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From Daniel Laügt (Created) (JIRA) <j...@apache.org>
Subject [jira] [Created] (AMQCPP-384) Failover and prefetch=0 can result in hung consumers if the MessagePull command is lost
Date Wed, 09 Nov 2011 14:59:51 GMT
Failover and prefetch=0 can result in hung consumers if the MessagePull command is lost
---------------------------------------------------------------------------------------

                 Key: AMQCPP-384
                 URL: https://issues.apache.org/jira/browse/AMQCPP-384
             Project: ActiveMQ C++ Client
          Issue Type: Bug
            Reporter: Daniel Laügt
            Assignee: Timothy Bish


The problem has been fixed in ActiveMQ Java Client with the issue AMQ-2877:
https://issues.apache.org/jira/browse/AMQ-2877

I've attached a patch that backport the fix done in java to C++. It can be probably used as
suggestion...

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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