Hi all, I have a question about the propagation of the RollbackCommand in Infinispan 5.2.0 when I use the Optimistic locking scheme and the Distribution clustering mode. In particular I have noticed that a RollbackCommand command for a transaction T is propagated on a set of nodes S even if T's coordinator has never sent and it will never send a PrepareCommand command to nodes in S. I try to make clear the issue by the following example. Suppose you have a transaction T executing on node N0 and T writes on keys k0, k1, k2,...., km (m+1 keys) until it reaches the prepare phase. In addition node Ni, with i=0,...,m+1, is the ki's primary owner. If at prepare time, during the lock acquisition on the local node N0 (see visitPrepareCommand method in OptimisticLockingInterceptor class) T fails to acquire the lock on k0, an exception is thrown (e.g. TimeoutException) and T will be rolled back. In this case, when T starts the rollback phase, it seems to me that a RollbackCommand command is multicast to all nodes Nj, with j=1,...,d, if k0 is sorted after kj during the local lock acquisition (see acquireAllLocks method in OptimisticLockingInterceptor), because: - shouldInvokeRemoteCommand method on the TxInvocationContext returns true (see BaseRpcInterceptor class); - getAffectedKeys on the TxInvocationContext returns the set {k1,..., kd} (see visitRollbackCommand in DistributionInterceptor class). Is it correct? If I'm not wrong, which is the design choice behind this implementation? Thank you. Best regards, Sebastiano Peluso -- Sebastiano Peluso, PhD student Department of Computer, Control and Management Engineering Sapienza University of Rome Via Ariosto 25, 00185, Rome, Italy Tel. +39 06 77274108 Webpage http://www.dis.uniroma1.it/~peluso Distributed Systems Group, INESC-ID Instituto Superior Técnico Rua Alves Redol 9, 1000-029, Lisbon, Portugal Webpage http://www.gsd.inesc-id.pt/~peluso