> I think you should just tell everybody that if you want to use QUORUM you > need RF >= 3 for it to be meaningful. > > No one would use QUORUM with RF < 3 except in error.
Well, strictly speaking you could have an application designed to talk to Cassandra at QUORUM and an operator may choose to deploy it against an RF=2 cluster, accepting the fact that the application won't survive a node going down. For example, maybe write's are done at QUORUM (for durability rather than consistency) and reads at ONE. (I"ve been meaning to suggest it at some point btw, but consistency and durability are different concerns. For durability purposes it would be nice to say "require two nodes", rather than having to choose between ONE and QUORUM.) -- / Peter Schuller
