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I would like to know any experience with the Tomcat Session Cluster solution. Is it production level? Does it scale? Can I use it in a server farm? Do you recommend any other solution for a session cluster? (Ex: database, terracota, jgroups, etc.)
From all the documentation I’ve read, it will work fine for a few number of instances but then become an issue.
We use Tomcat as our backend servers but design our applications to use as little session information as possible (basically just logins). Then we front the Tomcats with a load balancer like Apache or Nginx (the later which I’m favoring recently) and use sticky sessions. If a server goes offline (which is unlikely) then the user simply needs to login again, which depending on how you set it up could be transparent to them.
When I was looking to do more session based clustering, Terracotta looked very impressive. But stateless design makes scaling much easier.