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  Tutorial: Monitoring Session Replication in J2EE Clusters

Clustering has become one of the most common and most emphasized features of J2EE application servers, because, along with load balancing, it is the fundamental element on which the scalability and reliability of an application server rely.

Tutorial Details:

Nowadays, J2EE clustering is generally associated with the mechanism used to replicate the information stored in a session across different instances of an application server. Whenever a failure happens in a stateful application, a cluster allows the failover to occur in a way that is transparent to the incoming requests: application servers take care of replicating the session information to the participants in the cluster.

Each application server allows you to customize different aspects of a cluster. Two examples are the replication scope ("How many nodes do I want to share my session across?") and the replication trigger ("When do I want to replicate the information?"). However, once a cluster is up and running, it is usually difficult to analyze its behavior. The reason for this is that application servers use low-level APIs to implement their clusters and do not expose any metrics about what's going on underneath the application's code.


 

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