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MDEV-5195: Race when switching relay log causing crash

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In parallel replication, when the IO thread switches relay log,
the SQL thread re-opens the current relaylog and seeks to the
current position. There was a race that would cause it to
sometimes seek to the wrong position, causing corruption and
crash.
This commit is contained in:
unknown 2013-10-29 11:52:16 +01:00
parent 2fbd1c7307
commit f2799c6828
1 changed files with 1 additions and 0 deletions
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sql/rpl_parallel.cc
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@ -835,6 +835,7 @@ rpl_parallel::do_event(rpl_group_info *serial_rgi, Log_event *ev,
/*
Queue the event for processing.
*/
rli->event_relay_log_pos= rli->future_event_relay_log_pos;
cur_thread->enqueue(qev);
mysql_mutex_unlock(&cur_thread->LOCK_rpl_thread);
mysql_cond_signal(&cur_thread->COND_rpl_thread);