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Date: Thu, 19 Apr 2007 10:24:31 -0700 (PDT)
From: Pete Schwamb <pete@meteostar.com>
To: users@activemq.apache.org
Subject: Parallel processors on a single topic/queue
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I'm using activemessaging to connect to a stomp interface on an ActiveMQ
broker, and having trouble processing all of the messages that are coming
over my subscription to a topic.

The messages take a fair amount of cpu as they must be unzipped, processed,
and stored to the db.  So much that I'd like to add another processor
(subscriber) to help keep up with the message flow, but I'm not sure how to
make two clients feed off of the same topic (not a queue, currently).

I tried adding a subcriptionName attribute to my subscription, and started
two processors, but that turned it into a durable subscription, and messages
started backing up, and activemq hung!

I'd rather keep it a non-durable subscription, as I have a
MaximumPendingMessageLimit set and would like to discard messages when the
subscribers can't keep up.  I'd also like to keep sending the messages to a
topic rather than a queue, as there are other systems that subscribe to this
same topic.

Is there a way to do what I'd like to, and not have messages pile up in the
broker when the subscriber is slow for any reason?  I have a feeling that
this is possible, but I just don't know the right approach/configuration.

Thanks,

-Pete
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