I should have made this point clearer in the post. 2PC requires 2 round trip messages per worker (i.e. 4 total messages per worker), of which the 3rd message ca

I should have made this point clearer in the post. 2PC requires 2 round trip messages per worker (i.e. 4 total messages per worker), of which the 3rd message cannot be sent until there is a global synchronization point. The proposal replaces the 2 round trip messages with a half a round trip, which is overlapped with transaction processing. And there is no global synchronization point.