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From "David Jencks (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQ-1632) PrefetchSubscription may not wake up if messages delivered in transaction
Date Mon, 24 Mar 2008 07:24:34 GMT

    [ https://issues.apache.org/activemq/browse/AMQ-1632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=41760#action_41760
] 

David Jencks commented on AMQ-1632:
-----------------------------------

Fixed in rev 640336, branches 4.1.  The actual fix is in   activemq-core/src/main/java/org/apache/activemq/broker/region/PrefetchSubscription.java,
other files contain thread-safety improvements.  Leaving open till I can check trunk for similar
problems.

> PrefetchSubscription may not wake up if messages delivered in transaction
> -------------------------------------------------------------------------
>
>                 Key: AMQ-1632
>                 URL: https://issues.apache.org/activemq/browse/AMQ-1632
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 4.1.1
>            Reporter: David Jencks
>            Assignee: David Jencks
>             Fix For: 4.1.2
>
>
> we noticed mdbs w/transaction on don't work if the prefetch size is less than the number
of sessions for the mdb.  There's an error in calculating the prefetchExtension in afterCommit
and there's no notification that it might be time to send more messages.  Apparently if the
prefetch size is large enough one of the earlier acks triggers delivery of the next batch.
> There are also a bunch of synchronization errors in some classes...

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