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From "Andreas Gies (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2484) Avoid stuck messages in a network of brokers
Date Wed, 11 Nov 2009 09:33:52 GMT
Avoid stuck messages in a network of brokers
--------------------------------------------

                 Key: AMQ-2484
                 URL: https://issues.apache.org/activemq/browse/AMQ-2484
             Project: ActiveMQ
          Issue Type: Improvement
          Components: Broker
         Environment: all
            Reporter: Andreas Gies
            Priority: Minor


In certain fail over scenarios messages can become "stuck" in a network of brokers. This would
be the case if the message was forwarded to a broker because a consumer existed, but the consumer
disconnects or dies before the message can be delivered. Th then the consumer reconnects to
the network of brokers it might be, that it connects to another member of the NWOB alltogether.


If the message has already passed that other broker on its way, the message is stuck. 

To solve this I was thinking along the lines of allowing a NWOB-redelivery policy. The default
for this could be "NONE" and would represent the current behavior. On top of that it would
be nice to configure a timeout, after which the message will be passed on even to nodes that
it has already crossed. Perhaps some kind of backoffmultiplier would make sense here as well
?

Another way might be to simply "forget" the path the message came across, but I am not sure
about the potential impacts regarding duplicate messages or similar issues. 



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