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. On Mon, Jan 17, 2011 at 6:08 PM, Jonathan Ellis <jbel...@gmail.com> wrote: > On Mon, Jan 17, 2011 at 9:55 AM, Samuel Benz <samuel.b...@switch.ch> > wrote: > > We have a cluster with 4 nodes. ReplicationFactor is 2, ReplicaPlacment > > is the RackAwareStrategy and the EndpointSnitch is the > > PropertyFileEndpointSnitch (with two data center and two racks each). > > > > My understanding is, that with this parameter of the cluster, it should > > be possible to update with consistency level quorum while one data > > center (two nodes) are shutdown completely. > > No. Quorum of 2 is 2. > > > Case1: > > If 'TEST' was previous stored on Node1, Node2, Node3 -> The update will > > succeed. > > > > Case2: > > If 'TEST' was previous stored on Node2, Node3, Node4 -> The update will > > not work. > > If you have RF=2 then it will be stored on 2 nodes, not 3. I think > this is the source of the confusion. > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of Riptano, the source for professional Cassandra support > http://riptano.com >
