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From "Hiram Chirino" <>
Subject Re: message group question
Date Fri, 15 Aug 2008 14:11:22 GMT
On Fri, Aug 15, 2008 at 9:22 AM, Mark Webb <> wrote:
> I would like to take advantage of the message group feature in ActiveMQ
> 5.1.  After reading the page (,
> I have a question.
> Is the message group feature for multiple consumers on the same
> queue/topic?

yes multiple consumers on 1 queue.  (Not supported on topics)

> What I mean is that in the example, there are consumers interested in stocks
> (IBM,MSFT, SUNW..etc).  Are these consumers all subscribed to the same
> topic/queue or different topics/queues?

same queue.

> Assuming that these consumers all subscribe to the same topic/queue, are
> there any implications with creating hundreds (or thousands) or message
> groups?

No.  We use a hash calculation on the group id to select the consumer
so there is no memory issues if a large number of groups used.

> Thanks.



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