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https://issues.apache.org/jira/browse/AMQ-2864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14188368#comment-14188368
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Annamalai commented on AMQ-2864:
--------------------------------

Thank you Gary. That's what I would expect. So with concurrent store and 
dispatch on a virtual topic with persistent messages(multiple subscriber 
queues) , 
1. Does the producer gets released as soon as the message is published and 
broker gets a single copy of the message?
OR
2. Does the producer gets released, when the messages gets copied from VT to 
multiple subscriber queues and the consumers on the subscriber queues acks them.
3. Whats the risk of loosing messages on a VT with concurrent store and 
dispatch enabled.

> AMQ2149KahaDBTest - intermittent missing/out of order message with 
> restart/failover and durable subs
> ----------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-2864
>                 URL: https://issues.apache.org/jira/browse/AMQ-2864
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.4.0
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>             Fix For: 5.4.1
>
>
> intermittent failure, activate of a durable sub and additions to the topic 
> store may need a sync or async store and dispatch topics may need to be 
> disabled.



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