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MDEV-5769: Slave crashes on attempt to do parallel replication from an older master

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Older master has no GTID events, so such events are not available for
deciding on scheduling of event groups and so on.

With this patch, we run such events from old masters single-threaded, in the
sql driver thread.

This seems better than trying to make the parallel code handle the data from
older masters; while possible, this would require a lot of testing (as well as
possibly some extra overhead in the scheduling of events), which hardly seems
worthwhile.
This commit is contained in:
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2014-03-04 08:48:32 +01:00
parent 641feed481
commit ec374f1e53
6 changed files with 134 additions and 45 deletions
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3
sql/rpl_parallel.h
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@ -225,8 +225,7 @@ struct rpl_parallel {
void wait_for_done(THD *thd, Relay_log_info *rli);
void stop_during_until();
bool workers_idle();
bool do_event(rpl_group_info *serial_rgi, Log_event *ev,
ulonglong event_size);
int do_event(rpl_group_info *serial_rgi, Log_event *ev, ulonglong event_size);
};