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From "Kenny MacLeod (JIRA)" <>
Subject [jira] Created: (AMQ-1313) DefaultDatabaseLocker broken on MySQL 4.1
Date Thu, 05 Jul 2007 11:15:33 GMT
DefaultDatabaseLocker broken on MySQL 4.1

                 Key: AMQ-1313
             Project: ActiveMQ
          Issue Type: Bug
          Components: Message Store
    Affects Versions: 4.1.1
            Reporter: Kenny MacLeod
            Priority: Critical

AMQ-992 introduced a change in 4.1.1 where the DefaultDatabaseLocker issued a LOCK TABLE command
instead of a SELECT FOR UPDATE.

This may work with MySQL 5 ( I haven't had the chance to test that yet), but it certainly
doesn't work with MySQL 4.1.  The "LOCK TABLE" statement does not return a result set in 4.1,
so the execute() method returns false, and the locking loop never terminates.

Given that AMQ-992 was unnecessary (see comments there for the reason why), I suggest that
the change is rolled back to using SELECT FOR UPDATE.

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