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MDEV-5262: Missing retry after temp error in parallel replication

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Start implementing that an event group can be re-tried in parallel replication
if it fails with a temporary error (like deadlock).

Patch is very incomplete, just some very basic retry works.

Stuff still missing (not complete list):

 - Handle moving to the next relay log file, if event group to be retried
   spans multiple relay log files.

 - Handle refcounting of relay log files, to ensure that we do not purge a
   relay log file and then later attempt to re-execute events out of it.

 - Handle description_event_for_exec - we need to save this somehow for the
   possible retry - and use the correct one in case it differs between relay
   logs.

 - Do another retry attempt in case the first retry also fails.

 - Limit the max number of retries.

 - Lots of testing will be needed for the various edge cases.
This commit is contained in:
unknown
2014-05-08 14:20:18 +02:00
committed by Kristian Nielsen
parent 2b4b857d51
commit b0b60f2498
8 changed files with 394 additions and 18 deletions
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6
sql/rpl_parallel.h
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@ -106,11 +106,15 @@ struct rpl_parallel_thread {
queued_size-= dequeue_size;
}
queued_event *get_qev_common(Log_event *ev, ulonglong event_size);
queued_event *get_qev(Log_event *ev, ulonglong event_size,
Relay_log_info *rli);
queued_event *retry_get_qev(Log_event *ev, queued_event *orig_qev,
const char *relay_log_name,
ulonglong event_pos, ulonglong event_size);
void free_qev(queued_event *qev);
rpl_group_info *get_rgi(Relay_log_info *rli, Gtid_log_event *gtid_ev,
rpl_parallel_entry *e);
rpl_parallel_entry *e, ulonglong event_size);
void free_rgi(rpl_group_info *rgi);
group_commit_orderer *get_gco(uint64 wait_count, group_commit_orderer *prev);
void free_gco(group_commit_orderer *gco);