[jira] [Commented] (AMQ-3576) ProducerBrokerExchange last producer sequenceId initialization needs runtime updates to deal with possible duplicate resends

["Gary Tully (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AMQ-3576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13142549#comment-13142549 ] 

Gary Tully commented on AMQ-3576:
---------------------------------

Solution is to update the producerbrokerexchange sequence on each successful send so that it is aware of duplicates at any point in the message stream.
                
> ProducerBrokerExchange last producer sequenceId initialization needs runtime updates to deal with possible duplicate resends
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-3576
>                 URL: https://issues.apache.org/jira/browse/AMQ-3576
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.5.1
>         Environment: failover:(tcp://host:port?soWriteTimeout=500)?jms.useAsyncSend=true&trackMessages=true
>            Reporter: Gary Tully
>             Fix For: 5.6.0
>
>
> Under load, a  buffered pending send can be replayed along with a failover replay (writeTimeFilter initiated) which can miss the audit b/c it won't have knowledge of the original send.
> The dispatch decision is based on the current stored state at the time of reconnect with the expectation that the next message will not be duplicated. It seems under some load and tcp buffering conditions this is possible to get duplicate sends of new messages.
>  

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