A cluster is a group of servers
that work together as a single unit. They provide the ability to handle heavy
client load and balance the activity across the members that make up the cluster.
In EAServer, clustering is implemented in an internal software based mechanism.
The ability to create a cluster,
synchronize and balance load are one of the essential functionalities that an
application server must provide. An enterprise is more likely to host its critical
applications in a cluster rather than on a standalone application server. This
is because critical applications need to be running round the clock providing
reasonable response times to the clients. This paper discusses the high level
concepts involved in an EAServer cluster. It also delves into the concepts behind
synchronizing components across members of a cluster, balancing load and providing
high availability. Failover and Partitioning are also briefly discussed.
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