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https://issues.apache.org/jira/browse/AMQ-3826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267401#comment-13267401
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Bhanu commented on AMQ-3826:
----------------------------

We are not using any transactions either !
                
> Lot of unmatched ackowledge warnings
> ------------------------------------
>
>                 Key: AMQ-3826
>                 URL: https://issues.apache.org/jira/browse/AMQ-3826
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.5.1
>            Reporter: Bhanu
>
> Hello,
> We are getting a lot of these kind of exceptions in broker logs.
> activemq.log.2012-02-29:2012-02-29 19:10:32,872 | WARN  | Async error 
> occurred: javax.jms.JMSException: Unmatched acknowledge: MessageAck 
> {commandId = 80173, responseRequired = false, ackType = 2, consumerId = 
> ID:desa1186.nyc.deshaw.com-61574-1329905029635-2:3:60:1, firstMessageId = 
> null, lastMessageId = 
> ID:desb0444.nyc.deshaw.com-49820-1330523262004-0:618:2:1:1, destination = 
> queue://tca.heartbeat, transactionId = null, messageCount = 1, poisonCause = 
> null}; Expected message count (1) differs from count in dispatched-list (2) | 
> org.apache.activemq.broker.TransportConnection.Service | ActiveMQ Transport: 
> tcp:///10.253.127.196:46192
> I did some googling and found that these can occur while using 
> failover(either by failover API or failover broker). But we are not using any 
> failover in the setup where these exceptions are occuring. I am not able to 
> reproduce them either. They occur during the day randomly.
> Any ideas on why they are being logged?
> Thanks,
> Bhanu

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