Cassandra does, you can write with a write consistency of W and read with a read consistency of R, and as long as their sum is greater than the replication fact

Cassandra does, you can write with a write consistency of W and read with a read consistency of R, and as long as their sum is greater than the replication factor (number of copies to store across the cluster) you have consistent reads. W + R > N. http://wiki.apache.org/cassandra/ArchitectureOverview#line-190 http://wiki.apache.org/cassandra/ArchitectureOverview#line-1...