[jboss-jira] [JBoss JIRA] Updated: (JBMESSAGING-809) Extra message created if server fails right after send is completed

[Clebert Suconic (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBMESSAGING-809?page=all ]

Clebert Suconic updated JBMESSAGING-809:
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    Description: 
Imagine two threads... producer/consumer...

If the server crashed after the message was sent, when the client fails over to a new server it will try to send or ack the message again, even if it was ACKED before.

There is also a possibility of the consumer ACK synchronized.. For this case you have the related issue JBMESSAGING-815

  was:
Imagine two threads... producer/consumer...

If the server crashes when both ACK and send are still coming back from the execution (at the same time)... there is a chance of creating a message.

I have created MultiThreadFailoverTest::testFailureOnSendReceiveSynchronized for this... But I have seen testMultiThreadFailover failing ocasionally.

testFailureOnSendReceiveSynchronized poisons the server is a special way to cause the synchronization issue in a predictable way.


> Extra message created if server fails right after send is completed
> -------------------------------------------------------------------
>
>                 Key: JBMESSAGING-809
>                 URL: http://jira.jboss.com/jira/browse/JBMESSAGING-809
>             Project: JBoss Messaging
>          Issue Type: Bug
>    Affects Versions: 1.2.0.Beta2
>            Reporter: Clebert Suconic
>         Assigned To: Clebert Suconic
>            Priority: Critical
>             Fix For: 1.2.0.CR1
>
>
> Imagine two threads... producer/consumer...
> If the server crashed after the message was sent, when the client fails over to a new server it will try to send or ack the message again, even if it was ACKED before.
> There is also a possibility of the consumer ACK synchronized.. For this case you have the related issue JBMESSAGING-815

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