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From "Timothy Bish (JIRA)" <>
Subject [jira] [Commented] (AMQ-4231) RWLock in queue does not used properly - performance improvement
Date Tue, 18 Dec 2012 18:46:12 GMT


Timothy Bish commented on AMQ-4231:

Patch is lacking any unit tests which would prevent the fixes from being protected into the
future plus serve as a demonstration of the possible problem.
> RWLock in queue does not used properly - performance improvement
> ----------------------------------------------------------------
>                 Key: AMQ-4231
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Improvement
>          Components: Broker
>    Affects Versions: 5.4.2, 5.7.0
>         Environment: fedora15; ubuntu 12.10; debian; probably independent
>            Reporter: Tomáš Martinec
>            Priority: Minor
>              Labels: locks, performance,, queue,, synchronization,
>         Attachments: unsynchronizing-cursors.diff
> The full story is in the user forum under title:
> Activemq 5.4.2 hangs when the temp disk usage is used
> The advantage of RW locks in Queue class is not used much. The cursors objects are synchronized,
so the readers cannot access the queued messages concurrently.
> The fixing effort of this issue may not be worth it, but you may consider this issue
during fixing related issues.

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