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From "Mark Gellings (JIRA)" <>
Subject [jira] Created: (AMQ-3027) Message Groups and Group Sequence -1 sending messages in group to multiple consumers
Date Wed, 10 Nov 2010 19:58:19 GMT
Message Groups and Group Sequence -1 sending messages in group to multiple consumers

                 Key: AMQ-3027
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.4.1
         Environment: Windows Server 2008 for broker, Windows 7 for clients, NMS
            Reporter: Mark Gellings

I am using message groups with ActiveMQ 5.4.1 and when ending the group I'm seeing some odd

I run two consumers on Queue A.  There is a 200ms delay when processing a message.  I have
a producer send 500 messages with group A to the broker with the last having a group sequence
of -1.  The first consumer starts processing messages from group A while the producer is creating
the messages, but as soon as the broker gets the message with group sequence of -1 that message
gets sent to the second consumer, and then the remaining in the group go to the second consumer.
 So the processing is out of order and all the messages don't go to the same consumer.  

I believe only messages created after the one with group sequence of -1 should go to the second
consumer.  And the message with -1 sequence gets processed last.   Should this also be the
case if the master broker fails over during this time?

Issue AMQ-2952 does not appear to be the same issue.  Unfortunately I do not have time to
test this against the current snapshot or include a test case.  The scenario, however, is
very simple and I'm sure it would be easy to whip up an example.

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