J2EE Clustering's AIM
1. Automatic load-balanced. Handling a single server cannot handle
Quantity concurrent request.
2. Scalable, fault tolerance, and fail-over. Provides a planned or unplanned zero time.
l
Clustering
Not limited to single layer
.
It can be implemented at any layer,
l
such as
cache
Floor
Web
Floor
(servlet, JSP), EJB
Floor
,
Even in the database layer
