Decided to provide a policy based approach here. When we get a JGroups notification of a merge, provide plugins that allow for: 1) Evict entire cluster state (useful with Hibernate) 2) Evict cache state of the losing sub-cluster 3) Throw exception, stop cache (useful if we need to force some manual cleanup) 4) Perform merging of disjointed subtrees. (Maybe later - this "plugin" could be released in future) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4110174#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...