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https://issues.apache.org/jira/browse/QPID-5450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13865285#comment-13865285
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Justin Ross commented on QPID-5450:
-----------------------------------
Reviewed by Rob. Approved for 0.26.
> [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, 0.26
> Reporter: Robbie Gemmell
> Assignee: Rob Godfrey
> 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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