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From "Alex Rudyy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-3521) failover process for the 0-8 client does not clear the pre-dispatch queue
Date Thu, 06 Aug 2015 11:07:04 GMT

    [ https://issues.apache.org/jira/browse/QPID-3521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14659832#comment-14659832
] 

Alex Rudyy commented on QPID-3521:
----------------------------------

Keith,
We updated the JIRA description about the rationale to acquire dispatcher/messageDelivery
locks in failover thread.
Regarding, your comment about sorting out draining queue functionality. Yes, it make sense
to move it into the corresponding subclasses

> 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
>         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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