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