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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
parent e7cb032e56
commit 75dc267101
4 changed files with 29 additions and 1 deletions
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3
sql/rpl_parallel.cc
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@@ -44,6 +44,9 @@ rpt_handle_event(rpl_parallel_thread::queued_event *qev,
rgi->event_relay_log_pos= qev->event_relay_log_pos;
rgi->future_event_relay_log_pos= qev->future_event_relay_log_pos;
strcpy(rgi->future_event_master_log_name, qev->future_event_master_log_name);
if (!(ev->is_artificial_event() || ev->is_relay_log_event() ||
(ev->when == 0)))
rgi->last_master_timestamp= ev->when + (time_t)ev->exec_time;
mysql_mutex_lock(&rli->data_lock);
/* Mutex will be released in apply_event_and_update_pos(). */
err= apply_event_and_update_pos(ev, thd, rgi, rpt);