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From boday <ben.o...@initekconsulting.com>
Subject Re: Fwd: Message groups enhancement feature request
Date Fri, 01 Jul 2011 04:21:33 GMT
Is your issue that certain consumers become too slow?  If so, you can always
set the JMSXGroupSeq header to −1 to force a new consumer (maybe set this
periodically or after a certain number of messages)...    

here is a good article that discusses this a bit...

http://scottcranton.blogspot.com/2010/09/activemq-message-groups.html

Either way, I'd think this could be a feature of the message groups. 
Basically let you specify a frequency (either elapsed time or message count)
to force a new consumer for a group.  Would serve to better randomize the
load across consumers to protect against slow consumers, etc... 


Martin C. wrote:
> 
> Hi,
> 
> we currently use message groups to ensure ordered delivery of messages
> within a given group. As noted on the documentation for message
> groups, this often does not scale very well with variable consumer
> counts, as in this case the oldest consumers will hog all message
> groups.
> 
> In our use-case, and I suppose this might apply to others as well, we
> simply don't care which consumer consumes which message, but only,
> that the next message from the same message group is not consumed
> before the first has been processed. So my idea would be to add a
> configuration option, that a consumer will release the message group
> directly after consuming its current message, releasing the message
> group for re-distribution to other brokers.
> 
> Would something like this be possible / do I overlook some downside of
> this approach?
> 
> Best regards,
> Martin
> 


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