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https://issues.apache.org/jira/browse/QPID-4287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13804613#comment-13804613
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Alan Conway commented on QPID-4287:
-----------------------------------
There was a new but similar bug in the trunk code, will post a fix shortly:
https://reviews.apache.org/r/14911/
> Poor performance when a priority queue with a ring queue policy has a large
> backlog
> -----------------------------------------------------------------------------------
>
> Key: QPID-4287
> URL: https://issues.apache.org/jira/browse/QPID-4287
> Project: Qpid
> Issue Type: Bug
> Components: C++ Broker
> Affects Versions: 0.18
> Reporter: Jason Dillaman
> Assignee: Alan Conway
> Attachments: qpid-4287.patch
>
>
> The ring queue policy utilizes a single deque to store messages in priority
> and FIFO order. When inserting messages of mixed priority into a queue with
> a large (>100,000) message backlog, the performance degrades quickly enough
> to potentially block all broker worker threads if they all are publishing to
> the same queue. Recommend separating the ring queue data structure into
> separate deques based upon message priority in order to avoid the potential
> for reshuffling the deque with each incoming message.
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