Add another test case.
Fix bug found: When one thread aborts, another thread might
wrongly advance the relay log position too far, causing the
fauling transaction to be skipped and thus lost upon
restarting the SQL thread after the failure.
Add a test case for killing a waiting query in parallel replication.
Fix several bugs found:
- We should not wakeup_subsequent_commits() in ha_rollback_trans(), since we
do not know the right wakeup_error() to give.
- When a wait_for_prior_commit() is killed, we must unregister from the
waitee so we do not race and get an extra (non-kill) wakeup.
- We need to deal with error propagation correctly in queue_for_group_commit
when one thread is killed.
- Fix one locking issue in queue_for_group_commit(), we could unlock the
waitee lock too early and this end up processing wakeup() with insufficient
locking.
- Fix Xid_log_event::do_apply_event; if commit fails it must not update the
in-memory @@gtid_slave_pos state.
- Fix and cleanup some things in the rpl_parallel.cc error handling.
- Add a missing check for killed in the slave sql driver thread, to avoid a
race.
Improve STOP SLAVE in parallel mode.
Now, the parallel part will queue the current event group to the
end, and then stop queing any more events. Each worker will
complete the current event group, and then just skip any further
queued events.
