Thanks a lot for the explanations. Reading the Junit test cases also helped. I also have a question regarding (re)synchronization. For a cluster of 2 cache members A & B, imagine that: - A network failure occurs and members A & B can't "see" each other. - a transaction starts and updates the node "/node1" on member A and commits - a transaction starts and updates the exact same node on member B and commits. Then network is back again and nodes can now see each other. What would happen regarding data consistency ? I guess node versioning or timestamping is used to determine which node that should prevail when synchronizing members but if the same node is updated on both members ? Is it "the last wins" rule ? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4006595#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...