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MDEV-7145: Delayed replication

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Merge feature into 10.2 from feature branch.

Delayed replication adds an option

  CHANGE MASTER TO master_delay=<seconds>

Replication will then delay applying events with that many
seconds. This creates a replication slave that reflects the state of
the master some time in the past.

Feature is ported from MySQL source tree.

Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>
This commit is contained in:
Kristian Nielsen
2016-10-16 23:44:44 +02:00
parent 057c560ee4 fb13616518
commit e1ef99c3dc
31 changed files with 1677 additions and 321 deletions
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17
sql/rpl_parallel.cc
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@ -47,9 +47,7 @@ rpt_handle_event(rpl_parallel_thread::queued_event *qev,
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);
err= apply_event_and_update_pos_for_parallel(ev, thd, rgi);
thread_safe_increment64(&rli->executed_entries);
/* ToDo: error handling. */
@ -2426,8 +2424,17 @@ rpl_parallel::do_event(rpl_group_info *serial_rgi, Log_event *ev,
!(unlikely(rli->gtid_skip_flag != GTID_SKIP_NOT) && is_group_event))
return -1;
/* ToDo: what to do with this lock?!? */
mysql_mutex_unlock(&rli->data_lock);
/* Note: rli->data_lock is released by sql_delay_event(). */
if (sql_delay_event(ev, rli->sql_driver_thd, serial_rgi))
{
/*
If sql_delay_event() returns non-zero, it means that the wait timed out
due to slave stop. We should not queue the event in this case, it must
not be applied yet.
*/
delete ev;
return 1;
}
if (unlikely(typ == FORMAT_DESCRIPTION_EVENT))
{