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From "Colin MacNaughton (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2401) Hangs in fan-in to DUPS_OK_ACKNOWLEDGE queue receivers
Date Mon, 21 Sep 2009 19:59:51 GMT
Hangs in fan-in to DUPS_OK_ACKNOWLEDGE queue receivers
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                 Key: AMQ-2401
                 URL: https://issues.apache.org/activemq/browse/AMQ-2401
             Project: ActiveMQ
          Issue Type: Bug
    Affects Versions: 5.3.0
         Environment: N/A
            Reporter: Colin MacNaughton


While running performance tests I I was seeing hangs in several tests  involving dups ok queue
receivers. My suspicion is that this is related to "too lazy" dups_ok acknowledgements. Changing
the queue prefetchLimit to 100 caused this problem to go away. This needs more investigation,
but it seems like we can get ourselves in to trouble if the queue size is smaller than the
receiver's prefetchLimit, and this should be avoid. It is also possible that there is something
more complicated happening in my tests. I haven't yet been able to reproduce this outside
my performance test environment. 


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