Hi Pedro, I have a looong open JIRA [1] and so I've tried to look into current ordering of locks. And I've noticed that we don't sort the keys anymore but have a short 'big lock' [2] - I don't fully understand it, though. What happens if T1 has A locked and T2 tries to lock A and B? Is T2 allowed to acquire lock on B and waits for A? Are the locks 'fair' and the synchronized block introduces an ordering on the lock requests? Thanks Radim [1] https://issues.jboss.org/browse/ISPN-2491 [2] https://github.com/infinispan/infinispan/blob/master/core/src/main/java/o... -- Radim Vansa <rvansa(a)redhat.com&gt; JBoss Performance Team