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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (AMQ-3985) ActiveMQConnection temp advisory consumer should use asyncDispatch - can cause deadlock with slow consumers
Date Tue, 21 Aug 2012 15:49:38 GMT

     [ https://issues.apache.org/jira/browse/AMQ-3985?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Tully resolved AMQ-3985.
-----------------------------

    Resolution: Fixed
      Assignee: Gary Tully

fix in http://svn.apache.org/viewvc?rev=1375595&view=rev
                
> ActiveMQConnection temp advisory consumer should use asyncDispatch - can cause deadlock
with slow consumers
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-3985
>                 URL: https://issues.apache.org/jira/browse/AMQ-3985
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: JMS client
>    Affects Versions: 5.6.0
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>              Labels: advisory, consumer, deadlock, slow, temp
>             Fix For: 5.7.0
>
>
> A slow or blocked connection with the default temp advisory consumer can cause operations
that create advisories to block b/c the dispatch is sync to that advisory consumer. If the
block occurs after the prefetch is filled the broker stores pending messages and the problem
is avoided, but if the block occurs before the prefetch is reached, the dispatch is attempted
in the calling thread, which blocks the originating operation. not good.
> The solution is to always request async dispatch for the temp advisory consumer in a
client connection.

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