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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AMQ-2030) Topics Delivering Duplicate Messages when have cyclic network of brokers w/multicast discovery
Date Wed, 10 Dec 2008 16:30:07 GMT

     [ https://issues.apache.org/activemq/browse/AMQ-2030?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Tully resolved AMQ-2030.
-----------------------------

    Resolution: Fixed

resolved in 725323. WireFormat now at version 4.

> Topics Delivering Duplicate Messages when have cyclic network of brokers w/multicast
discovery
> ----------------------------------------------------------------------------------------------
>
>                 Key: AMQ-2030
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2030
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.2.0
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>             Fix For: 5.3.0
>
>
> In a cyclic network using m/cast discovery. Every broker knows about ever other broker.
> Network of 3, broker1, broker2, broker2 - consumer on broker2, producer on broker1
> problem description:
> consumer on broker 2 is propagated to broker1 and broker3. 
> Resulting bridged consumer on 1 is propagated to 2 and 3:
>  - broker 2 ignores it because of the broker path match.
>  - broker 3 bridges it and propagates the resulting consumer to 2 and 1. 2 again ignores
as does 1 because of broker path info.. 
> Resulting bridged consumer on 3 is now a duplicate of the subscription propagated to
3 via broker 1. This cannot be suppressed using broker path because 3 only sees the brokerpath
to broker1.
> What is needed is a history of the original consumerId in the bridged subscripton such
that subsequent subscriptions can be seen as duplicates. ConsumerInfo needs to contain a list
of networkConsumerIds.
> To have this propagated needs a wireFormat version increment.
>  

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