We have a MariaDB server that sometimes seems to get an indefinite table lock. The only way to solve it is to kill MariaDB and restart it. It "randomly happens", so I suspect it may be a race condition. The replication thread get's stuck in state "After opening tables". The lock seems to be caused by a query on an unrelated database with 3 million MyISAM tables (not receiving data via replication) in state "Opening tables". These databases are completely separated, so they shouldn't cause a lock between each other.
Processlist shows:
root@server ~ # mysql -e "show full processlist"
|
+----------+----------------------+-----------------------+----------------------+---------+---------+----------------------------------+-------------------------------------------------------+----------+
|
| Id | User | Host | db | Command | Time | State | Info | Progress |
|
+----------+----------------------+-----------------------+----------------------+---------+---------+----------------------------------+-------------------------------------------------------+----------+
|
| 2 | system user | | NULL | Connect | 1116538 | Waiting for master to send event | NULL | 0.000 |
|
| 3 | system user | | replication_database | Connect | 264121 | After opening tables | COMMIT | 0.000 |
|
| 37332419 | user1 | localhost | large_database | Killed | 264121 | Opening tables | DELETE FROM `my_domain` WHERE date<'2016-04-29' | 0.000 |
|
| 48692447 | root | localhost | NULL | Query | 0 | init | show full processlist | 0.000 |
|
+----------+----------------------+-----------------------+----------------------+---------+---------+----------------------------------+-------------------------------------------------------+----------+
|
root@server ~ #
|
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Bug
Major