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https://issues.apache.org/activemq/browse/AMQ-2572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary Tully resolved AMQ-2572.
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Resolution: Fixed
resolved in r900317
> Timing issue on consumer close can lead to unconsumed messages being
> inadvertently marked as duplicates and not getting delivered
> -----------------------------------------------------------------------------------------------------------------------------------
>
> Key: AMQ-2572
> URL: https://issues.apache.org/activemq/browse/AMQ-2572
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.3.0
> Reporter: Gary Tully
> Assignee: Gary Tully
> Fix For: 5.3.1, 5.4.0
>
>
> Intermittent failure of
> activemq-core/src/test/java/org/apache/activemq/bugs/AMQ2102Test.java on
> Linux. Tracking this failure down, the problem of the hung test was missing
> messages, part of the prefetch that were delivered while the consumer was
> closing. A timing issue between the audit rollback of unconsumed messages
> and the delivery of messages meant that some messages were not rolledback on
> close.
> The use case has consumers that connect, consume a batch of 10 messages in
> individual transactions and close. These operations complete before the
> prefetch(1000) messages haven been delivered so there was concurrent delivery
> and closure happing which sometimes resulted in the problem.
> The fix is to ensure the consumer is removed from the session and closed
> prior to doing the audit rollback on unconsumed messages.
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