I believe this segregation is typically done with instances of multiple load
balancers. I'm not an expert on the mod_jk stuff, but you'd probably want to
implement this with multiple load balancers regardless, when you're getting up
to that many instances.
Bear in mind that this piece of your setup is acting as a single point of
failure in front of your Tomcat cluster.
Paul McGurn | Manager, Customer Support
Escalations Operations
· ·· LogMeIn, Inc.
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-Original Message-
From: Kevin Phillips [mailto:[EMAIL PROTECTED]
Sent: Wednesday, September 17, 2008 12:04 PM
To: users@tomcat.apache.org
Subject: session replication / cluster groups
Hi, I have tomcat clustering working well with an apache load balancer in front
(sticky session). I have around 10 at the moment, and I soon need to add at
least 20 to 30 more. The configuration for session replication is all-to-all,
using multicast. My aim is to reduce the session traffic between servers, so I
am looking for alternatives. The Tomcat 6 book (o reilly) states:
If you find that you have too many nodes in your cluster for all-to-all
replication, you can [..] segment your network such that half of your nodes are
in one group and half are in another group (or implement primary/secondary
clustering).
I assume that segmentation is done by supplying a different multicast ip/port
to the two groups, however, how will the apache (mod_proxy) know the right
group member to fall to?
Regards,
K. Phillips
-
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