On Thu, Aug 30, 2012 at 1:14 AM, Adeel Akbar <adeel.ak...@panasiangroup.com> wrote: > Dear All, > > I am going to implement Apache Cassandra in two different data-center with 2 > nodes in each ring. I also need to set replica 2 factor in same data > center. Over the data center data should be replicates between both data > center rings. Please help me or provide any document which help to implement > this model.
http://www.datastax.com/docs/1.1/initialize/cluster_init_multi_dc has good info on building a multi-DC cluster. That said, 2 nodes per-DC means you can't use LOCAL_QUORUM/QUORUM for read & writes. I would strongly suggest 3 nodes per DC if you care about consistent reads. Generally speaking, 3 nodes per-DC is considered the recommended minimum number of nodes for a production system. -- Aaron Turner http://synfin.net/ Twitter: @synfinatic http://tcpreplay.synfin.net/ - Pcap editing and replay tools for Unix & Windows Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety. -- Benjamin Franklin "carpe diem quam minimum credula postero"
