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From "Lionel Cons (JIRA)" <j...@apache.org>
Subject [jira] [Created] (APLO-280) Clarification about message groups
Date Mon, 17 Dec 2012 07:26:12 GMT
Lionel Cons created APLO-280:
--------------------------------

             Summary: 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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