The API provides for Quourm CL to be used either across all replicas (ignoring DC's), the local DC or each DC. See Consistency level here http://wiki.apache.org/cassandra/API
Hope that helps Aaron On 19 Mar 2011, at 06:54, mcasandra wrote: > When in active/active data center how to decide right replication factor? > Client may connect and request for the information from either data center > so if locally it's RF=3 then in multiple data center should it be RF=6 in > active/active? > > Or what happens if it's RF=3 with network toplogy and 2 copies are stored in > Site A and 1 copy in Site B data center. Now client for some reason is > directed to Site B data center and does a write, now would Site B have 2 > copies and Site A one (or still 2)? It's getting confusing slowly :) I have > several more questions but will start with understanding this first. > > -- > View this message in context: > http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Active-Active-Data-Center-and-RF-tp6185528p6185528.html > Sent from the cassandra-u...@incubator.apache.org mailing list archive at > Nabble.com.
