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From "Lionel Cons (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (APLO-280) Clarification about message groups
Date Tue, 29 Jan 2013 09:45:27 GMT

    [ https://issues.apache.org/jira/browse/APLO-280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13565224#comment-13565224
] 

Lionel Cons commented on APLO-280:
----------------------------------

This phrasing is indeed much clearer.

As a consequence, it is now obvious that, when acks are not used, the assigned consumer can
change at any point in time...
                
> 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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