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https://issues.apache.org/jira/browse/AMQ-3948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424872#comment-13424872
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Joe Roberts commented on AMQ-3948:
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I have tried using ActiveMQ 5.6 and the same issue is seen there. This
typically happens when multiple consumers attempt to retrieve a message at the
same time. Our consumers spit out logs and the logged messages occur within the
same second. If the timing is outside of that, this issue is not seen and
messages are retrieved normally. If our client was failing to do something, I
would expect this redelivery to occur all the time. The timing on this also
makes it difficult to lock down in a unit test, though we can try. Would our
logs or the activemq logs be helpful here?
> Multiple consumers retrieving same message from ActiveMQ
> --------------------------------------------------------
>
> Key: AMQ-3948
> URL: https://issues.apache.org/jira/browse/AMQ-3948
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.4.3
> Environment: ActiveMQ 5.4.3 running on 64-bit Windows 7 OS. 64-bit
> JDK.
> Reporter: Joe Roberts
> Fix For: NEEDS_REVIEWED
>
> Attachments: applicationContext-mcp-parallelization-activemq.xml
>
>
> We have a java web-service (running in Jetty) that dynamically instantiates
> an ActiveMQ queue and send messages to the queue - the messages are integers
> (i.e. 1, 2, 3, etc). We have from one to many consumers that read from this
> queue to process these messages. Each consumer is started from a single
> process but each consumer is running in it's own thread or process. When we
> have multiple consumers running, they occasionally will pick up the same
> integer or message from the queue. This is not desired. If a consumer reads a
> message, we don't want other consumers to retrieve that same message. We're
> fairly new to ActiveMQ but those we're telling about this issue said it
> should not be happening. They think it might be that we have an ActiveMQ
> configuration issue. Could be we need to set a property to prevent this. Just
> looking for some help. I've attached our
> applicationContext-mcp-parallelization-activemq XML. We could have configured
> this incorrectly. We're using the internalAmqConnectionFactory for this queue.
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