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Change Seconds_behind_master to be updated only at commit in parallel replication

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Before, the Seconds_behind_master was updated already when an event
was queued for a worker thread to execute later. This might lead users
to interpret a low value as the slave being almost up to date with the
master, while in reality there might still be lots and lots of events
still queued up waiting to be applied by the slave.

See https://lists.launchpad.net/maria-developers/msg08958.html for
more detailed discussions.
This commit is contained in:
Kristian Nielsen 2015-10-22 10:28:51 +02:00
commit 75dc267101
4 changed files with 29 additions and 1 deletions
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7
sql/rpl_rli.h
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@ -668,6 +668,13 @@ struct rpl_group_info
/* Needs room for "Gtid D-S-N\x00". */
char gtid_info_buf[5+10+1+10+1+20+1];
/*
The timestamp, from the master, of the commit event.
Used to do delayed update of rli->last_master_timestamp, for getting
reasonable values out of Seconds_Behind_Master in SHOW SLAVE STATUS.
*/
time_t last_master_timestamp;
/*
Information to be able to re-try an event group in case of a deadlock or
other temporary error.