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From Jonathan Ellis <>
Subject Re: quorum calculation seems to depend on previous selected nodes
Date Mon, 17 Jan 2011 19:00:02 GMT
Adding CL.TWO would be easy enough. :)

On Mon, Jan 17, 2011 at 12:12 PM, Peter Schuller
<> wrote:
>> 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

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support

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