I do not agree with this advice. It can be perfectly reasonable to have #nodes < 2*RF.
It is common to deploy a 3 node cluster with RF=3 and it works fine as long as each node can handle 100% of your data, and keep up with the workload. -Tupshin On Apr 14, 2014 5:25 AM, "Markus Jais" <markus.j...@yahoo.de> wrote: > Hello, > > currently reading the "Practical Cassandra". In the section about > replication factors the book says: > > "It is generally not recommended to set a replication factor of 3 if you > have fewer than six nodes in a data center". > > Why is that? What problems would arise if I had a replication factor of 3 > and only 5 nodes? > > Does that mean that for a replication of 4 I would need at least 8 nodes > and for a factor of 5 at least 10 nodes? > > Not saying that I would factor 5 andn 10 nodes, just curious about how > this works. > > All the best, > > Markus >
