Hello All,

I'm trying to get a better understanding when to use Session Affinity and Session Replication and have a question. Let me set my question up by describing my configuration. It consists of an Apache server with mod_jk and two Tomcat servers, where the Apache server is configured to load-balance between the two Tomcat servers. So my question is, if I enable session affinity but not session replication, how can I failover a connection without losing the session data?

Let me restate my question more like a use case:

   - Given the above configuration of Apache and 2 Tomcat servers

   - A session has already been started on Tomcat-1 (session contains data)

   - A new request comes in with the same session id. Session affinity is on so the request should go to Tomcat-1. But Tomcat-1 is down so the request fails over to Tomcat-2.

   - Since session replication is not enabled how does Tomcat-2 get the session data? Or can it?


Can this problem be solved by using both sticky sessions and session replication? Or do I have to abandon session affinity and just use session replication. All the documentation I've read to date indicates not to use sticky sessions and session replication together.


Thanks,
Rob


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