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https://issues.apache.org/jira/browse/NIFI-2774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504406#comment-15504406
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ASF GitHub Bot commented on NIFI-2774:
--------------------------------------

Github user olegz commented on the issue:

    https://github.com/apache/nifi/pull/1022
  
    @ckmcd PR comments addressed with few minor improvements.


> ConsumeJMS processor losses messages on NiFi restart
> ----------------------------------------------------
>
>                 Key: NIFI-2774
>                 URL: https://issues.apache.org/jira/browse/NIFI-2774
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>    Affects Versions: 1.0.0, 0.7.0
>            Reporter: Christopher McDermott
>            Assignee: Oleg Zhurakousky
>            Priority: Critical
>             Fix For: 1.1.0, 0.8.0
>
>         Attachments: 2774.patch
>
>
> ConsumeJMS processor uses auto-acknowledge mode.  Unlike the deprecated 
> GetJMSQueue processor it does not provide a way to specify a different ACK 
> mode (i.e. client-acknowledge.)  Using auto-acknowledge, acknowledges message 
> receipt from JMS *before* the messages are actually added to the flow.  This 
> leads to data-loss on NiFi stop (or crash.)
> I believe the fix for this is to allow the user to specify the ACK mode in 
> the processor configuration like is allowed by the GetJMSQueue processor.



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