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From "Hiram Chirino (JIRA)" <>
Subject [jira] Commented: (AMQ-2401) Hangs in fan-in to DUPS_OK_ACKNOWLEDGE queue receivers
Date Wed, 23 Sep 2009 19:45:52 GMT


Hiram Chirino commented on AMQ-2401:

I think the safest bet will be to change the client so that he acks more frequently at least
in a queue dups ok case.

> Hangs in fan-in to DUPS_OK_ACKNOWLEDGE queue receivers
> ------------------------------------------------------
>                 Key: AMQ-2401
>                 URL:
>             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
>         Attachments: 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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