  Test result for WL#5142.
mysql-test/suite/rpl/t/rpl_flush_logs.test:
  Added the test file to verify if the 'flush individual log' 
  statement works fine.
sql/log.cc:
  Added the two functions to flush slow and general log.
sql/sql_parse.cc:
  Added code to flush specified logs against the option.
sql/sql_yacc.yy:
  Added code to parse the 'flush * log' statement syntax and 
  set its option to Lex->type.

include/mysql_com.h

@@ -115,6 +115,12 @@ enum enum_server_command
 					   thread */
 #define REFRESH_MASTER          128     /* Remove all bin logs in the index
 					   and truncate the index */
+#define REFRESH_ERROR_LOG       256 /* Rotate only the erorr log */
+#define REFRESH_ENGINE_LOG      512 /* Flush all storage engine logs */
+#define REFRESH_BINARY_LOG     1024 /* Flush the binary log */
+#define REFRESH_RELAY_LOG      2048 /* Flush the relay log */
+#define REFRESH_GENERAL_LOG    4096 /* Flush the general log */
+#define REFRESH_SLOW_LOG       8192 /* Flush the slow query log */
 
 /* The following can't be set with mysql_refresh() */
 #define REFRESH_READ_LOCK	16384	/* Lock tables for read */

mysql-test/suite/rpl/r/rpl_flush_logs.result

+stop slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+reset master;
+reset slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+start slave;
+# Make sure the 'master_log.err-old' file does not
+# exist before execute 'flush error logs' statement.
+# Test if support 'flush error logs' statement.
+flush error logs;
+# Check the 'master_log.err-old' file is created
+# after executed 'flush error logs' statement.
+# Make sure binary logs was not be flushed
+# after execute 'flush error logs' statement.
+# Make sure relay logs was not be flushed 
+# after execute 'flush error logs' statement.
+# Make sure the 'slave-relay-bin.000004' file does not
+# exist before execute 'flush relay logs' statement.
+# Test if support 'flush relay logs' statement.
+flush relay logs;
+# Check the 'slave-relay-bin.000004' file is created
+# after executed 'flush relay logs' statement.
+# Make sure binary logs was not be flushed
+# after execute 'flush relay logs' statement.
+# Test if support 'flush slow logs' statement.
+flush slow logs;
+# Make sure binary logs was not be flushed
+# after execute 'flush slow logs' statement.
+# Test if support 'flush general logs' statement.
+flush general logs;
+# Make sure binary logs was not be flushed
+# after execute 'flush general logs' statement.
+# Test if support 'flush engine logs' statement.
+flush engine logs;
+# Make sure binary logs was not be flushed
+# after execute 'flush engine logs' statement.
+# Make sure the 'master-bin.000002' file does not
+# exist before execute 'flush binary logs' statement.
+# Test if support 'flush binary logs' statement.
+flush binary logs;
+# Check the 'master-bin.000002' file is created
+# after executed 'flush binary logs' statement.
+# Make sure the 'slave-relay-bin.000007' file does not exist
+# exist before execute 'flush error logs, relay logs' statement.
+# Make sure the 'master_log.err-old' file does not exist
+# before execute 'flush error logs, relay logs' statement.
+# Test if support to combine all kinds of logs into one statement.
+flush error logs, relay logs;
+# Check the 'master_log.err-old' file is created
+# after executed 'flush error logs, relay logs' statement.
+# Make sure binary logs was not be flushed
+# after execute 'flush error logs, relay logs' statement.
+# Check the 'slave-relay-bin.000007' file is created after
+# execute 'flush error logs, relay logs' statement.
+# Make sure the 'slave-relay-bin.000008' and 'slave-relay-bin.000009' 
+# files do not exist before execute 'flush error logs, relay logs' 
+# statement.
+# Make sure the 'master_log.err-old' file does not exist
+# before execute 'flush logs' statement.
+# Test if 'flush logs' statement works fine and flush all the logs.
+flush logs;
+# Check the 'master_log.err-old' file is created
+# after executed 'flush logs' statement.
+# Check 'master-bin.000003' is created
+# after execute 'flush logs' statement.
+# Check the 'slave-relay-bin.000008' and 'slave-relay-bin.000009' 
+# files are created after execute 'flush logs' statement.

mysql-test/suite/rpl/t/rpl_flush_logs-master.opt

+--log-error=$MYSQLTEST_VARDIR/tmp/master_log.err

mysql-test/suite/rpl/t/rpl_flush_logs.test

+#
+# WL#5124
+# This test verifies if the 'flush individual logs' statement 
+# works fine.  
+#
+
+--source include/master-slave.inc
+--source include/have_binlog_format_statement.inc
+connection master;
+
+# Test 'flush error logs' statement.
+--echo # Make sure the 'master_log.err-old' file does not
+--echo # exist before execute 'flush error logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+
+--echo # Test if support 'flush error logs' statement.
+flush error logs;
+
+--echo # Check the 'master_log.err-old' file is created
+--echo # after executed 'flush error logs' statement.
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err;
+
+--echo # Make sure binary logs was not be flushed
+--echo # after execute 'flush error logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+
+sync_slave_with_master;
+--echo # Make sure relay logs was not be flushed 
+--echo # after execute 'flush error logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000004;
+
+
+# Test 'flush relay logs' statement.
+--echo # Make sure the 'slave-relay-bin.000004' file does not
+--echo # exist before execute 'flush relay logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000004;
+
+connection master;
+--echo # Test if support 'flush relay logs' statement.
+flush relay logs;
+
+sync_slave_with_master;
+--echo # Check the 'slave-relay-bin.000004' file is created
+--echo # after executed 'flush relay logs' statement.
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000004;
+
+connection master;
+--echo # Make sure binary logs was not be flushed
+--echo # after execute 'flush relay logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+
+
+# Test 'flush slow logs' statement.
+--echo # Test if support 'flush slow logs' statement.
+flush slow logs;
+
+--echo # Make sure binary logs was not be flushed
+--echo # after execute 'flush slow logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+
+
+# Test 'flush general logs' statement.
+--echo # Test if support 'flush general logs' statement.
+flush general logs;
+
+--echo # Make sure binary logs was not be flushed
+--echo # after execute 'flush general logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+
+
+# Test 'flush engine logs' statement.
+--echo # Test if support 'flush engine logs' statement.
+flush engine logs;
+
+--echo # Make sure binary logs was not be flushed
+--echo # after execute 'flush engine logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+
+
+# Test 'flush binary logs' statement.
+--echo # Make sure the 'master-bin.000002' file does not
+--echo # exist before execute 'flush binary logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+
+--echo # Test if support 'flush binary logs' statement.
+flush binary logs;
+
+--echo # Check the 'master-bin.000002' file is created
+--echo # after executed 'flush binary logs' statement.
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000001;
+
+
+# Test 'flush error logs, relay logs' statement
+sync_slave_with_master;
+--echo # Make sure the 'slave-relay-bin.000007' file does not exist
+--echo # exist before execute 'flush error logs, relay logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000007;
+
+connection master;
+remove_file $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+
+--echo # Make sure the 'master_log.err-old' file does not exist
+--echo # before execute 'flush error logs, relay logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+
+--echo # Test if support to combine all kinds of logs into one statement.
+flush error logs, relay logs;
+
+--echo # Check the 'master_log.err-old' file is created
+--echo # after executed 'flush error logs, relay logs' statement.
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err;
+
+--echo # Make sure binary logs was not be flushed
+--echo # after execute 'flush error logs, relay logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000003;
+
+sync_slave_with_master;
+--echo # Check the 'slave-relay-bin.000007' file is created after
+--echo # execute 'flush error logs, relay logs' statement.
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000007;
+
+
+# Test 'flush logs' statement
+--echo # Make sure the 'slave-relay-bin.000008' and 'slave-relay-bin.000009' 
+--echo # files do not exist before execute 'flush error logs, relay logs' 
+--echo # statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000008;
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000009;
+
+connection master;
+remove_file $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+
+--echo # Make sure the 'master_log.err-old' file does not exist
+--echo # before execute 'flush logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+
+--echo # Test if 'flush logs' statement works fine and flush all the logs.
+flush logs;
+
+--echo # Check the 'master_log.err-old' file is created
+--echo # after executed 'flush logs' statement.
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err;
+
+--echo # Check 'master-bin.000003' is created
+--echo # after execute 'flush logs' statement.
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000003;
+
+sync_slave_with_master;
+--echo # Check the 'slave-relay-bin.000008' and 'slave-relay-bin.000009' 
+--echo # files are created after execute 'flush logs' statement.
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000008;
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000009;
+

sql/lex.h

@@ -189,6 +189,7 @@ static SYMBOL symbols[] = {
   { "ENGINE",		SYM(ENGINE_SYM)},
   { "ENGINES",		SYM(ENGINES_SYM)},
   { "ENUM",		SYM(ENUM)},
+  { "ERROR",            SYM(ERROR_SYM)},
   { "ERRORS",		SYM(ERRORS)},
   { "ESCAPE",		SYM(ESCAPE_SYM)},
   { "ESCAPED",		SYM(ESCAPED)},
@@ -223,6 +224,7 @@ static SYMBOL symbols[] = {
   { "FULL",		SYM(FULL)},
   { "FULLTEXT",		SYM(FULLTEXT_SYM)},
   { "FUNCTION",		SYM(FUNCTION_SYM)},
+  { "GENERAL",          SYM(GENERAL)},
   { "GEOMETRY",		SYM(GEOMETRY_SYM)},
   { "GEOMETRYCOLLECTION",SYM(GEOMETRYCOLLECTION)},
   { "GET_FORMAT",       SYM(GET_FORMAT)},
@@ -429,6 +431,7 @@ static SYMBOL symbols[] = {
   { "REDUNDANT",	SYM(REDUNDANT_SYM)},
   { "REFERENCES",	SYM(REFERENCES)},
   { "REGEXP",		SYM(REGEXP)},
+  { "RELAY",            SYM(RELAY)},
   { "RELAYLOG",         SYM(RELAYLOG_SYM)},
   { "RELAY_LOG_FILE",   SYM(RELAY_LOG_FILE_SYM)},
   { "RELAY_LOG_POS",    SYM(RELAY_LOG_POS_SYM)},
@@ -481,6 +484,7 @@ static SYMBOL symbols[] = {
   { "SIGNED",		SYM(SIGNED_SYM)},
   { "SIMPLE",		SYM(SIMPLE_SYM)},
   { "SLAVE",            SYM(SLAVE)},
+  { "SLOW",             SYM(SLOW)},
   { "SNAPSHOT",         SYM(SNAPSHOT_SYM)},
   { "SMALLINT",		SYM(SMALLINT)},
   { "SOCKET",		SYM(SOCKET_SYM)},

sql/log.cc

@@ -965,6 +965,54 @@ bool LOGGER::flush_logs(THD *thd)
 }
 
 
+/**
+  Close and reopen the slow log (with locks).
+  
+  @returns FALSE.
+*/
+bool LOGGER::flush_slow_log()
+{
+  /*
+    Now we lock logger, as nobody should be able to use logging routines while
+    log tables are closed
+  */
+  logger.lock_exclusive();
+
+  /* Reopen slow log file */
+  if (opt_slow_log)
+    file_log_handler->get_mysql_slow_log()->reopen_file();
+
+  /* End of log flush */
+  logger.unlock();
+
+  return 0;
+}
+
+
+/**
+  Close and reopen the general log (with locks).
+
+  @returns FALSE.
+*/
+bool LOGGER::flush_general_log()
+{
+  /*
+    Now we lock logger, as nobody should be able to use logging routines while
+    log tables are closed
+  */
+  logger.lock_exclusive();
+
+  /* Reopen general log file */
+  if (opt_log)
+    file_log_handler->get_mysql_log()->reopen_file();
+
+  /* End of log flush */
+  logger.unlock();
+
+  return 0;
+}
+
+
 /*
   Log slow query with all enabled log event handlers
 

sql/log.h

@@ -570,6 +570,8 @@ class LOGGER
   void init_base();
   void init_log_tables();
   bool flush_logs(THD *thd);
+  bool flush_slow_log();
+  bool flush_general_log();
   /* Perform basic logger cleanup. this will leave e.g. error log open. */
   void cleanup_base();
   /* Free memory. Nothing could be logged after this function is called */

sql/sql_parse.cc

@@ -6664,6 +6664,30 @@ bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
       tables.
     */
 
+    options|= REFRESH_BINARY_LOG;
+    options|= REFRESH_RELAY_LOG;
+    options|= REFRESH_SLOW_LOG;
+    options|= REFRESH_GENERAL_LOG;
+    options|= REFRESH_ENGINE_LOG;
+    options|= REFRESH_ERROR_LOG;
+  }
+
+  if (options & REFRESH_ERROR_LOG)
+    if (flush_error_log())
+      result= 1;
+
+  if ((options & REFRESH_SLOW_LOG) && opt_slow_log)
+    logger.flush_slow_log();
+
+  if ((options & REFRESH_GENERAL_LOG) && opt_log)
+    logger.flush_general_log();
+
+  if (options & REFRESH_ENGINE_LOG)
+    if (ha_flush_logs(NULL))
+      result= 1;
+
+  if (options & REFRESH_BINARY_LOG)
+  {
     /*
       Writing this command to the binlog may result in infinite loops
       when doing mysqlbinlog|mysql, and anyway it does not really make
@@ -6671,23 +6695,16 @@ bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
       than it would help them)
     */
     tmp_write_to_binlog= 0;
-    if( mysql_bin_log.is_open() )
-    {
+    if (mysql_bin_log.is_open())
       mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
   }
+  if (options & REFRESH_RELAY_LOG)
+  {
 #ifdef HAVE_REPLICATION
     pthread_mutex_lock(&LOCK_active_mi);
     rotate_relay_log(active_mi);
     pthread_mutex_unlock(&LOCK_active_mi);
 #endif
-
-    /* flush slow and general logs */
-    logger.flush_logs(thd);
-
-    if (ha_flush_logs(NULL))
-      result=1;
-    if (flush_error_log())
-      result=1;
   }
 #ifdef HAVE_QUERY_CACHE
   if (options & REFRESH_QUERY_CACHE_FREE)

sql/sql_yacc.yy

@@ -681,6 +681,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %token  ENUM
 %token  EQ                            /* OPERATOR */
 %token  EQUAL_SYM                     /* OPERATOR */
+%token  ERROR_SYM
 %token  ERRORS
 %token  ESCAPED
 %token  ESCAPE_SYM                    /* SQL-2003-R */
@@ -714,6 +715,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %token  FULLTEXT_SYM
 %token  FUNCTION_SYM                  /* SQL-2003-R */
 %token  GE
+%token  GENERAL
 %token  GEOMETRYCOLLECTION
 %token  GEOMETRY_SYM
 %token  GET_FORMAT                    /* MYSQL-FUNC */
@@ -931,6 +933,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %token  REDUNDANT_SYM
 %token  REFERENCES                    /* SQL-2003-R */
 %token  REGEXP
+%token  RELAY
 %token  RELAYLOG_SYM
 %token  RELAY_LOG_FILE_SYM
 %token  RELAY_LOG_POS_SYM
@@ -985,6 +988,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %token  SIGNED_SYM
 %token  SIMPLE_SYM                    /* SQL-2003-N */
 %token  SLAVE
+%token  SLOW
 %token  SMALLINT                      /* SQL-2003-R */
 %token  SNAPSHOT_SYM
 %token  SOCKET_SYM
@@ -10313,6 +10317,18 @@ flush_option:
           opt_table_list {}
         | TABLES WITH READ_SYM LOCK_SYM
           { Lex->type|= REFRESH_TABLES | REFRESH_READ_LOCK; }
+        | ERROR_SYM LOGS_SYM
+          { Lex->type|= REFRESH_ERROR_LOG; }
+        | ENGINE_SYM LOGS_SYM
+          { Lex->type|= REFRESH_ENGINE_LOG; } 
+        | GENERAL LOGS_SYM
+          { Lex->type|= REFRESH_GENERAL_LOG; }
+        | SLOW LOGS_SYM
+          { Lex->type|= REFRESH_SLOW_LOG; }
+        | BINARY LOGS_SYM
+          { Lex->type|= REFRESH_BINARY_LOG; }
+        | RELAY LOGS_SYM
+          { Lex->type|= REFRESH_RELAY_LOG; }
         | QUERY_SYM CACHE_SYM
           { Lex->type|= REFRESH_QUERY_CACHE_FREE; }
         | HOSTS_SYM
@@ -11436,6 +11452,7 @@ keyword_sp:
         | ENUM                     {}
         | ENGINE_SYM               {}
         | ENGINES_SYM              {}
+        | ERROR_SYM                {}
         | ERRORS                   {}
         | ESCAPE_SYM               {}
         | EVENT_SYM                {}
@@ -11560,6 +11577,7 @@ keyword_sp:
         | REDO_BUFFER_SIZE_SYM     {}
         | REDOFILE_SYM             {}
         | REDUNDANT_SYM            {}
+        | RELAY                    {}
         | RELAYLOG_SYM             {}
         | RELAY_LOG_FILE_SYM       {}
         | RELAY_LOG_POS_SYM        {}