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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AMQ-2877) Failover and prefetch=0 can result in hung consumers if the MessagePull command is lost
Date Wed, 25 Aug 2010 10:19:47 GMT

     [ https://issues.apache.org/activemq/browse/AMQ-2877?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Tully resolved AMQ-2877.
-----------------------------

    Resolution: Fixed

resolve in 988974

having a timeout on the wait for pull may also be sensible, lets see.

> Failover and prefetch=0 can result in hung consumers if the MessagePull command is lost
> ---------------------------------------------------------------------------------------
>
>                 Key: AMQ-2877
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2877
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: JMS client
>    Affects Versions: 5.4.0
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>             Fix For: 5.4.1
>
>
> With prefetch=0,  a consumer that has no messages sends an async message to the broker
to have it dispatch a single message and waits for the dispatch to ocurr. prefetch=0 makes
the consumer a pull consumer, in that it has to ask for a message each time.
> there is a possibility that failover occurs just after the send of the messagePull command
such that the consumer  is blocked waiting for a message but a failover connection or broker
does not know about the outstanding pull command. The connection state tracker is the normal
mechanism for command replay after failover. This needs to be extended to track messagePull
commands, keeping one outstanding reference for each consumer/destination pair that can be
replayed after failover.
> It makes sense to reuse the messageCache for this. 

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