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https://issues.apache.org/jira/browse/QPID-3521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Keith Wall resolved QPID-3521.
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Resolution: Fixed
Changes look reasonable to me.
> failover process for the 0-8 client does not clear the pre-dispatch queue
> -------------------------------------------------------------------------
>
> Key: QPID-3521
> URL: https://issues.apache.org/jira/browse/QPID-3521
> Project: Qpid
> Issue Type: Bug
> Components: Java Client
> Reporter: Robbie Gemmell
> Assignee: Alex Rudyy
> Labels: failover
> Fix For: qpid-java-6.0
>
> Attachments: clear-dispatch-queue-on-failover.diff
>
>
> failover process for the 0-8 client does not clear the pre-dispatch queue,
> only the consumer receive queue.
> This is currently masked by an issue with the rollbackMark. The changes made
> in QPID-3546 to fix the 0-10 client path need to be applied to the 0-8/9/9-1
> client path when this issue is resolved.
> We need to clear the pre-dispatch queue on failover. Additionally, we need to
> acquire dispatcher and messageDelivery locks in failover thread in order to
> prevent the dispatcher from dispatching pre-fetched messages whilst failover
> is in progress. If we are not holding the locks, the dispatcher could
> continue dispatching prefetched messages into MessageListener which would
> result in unnecessary JMSExceptions on acknowledge/rollback/commit/recover.
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