Much anticipated by the user community, Buddy Replication is a feature that allows JBoss Cache instances to replicate to nominated buddies in a cluster rather than the entire cluster. Benefits include a high degree of scalability, with savings in both memory usage as well as network traffic, both of which would remain static even when nodes are added to a cluster. This differs from total replication where both memory usage and network traffic can increase geometrically with each node added to a cluster.
This feature affects all aspects of JBoss clustering, including HTTP session replication in Tomcat.
Buddy Replication is the main feature of
JBoss Cache 1.4.0 "Jalapeno", due for release by mid-May 2006. Visit
the JBoss Cache roadmap for more information on future releases, or
the Buddy Replication design page or
design discussion forum to comment on this.
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Manik Surtani
Lead, JBoss Cache