Node locking and concurrency is important to retain data integrity. Do you have a high percentage of writes? If so, then a caching library is NOT what you need. (think about it! :) If you want to use JBoss Cache as a distributed in-memory database, then I'd recommend using pessimistic locking and a high lock acquisition timeout, but expect transactions to block considerably. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4046168#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...