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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2691) Durable Subscriptions have messages replayed (duplicate messages) after network broker restart
Date Fri, 09 Apr 2010 10:33:08 GMT
Durable Subscriptions have messages replayed (duplicate messages) after network broker restart
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                 Key: AMQ-2691
                 URL: https://issues.apache.org/activemq/browse/AMQ-2691
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.3.1, 5.3.0
            Reporter: Gary Tully
            Assignee: Gary Tully


Durable subs in a network of brokers can experience duplicate deliveries when a broker restarts.

The problem lies in duplicate suppression and missing durable acks. Give two brokers, each
networked together and with a durable consumer on each. A message produced to One gets delivered
locally and forwarded to the other broker where it gets delivered. The redelivery back to
the originator is suppressed by a filter that sees the broker path bread crumb. However this
suppressed message is not acked so the broker on restart sees an outstanding durable message
for the networked broker and recovers the topic subscription, delivering duplicates.

differences in the store implementation, a store per durable sub or a shared sub store mean
the issue surfaces differently.


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