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From "Martin Ritchie (JIRA)" <qpid-...@incubator.apache.org>
Subject [jira] Resolved: (QPID-69) Race condition in Delivery Manager
Date Tue, 07 Nov 2006 11:08:53 GMT
     [ http://issues.apache.org/jira/browse/QPID-69?page=all ]

Martin Ritchie resolved QPID-69.
--------------------------------

    Resolution: Fixed

SVN Rev: 472060
Checked two DeliveryManagers one using synchronisation one using a concurrent access queue.
Both should solve the race condition. The Concurrent access queue can be configured not to
record the queue size. This should increase performance for installations that need the throughput.
Testing needs to be done to measure the actuall performance benefits between these versions.

> Race condition in Delivery Manager
> ----------------------------------
>
>                 Key: QPID-69
>                 URL: http://issues.apache.org/jira/browse/QPID-69
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Broker
>    Affects Versions: M1
>            Reporter: Martin Ritchie
>         Assigned To: Martin Ritchie
>             Fix For: M1
>
>
> The delivery manager has a race condition where messages could be added to the message
queue while a channel is suspended. Only to have the channel unsuspend and purge the queue
before the new message makes it on to the queue. This then causes all further messages to
be queue but as the channel has now been unsuspended there is now way to kick off the asynchronous
delivery process.

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