[jboss-jira] [JBoss JIRA] Commented: (JBMESSAGING-1149) Singleton consumer on queue/topic

[Tim Fox (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBMESSAGING-1149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12440245#action_12440245 ] 

Tim Fox commented on JBMESSAGING-1149:
--------------------------------------

For JBM 2.0 this is a bit different.

The real requirement here can be solved by cluster wide message grouping.

With message groups, if you specify the message group group header, then all messages with that same value of that header will be processed by the same consumer - this effectively gives you a singleton consumer.

Normal message grouping only works on one node only, but we can extend it to always route a message to the same consumer on a particular node irrespective of where the message was sent from.

This can be done by setting up a message flow, which routes the message to a node based on a hash of the message group header. Each node will evaluate the hash the same, so all will send it to the same node. Once arrived on that node normal message grouping will occur.

> Singleton consumer on queue/topic
> ---------------------------------
>
>                 Key: JBMESSAGING-1149
>                 URL: https://jira.jboss.org/jira/browse/JBMESSAGING-1149
>             Project: JBoss Messaging
>          Issue Type: Task
>    Affects Versions: 1.4.0.SP1
>            Reporter: Tim Fox
>            Assignee: Tim Fox
>             Fix For: 2.0.0 Beta
>
>
> A last minute requirement came up from the AS team (Carlo and Bill DeCoste).
> JBoss MQ uses HA singleton to provide a singleton consumer on a queue/topic. If that node fails, the consumer should failover onto another single node.
> Currently this isn't supported in JBM.

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