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01cdba58ba
NOTE: this is the backport to next-mr.
When using replication, the slave will not log any slow query logs queries
replicated from the master, even if the option "--log-slow-slave-statements"
is set and these take more than "log_query_time" to execute.
In order to log slow queries in replicated thread one needs to set the
--log-slow-slave-statements, so that the SQL thread is initialized with the
correct switch. Although setting this flag correctly configures the slave
thread option to log slow queries, there is an issue with the condition that
is used to check whether to log the slow query or not. When replaying binlog
events the statement contains the SET TIMESTAMP clause which will force the
slow logging condition check to fail. Consequently, the slow query logging will
not take place.
This patch addresses this issue by removing the second condition from the
log_slow_statements as it prevents slow queries to be binlogged and seems
to be deprecated.
47 lines
1,004 B
Text
47 lines
1,004 B
Text
stop slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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reset master;
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reset slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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start slave;
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include/stop_slave.inc
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SET @old_log_output= @@log_output;
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SET GLOBAL log_output= 'TABLE';
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SET @old_long_query_time= @@long_query_time;
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SET GLOBAL long_query_time= 2;
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TRUNCATE mysql.slow_log;
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include/start_slave.inc
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CREATE TABLE t1 (a int, b int);
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INSERT INTO t1 values(1, 1);
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INSERT INTO t1 values(1, sleep(3));
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TRUNCATE mysql.slow_log;
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SELECT 1, sleep(3);
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1 sleep(3)
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1 0
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SELECT 1;
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1
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1
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TRUNCATE mysql.slow_log;
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SET TIMESTAMP= 1;
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SELECT 2, sleep(3);
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2 sleep(3)
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2 0
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SELECT 2;
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2
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2
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TRUNCATE mysql.slow_log;
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SET @old_slow_query_log= @@slow_query_log;
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SET GLOBAL slow_query_log= 'OFF';
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SELECT 3, sleep(3);
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3 sleep(3)
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3 0
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SELECT 3;
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3
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3
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TRUNCATE mysql.slow_log;
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SET GLOBAL slow_query_log= @old_slow_query_log;
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DROP TABLE t1;
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include/stop_slave.inc
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SET GLOBAL long_query_time= @old_long_query_time;
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SET GLOBAL log_output= @old_log_output;
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include/start_slave.inc
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