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From "Michael Gottschalk (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2191) Incorrect handling of interruptions during commit or rollback of a transaction
Date Wed, 01 Apr 2009 14:19:34 GMT
Incorrect handling of interruptions during commit or rollback of a transaction
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                 Key: AMQ-2191
                 URL: https://issues.apache.org/activemq/browse/AMQ-2191
             Project: ActiveMQ
          Issue Type: Bug
    Affects Versions: 5.3.0
         Environment: Java 1.6.0_02
Kubuntu Linux  2.6.24-22
Bitronix Transaction Manager 1.3.2
            Reporter: Michael Gottschalk


We have a process framework that sends interruptions to threads that should be stopped or
paused. Some of these threads interact with ActiveMQ, so interruptions can occur inside ActiveMQ
at different points.
A problem occurs if the interruption is detected in ActiveMQConnection.syncSendPacket during
commit or rollback of a transaction. ActiveMQ then throws a JMSException so that it occurs
to Bitronix that XA transaction is in an inconsistent state (see stacktrace in the attached
file).

In our opinion, the interruption should be ignored by ActiveMQ during the critical commit
or rollback phase. It is not mandatory that an interruption has an immediate effect. Especially
such a non-interruptable step as rollback or commit should be performed even though an interruption
occurs.

I created a patch for the class TransactionContext which, in case of an interruption, resets
the interruption state of the thread, retries the syncSendPacket method call and restores
the thread's interruption state afterwards. In this manner, no inconsistent state exceptions
occur in the transaction manager any longer and interruption is deferred until the commit/rollback
has succeeded.


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