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From "Hiram Chirino (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (APLO-280) Clarification about message groups
Date Mon, 28 Jan 2013 19:13:13 GMT

    [ https://issues.apache.org/jira/browse/APLO-280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13564556#comment-13564556
] 

Hiram Chirino commented on APLO-280:
------------------------------------

I've changed the documentation so that it reads as:

"all messages for the same message group will be sent to the currently assigned consumer for
the group.  The assigned consumer consumer for a message group may change but not before all
messages sent to the previous consumer are acked or if the consumer is disconnected."
                
> Clarification about message groups
> ----------------------------------
>
>                 Key: APLO-280
>                 URL: https://issues.apache.org/jira/browse/APLO-280
>             Project: ActiveMQ Apollo
>          Issue Type: Improvement
>            Reporter: Lionel Cons
>
> First, there is a typo in the added doc as it contains "When you another subscription
to a queue".
> Then, it seems there is a contradiction between "ensures that all messages for the same
message group will be sent to the same consumer" and "the broker rebalances the message groups
across consumers".
> Apollo has no way to know if new messages for an already seen message group will continue
to come or not. So, by rebalancing, it may cause new messages of the same group to go to another
consumer.
> IMHO, rebalancing can only happen safely when old consumers stop and only for their "attached"
message groups.

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