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https://issues.apache.org/activemq/browse/AMQ-2401?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin MacNaughton updated AMQ-2401:
-----------------------------------
Attachment: AMQ2401.txt
Path file for Unit Test Reproducing the issue.
> 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
> 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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