The Tomcat 5 server provides built-in support for clustering and session replication. This first article in this series will provide an overview of session persistence and the inner works of session replication in Tomcat clusters.
Tutorial Details:
A server that\'s part of a cluster provides both scalability and failover capabilities. A cluster is a group of multiple server instances running simultaneously and working together to provide high availability, reliability, and scalability.
The Cluster element in server.xml was refactored so that we can replace different parts of the cluster without affecting the other elements.
There are two kinds of sessions handled by a server cluster: sticky sessions and replicated sessions. Sticky sessions are those sessions that stay on the single server that received the web request. The other cluster members don\'t have any knowledge of the session state in the first server. If the server that has the session goes down, the user has to again log in to the web site and re-enter any data stored in the session.
In the second session type, the session state in one server is copied to all of the other servers in the cluster. The session data is copied whenever the session is modified. This is a replicated session.
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