clustering

clustering an application enables apps to scale out and cater a large audience. most renowned servers supports this feature. when one node goes down other nodes are present to cater the user requests. but what happens to the session of the server which went down? well the session replication across the cluster becomes very important in this case. if you take jboss, it replicates using messages. tomcat also supports it when it is clustered and uses a communication framework called Tribes to achieve it.

A simple how to cluster and do session replication with jboss can be found in the following article.

https://docs.jboss.org/author/display/AS71/AS7+Cluster+Howto?_sscc=t