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From "Timothy Bish (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-3948) Multiple consumers retrieving same message from ActiveMQ
Date Fri, 27 Jul 2012 13:27:35 GMT

    [ https://issues.apache.org/jira/browse/AMQ-3948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423860#comment-13423860
] 

Timothy Bish commented on AMQ-3948:
-----------------------------------

Messages can be redelivered if your client fails to ACK them.  Can you provide a unit test
that shows your issue?  Since you are on an old release its a good idea to give the latest
release a try as well to see if your issue has been addressed. 
                
> 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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