wsrep commit callback does not release mdl locks

[Teemu Ollakka]

Running statements

  create table foo (a int);
  insert into foo values (1);
  truncate foo;

on one node make slaves to log MDL conflicts

131028 7:01:23 [Note] WSREP: MDL conflict
request: (5 seqno 214 wsrep (1, 1, 0) cmd 0 8 truncate foo)
granted: (3 seqno 213 wsrep (1, 0, 0) cmd 0 133 (null))
131028 7:01:23 [Note] WSREP: MDL ticket: type: shared write space: TABLE db: test name: foo
131028 7:01:23 [Note] WSREP: MDL BF-BF conflict
request: (5 seqno 214 wsrep (1, 1, 0) cmd 0 8 truncate foo)
granted: (3 seqno 213 wsrep (1, 0, 0) cmd 0 133 (null))
131028 7:01:23 [Note] WSREP: MDL ticket: type: shared write space: TABLE db: test name: foo

This indicates that MDL locks are not released properly on slaves at commit time.

5.5 and 5.6 only.

[Teemu Ollakka (teemu-ollakka)]

Fixes pushed:
5.5 http://bazaar.launchpad.net/~codership/codership-mysql/wsrep-5.5/revision/3910
5.6 http://bazaar.launchpad.net/~codership/codership-mysql/5.6/revision/3990

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PXC-1495