Correct. But, in that case vector clocks does not help you either [unless you are okay with both writers thinking they have "won" for an unbounded period of ti

Correct. But, in that case vector clocks does not help you either [unless you are okay with both writers thinking they have "won" for an unbounded period of time]; what you really need is true linearizability: http://www.datastax.com/dev/blog/lightweight-transactions-in-cassandra-2-0 http://www.datastax.com/dev/blog/lightweight-transactions-in...