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From Rob Bugh <robb...@earthlink.net>
Subject Topology Question
Date Thu, 15 Feb 2007 03:32:12 GMT

Hello All,
   Is this the forum to ask How-To questons with regards to deploying
ActiveMQ in a given topology? I'm new to ActiveMQ and could use a bit of
advice. If this kind of question should be posted elsewhere, my apologies,
please point me there.

My topology
--------------
In a nutshell, I have several datacenters that need certain data to be kept
in sync. One datacenter is on the west coast, one is on the east coast, and
another is in Europe. Each datacenter has its own database, but one table in
each of the databases needs to be kept in sync with each other. Each
datacenter consists of several Tomcat servers fronted by a load balancer and
a database server.

I've read through the documentation and it seems that a network of brokers
may be what I need, but I would like to hear from others that have similar
topologies. Where things get fuzzy for me is trying to determine exactly
where the brokers will live? My first thought was to put a broker in each
Tomcat instance, running as a resource. This seems like a good choice since
it provides broker fail over, but how do you, for instance, point the
brokers at the west coast datacenter to the ones at the other datacenters?
Ideally, I want each datacenter to think of the other datacenters as having
a single broker instead of several embedded into the Tomcat instances. Can
one broker connect to another through a load balancer?

Applications running on the Tomcat instances that wants to update the table
in the database would publish to a topic. This would allow the message to be
seen by all of the datacenters. Topic listeners running as a resource in the
Tomcat instances would receive the message and update the database. The
problem with this is, since a topic is used, all listeners will receive the
message, correct? Meaning, the database will be updated multiple times, once
per listeners in a single datacenter. Ideally, I want the database to be
updated once per message.

What are some other ways to use ActiveMQ to solve this problem?

Regards,
Rob




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