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MDEV-23328 Server hang due to Galera lock conflict resolution

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adaptation of 29bbcac0ee for 10.4
This commit is contained in:
Sergei Golubchik
2021-02-07 17:48:58 +01:00
parent 9703cffa8c
commit eac8341df4
11 changed files with 185 additions and 102 deletions
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11
sql/sql_class.cc
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@ -799,6 +799,7 @@ THD::THD(my_thread_id id, bool is_wsrep_applier)
mysql_mutex_init(key_LOCK_wakeup_ready, &LOCK_wakeup_ready, MY_MUTEX_INIT_FAST);
mysql_mutex_init(key_LOCK_thd_kill, &LOCK_thd_kill, MY_MUTEX_INIT_FAST);
mysql_cond_init(key_COND_wakeup_ready, &COND_wakeup_ready, 0);
mysql_mutex_record_order(&LOCK_thd_kill, &LOCK_thd_data);
/* Variables with default values */
proc_info="login";
@ -5058,11 +5059,13 @@ thd_need_ordering_with(const MYSQL_THD thd, const MYSQL_THD other_thd)
#ifdef WITH_WSREP
/* wsrep applier, replayer and TOI processing threads are ordered
by replication provider, relaxed GAP locking protocol can be used
between high priority wsrep threads
between high priority wsrep threads.
Note that wsrep_thd_is_BF() doesn't take LOCK_thd_data for either thd,
the caller should guarantee that the BF state won't change.
(e.g. InnoDB does it by keeping lock_sys.mutex locked)
*/
if (WSREP_ON &&
wsrep_thd_is_BF(const_cast<THD *>(thd), false) &&
wsrep_thd_is_BF(const_cast<THD *>(other_thd), true))
if (WSREP_ON && wsrep_thd_is_BF(thd, false) &&
wsrep_thd_is_BF(other_thd, false))
return 0;
#endif /* WITH_WSREP */
rgi= thd->rgi_slave;