Jason Dillaman created QPID-4287:
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             Summary: 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


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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