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

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Handle retry of event groups that span multiple relay log files.

 - If retry reaches the end of one relay log file, move on to the next.

 - Handle refcounting of relay log files, and avoid purging relay log
   files until all event groups have completed that might have needed
   them for transaction retry.
This commit is contained in:
unknown 2014-05-15 15:52:08 +02:00 • committed by Kristian Nielsen
commit 787c470cef
8 changed files with 269 additions and 49 deletions
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21
sql/rpl_rli.h
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@ -170,6 +170,7 @@ public:
*/
inuse_relaylog *inuse_relaylog_list;
inuse_relaylog *last_inuse_relaylog;
my_atomic_rwlock_t inuse_relaylog_atomic_lock;
/*
Needed to deal properly with cur_log getting closed and re-opened with
@ -481,12 +482,26 @@ private:
Each rpl_group_info has a pointer to one of those, corresponding to the
first GTID event.
A reference count keeps track of how long a relay log is potentially in use.
A pair of reference count keeps track of how long a relay log is potentially
in use. When the `completed' flag is set, all events have been read out of
the relay log, but the log might still be needed for retry in worker
threads. As worker threads complete an event group, they increment
atomically the `dequeued_count' with number of events queued. Thus, when
completed is set and dequeued_count equals queued_count, the relay log file
is finally done with and can be purged.
By separating the queued and dequeued count, only the dequeued_count needs
multi-thread synchronisation; the completed flag and queued_count fields
are only accessed by the SQL driver thread and need no synchronisation.
*/
struct inuse_relaylog {
inuse_relaylog *next;
uint64 queued_count;
uint64 dequeued_count;
/* Number of events in this relay log queued for worker threads. */
int64 queued_count;
/* Number of events completed by worker threads. */
volatile int64 dequeued_count;
/* Set when all events have been read from a relaylog. */
bool completed;
char name[FN_REFLEN];
};