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