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https://issues.apache.org/activemq/browse/AMQ-2294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=52326#action_52326
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Bruce Snyder commented on AMQ-2294:
-----------------------------------
You indicated that you're using the default configuration which limits the size
of all queues and topics to 5mb and, by default in ActiveMQ, [producer flow
control|http://activemq.apache.org/producer-flow-control.html] is enabled. So
either the destination to which you're sending has filled up or the has flow
control kicked in and paused the producers. Chances are this is the producer
flow control.
> MessageProducer hangs when using many concurrent sessions
> ---------------------------------------------------------
>
> Key: AMQ-2294
> URL: https://issues.apache.org/activemq/browse/AMQ-2294
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker, JMS client
> Affects Versions: 5.2.0
> Environment: I am using the default activemq.xml config. tested and
> reproduced on both windows and linux machines
> Reporter: Puneet Gupta
> Attachments: Producer_ThreadDump.txt, ServerDebugLog_ThreadDump.txt
>
>
> If you create a client (producer) that creates 25 non-transacted sessions and
> concurrently starts sending messages. The producer will hang after sending
> exactly 2560 1K messages.
> This behavior is very easily reproducible.
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