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https://issues.apache.org/jira/browse/QPID-6528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14528687#comment-14528687
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ASF subversion and git services commented on QPID-6528:
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Commit 1677842 from [email protected] in branch 'java/trunk'
[ https://svn.apache.org/r1677842 ]
QPID-6528: Always get next available queue entry for the subscription first
even if it is suspended in order to update _lastSeen entry and prevent holding
a reference to an old deleted queue entry
> Multiple starving suspended consumers on a single session might hold the
> reference to old deleted queue entry via QueueContext#_lastSeenEntry causing
> accumulation of deleted queue entries in Broker memory which can eventually
> lead to OOM
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: QPID-6528
> URL: https://issues.apache.org/jira/browse/QPID-6528
> Project: Qpid
> Issue Type: Improvement
> Components: Java Broker
> Affects Versions: 0.22, 0.24, 0.26, 0.28, 0.30, 0.32
> Reporter: Alex Rudyy
> Attachments:
> 0001-QPID-6528-Always-get-next-available-queue-entry-for-.patch
>
>
> Broker might run into OOM due to holding a reference to an old deleted
> QueueEntry in QueueContext#_lastSeenEntry. The issue can occur with multiple
> consumers on a single session with a relatively ow prefetch.
> When session prefetch buffer becomes full, the flow is suspended, and
> subscription states are set to SUSPENDED. The delivery methods on
> AbstractQueue check whether subscription is not suspended(attempDelivery,
> consumerReadyAndJasInterest, processQueue, flushConsumer) before performing
> any delivery activity including _lastSeen update. Thus, message delivery does
> not happen for suspended subscriptions and _lastSeen field in Subscription
> context is not updated. Having many starving consumers on single session
> might cause accumulation of deleted queue entries and OOM
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