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https://issues.apache.org/jira/browse/QPID-3980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13271401#comment-13271401
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Rob Godfrey commented on QPID-3980:
-----------------------------------
Change looks good to me
> Last value queue - entries replaced by conflation are never deleted, causing
> memory leak
> ----------------------------------------------------------------------------------------
>
> Key: QPID-3980
> URL: https://issues.apache.org/jira/browse/QPID-3980
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.16
> Reporter: Philip Harvey
> Attachments: send-lvq-messages-without-a-consumer.json
>
>
> This issue was uncovered while investigating QPID-3979.
> The conflation behaviour of last value queues appears correct from the
> perspective of consumers. However, the message count suggests that conflation
> is *not* occurring.
> I checked what happens when ConflationQueueList.add(..) is replacing an
> existing ConflationQueueEntry. ConflationQueueList calls acquire() on the
> entry and then tries to discard it. The discard does nothing because it tries
> again to acquire the message. Therefore, the message stays in the list,
> causing a memory leak.
> Because the message has been acquired, it is not delivered to consumers -
> that is why everything appears to work correctly from their point of view.
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