[infinispan-dev] tx optimizations

Hi, Here are two optimizations that can be implemented in our 2PC model: 1) if there are only two members int the cluster use an 1PC (or if you only replicate to one buddy, like in buddy replication). If the 1st phase fails remotely, then also rollback locally. This would reduce one network roundtrip. 2) when asked to prepare, a participant might return a value indicating that no changes were made (read-only participant), so this one won't need an commit message, so less roundtrip. Wdyt? Cheers, Mircea