[jira] Resolved: (AMQ-2401) Hangs in fan-in to DUPS_OK_ACKNOWLEDGE queue receivers

["Hiram Chirino (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/activemq/browse/AMQ-2401?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hiram Chirino resolved AMQ-2401.
--------------------------------

       Resolution: Fixed
    Fix Version/s: 5.3.0

I added the test case to the build.. slightly modified so that it would exacerbate the DUPS_OK problem to get a quicker failure.
rev: 818496
The fix for the test case went in as rev: 818487

> Hangs in fan-in to DUPS_OK_ACKNOWLEDGE queue receivers
> ------------------------------------------------------
>
>                 Key: AMQ-2401
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2401
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.3.0
>         Environment: Running with the following config:
> <destinationPolicy>
>  <policyMap>
>    <policyEntries>
>      <policyEntry topic=">" producerFlowControl="true" memoryLimit="1mb">                      
>        <pendingSubscriberPolicy>
>          <vmCursor/>
>        </pendingSubscriberPolicy>
>      </policyEntry>
>      <policyEntry queue=">" producerFlowControl="true" memoryLimit="1mb"/>
>    </policyEntries>
>  </policyMap>
> </destinationPolicy>
>            Reporter: Colin MacNaughton
>             Fix For: 5.3.0
>
>         Attachments: AMQ-2401.patch, AMQ2401.txt
>
>
> 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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