[jboss-jira] [JBoss JIRA] Commented: (JBMESSAGING-815) Extra message created if server fails when send and ACK are synchronized

[Tim Fox (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBMESSAGING-815?page=comments#action_12367254 ] 
            
Tim Fox commented on JBMESSAGING-815:
-------------------------------------

To explain this issue in more detail:

If message or ack is sent and hits the server and is processed correctly, then the server fails before the response is written back to the client, the client will get an exception and failover will start.

When the client has failed over it will retry sending the message or ack.

For the ack this is harmless since we can just ignore acks received if we can't find the message - the assumption here is it is already acked.

For sends this is more serious. The message might have been previously sent and acked, so we might not find it in the queue.

To solve this properly we need duplicate message detection on the server.

Duplicate message detection is currently scheduled for 2.0

> Extra message created if server fails when send and ACK are synchronized
> ------------------------------------------------------------------------
>
>                 Key: JBMESSAGING-815
>                 URL: http://jira.jboss.com/jira/browse/JBMESSAGING-815
>             Project: JBoss Messaging
>          Issue Type: Bug
>    Affects Versions: 1.0.1.SP3
>            Reporter: Clebert Suconic
>         Assigned To: Clebert Suconic
>            Priority: Critical
>             Fix For: 2.0.0 Beta 1
>
>
> MultiThreadFailoverTest::testFailureOnSendReceiveSynchronized fails for this bug
> This test poisons the server to wait consumer and sender to be in a same point before crashing it.

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