[jboss-jira] [JBoss JIRA] Updated: (JBMESSAGING-565) Race Condition between Topic/Queue.getMessageCount and Deliver Thread

[Clebert Suconic (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBMESSAGING-565?page=all ]

Clebert Suconic updated JBMESSAGING-565:
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    JBoss Forum Reference: http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3975072#3975072

> Race Condition between Topic/Queue.getMessageCount and Deliver Thread
> ---------------------------------------------------------------------
>
>                 Key: JBMESSAGING-565
>                 URL: http://jira.jboss.com/jira/browse/JBMESSAGING-565
>             Project: JBoss Messaging
>          Issue Type: Bug
>    Affects Versions: 1.2.0.Alpha1
>            Reporter: Clebert Suconic
>         Assigned To: Clebert Suconic
>             Fix For: 1.2.0.Alpha2
>
>
> This is not necessarily a bug. It' s more a task, but I will assume it as a bug at this point.
> QueueManagementTest::testMessageCountOverFullSize has a race condition between getMessageCount and Deliver Thread.
> PagingChannelSupport::messageCount is an arithmethic expressions of messageRefs.size() + deliveries.size() + nextPagingOrder -  firstPagingOrder
> deliveries.size is being controlled by Delivery Thread, determined by DeliveryRunnable that runs as-synchronously on Destination.
> While getMessageCount might diverge momentarily it will eventually be fixed as soon as DeliveryRunnable has the appropriate time to send the result to the collection deliveries.
> To fix this we would need to synchronize delivery and messageCount somehow, probably adding global lock, what we don' t want to add I assume. So, if this is correct the test has to be fixed somehow.
> I have changed the test in such way it will make easier to identify the racing condition. Use tracing in your tests and you will see a retry routine that will eventually pass. 

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