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Date: Thu, 27 May 2010 13:06:52 -0400 (EDT)
From: "Gary Tully (JIRA)" <jira@apache.org>
To: dev@activemq.apache.org
Subject: [jira] Commented: (AMQ-2753) Allow duplicate topic subscriptions in
 a network and use dispatch policy to use highest priority subscriptions
 such that the duplicates are only used for redundancy
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    [ https://issues.apache.org/activemq/browse/AMQ-2753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=59581#action_59581 ] 

Gary Tully commented on AMQ-2753:
---------------------------------

r948911, add priority network consumer dispatch policy that will ignore duplicates such that there can be redundancy in the network with the addition of suppressDuplicateTopicSubscriptions attribute on a network bridge, think this should do it.

{code}PolicyEntry policy = new PolicyEntry();
policy.setDispatchPolicy(new PriorityNetworkDispatchPolicy());{code}

> Allow duplicate topic subscriptions in a network and use dispatch policy to use highest priority subscriptions such that the duplicates are only used for redundancy
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-2753
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2753
>             Project: ActiveMQ
>          Issue Type: Improvement
>          Components: Broker
>    Affects Versions: 5.3.2
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>             Fix For: 5.4.0
>
>
> duplicate topic subscriptions are suppressed in a cyclic network, https://issues.apache.org/activemq/browse/AMQ-2030 but there is a use case where they can be usefull.
> imagine a usecase where we produce on the one broker and consume on other. These two brokers have a cyclic network connection between them. So usually the message is going directly from broker A to broker B, but when that network connector goes down, topic consumer on broker B stops receiving messages. We want to have a "message rerouting", so that in failure case messages start flowing A->C->B route, without a need to re-subscribe. 
> With a cyclic network like this, if we allow the duplicate subscriptions we need to choose among them to suppress duplicates and reduce network load. https://issues.apache.org/activemq/browse/AMQ-2704 added the audit which can help if we don't choose among the duplicates.
> A PriorityNetworkDispatchPolicy can choose to dispatch to the highest priority subscription in the case of duplicate network consumers so that the messages are suppressed at source.

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