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https://issues.apache.org/jira/browse/QPID-5450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13863741#comment-13863741
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ASF subversion and git services commented on QPID-5450:
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Commit 1556096 from [~gemmellr] in branch 'qpid/trunk'
[ https://svn.apache.org/r1556096 ]
QPID-5450: have the group manager try to acquire the message at the time it is
accepted into the group, so that the associated shared-group state change
occurs within the single synchronization block
> [Java Broker] shared message group race between acquiring new messages and
> acking delivered messages can lead to concurrent delivery
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: QPID-5450
> URL: https://issues.apache.org/jira/browse/QPID-5450
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.22, 0.24
> Reporter: Robbie Gemmell
> Assignee: Robbie Gemmell
> Fix For: 0.27
>
>
> When using shared message groups, there is a synchronization issue leading to
> a race between acquiring new messages that are being added to the group
> causing a state change within the group, and acking of the last message in
> the group, which can lead to concurrent delivery of messages for the group.
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