[jboss-user] [JBossCache] - TreeCache data integrity across cluster

Hey, These are my first steps with JBossCache, but it seems like I already face some basic problem Simple example: 2-node cluster, each with instance of treeCache. Out of AS. REPL_SYNC, locking PESSIMISTIC, state is replicated on startup. run the following algorithm on to machines concurrently: Machine A: for i=0..100 counter = tree.get(fqn,counter_key,counter_value); counter++; tree.set(fqn,counter_key); Machine B: exactly the same code The result: of course counter is <<200 since we lack synchronization of given get-put blocks. As I already found out there is no cluster-wide lock. The locks I can explicitly acquire on node are not broadcasted. It seems that I need transactions for that. Machine A: for i=0..100 beginDummyTransaction counter = tree.get(fqn,counter_key,counter_value); counter++; tree.put(fqn,counter_key); commitDummyTransaction Machine B: same as A. Unfortunatelly with such approach I get TimeoutExceptions as B for some reason cant aquire write-lock (or A). The commit is a 2PC and from logs it really seems to work sync. The lock-aquiring-problem occurs when the other transaction tries to commit. Is there any way of providing 100% integity of data when heavy updates occur in multiple cluster nodes? In my particular case, I need to buffer the stats of user buisness-logic operations of very-heavy accessed web portal. Such updates occur up to 100/sec per machine. Since there is no explicit cluster-wide locking how can I achieve it? Is there a way of aquiring write-lock at the begining of transaction (on read) and force other readers to wait till this lock is realesed on commit ? Or something like that/simulation of critical section. I may not express myself clearly here so if you need any more info let me know. Thanks for any light M. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3959719#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...