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c75905cacb
rpl.rpl_seconds_behind_master_spike uses the DEBUG_SYNC mechanism to count how many format descriptor events (FDEs) have been executed, to attempt to pause on a specific relay log FDE after executing transactions. However, depending on when the IO thread is stopped, it can send an extra FDE before sending the transactions, forcing the test to pause before executing any transactions, resulting in a table not existing, that is attempted to be read for COUNT. This patch fixes this by no longer counting FDEs, but rather by programmatically waiting until the SQL thread has executed the transaction and then automatically activating the DEBUG_SYNC point to trigger at the next relay log FDE.
61 lines
1.9 KiB
Plaintext
61 lines
1.9 KiB
Plaintext
include/master-slave.inc
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[connection master]
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connection slave;
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include/stop_slave.inc
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SET @save_dbug= @@GLOBAL.debug_dbug;
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SET @@global.debug_dbug="+d,pause_sql_thread_on_relay_fde_after_trans";
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SET @@global.debug_dbug="+d,negate_clock_diff_with_master";
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include/start_slave.inc
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# Future events must be logged at least 2 seconds after
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# the slave starts
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connection master;
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# Write events to ensure slave will be consistent with master
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create table t1 (a int);
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insert into t1 values (1);
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# Flush logs on master forces slave to generate a Format description
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# event in its relay log
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flush logs;
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connection slave;
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# On the next FDE, the slave should have the master CREATE/INSERT events
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SET DEBUG_SYNC='now WAIT_FOR paused_on_fde';
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select count(*)=1 from t1;
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count(*)=1
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1
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# The relay log FDE has been processed - here we check to ensure it was
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# not considered in Seconds_Behind_Master calculation
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connection slave1;
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# Safely resume slave SQL thread
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# Prove SQL thread is in state "debug sync point: now"
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SET @@global.debug_dbug="-d,pause_sql_thread_on_fde";
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SET DEBUG_SYNC='now SIGNAL sql_thread_continue';
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# Wait for SQL thread to continue into normal execution
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SET DEBUG_SYNC='RESET';
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#
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# MDEV-29639
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# When receiving an event after the SQL Thread idles,
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# Seconds_Behind_Master should not update before it updates
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# last_master_timestamp
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connection slave;
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include/stop_slave.inc
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set @@global.debug_dbug="+d,pause_sql_thread_on_next_event";
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include/start_slave.inc
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connection master;
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insert into t1 values(2);
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include/save_master_gtid.inc
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connection slave;
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set debug_sync='now wait_for paused_on_event';
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connection master;
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# Sleeping 1s to create a visible SBM gap between events
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insert into t1 values(3);
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include/save_master_gtid.inc
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connection slave;
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set debug_sync='now wait_for paused_on_event';
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include/stop_slave.inc
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set debug_sync='RESET';
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SET @@global.debug_dbug=$save_dbug;
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include/start_slave.inc
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include/sync_with_master_gtid.inc
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connection master;
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DROP TABLE t1;
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include/rpl_end.inc
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