In your case, cassandra will read the data from the nearest node, and read digest from other two nodes. When those read meet requested consistency level, cassandra will return the result.
maki From iPhone On 2012/04/06, at 1:22, zhiming shen <zhiming.s...@gmail.com> wrote: > Thanks for your reply. My question is about the impact of replication on load > balancing. Say we have nodes ABCD... in the ring. ReplicationFactor is 3 so > the data on A will also have replicas on B and C. If we are reading data own > by A, and A is already very busy, will the requests be forwarded to B and C? > How about update requests? > > > Thanks, > > > Zhiming > > On Thu, Apr 5, 2012 at 12:33 AM, Watanabe Maki <watanabe.m...@gmail.com> > wrote: > I assume you are talking about nodes, rather than replicas. > The data distribution over ring depends on Partitioner and Replica placement > strategy you use. > If you are using Random Partitioner and Simple Strategy, your data will be > automatically distributed over the nodes in the ring. > > maki > > > On 2012/04/05, at 12:31, zhiming shen <zhiming.s...@gmail.com> wrote: > > > Hi, > > > > Can any one tell me whether Cassandra can do load balancing across > > replicas? How to configure it for this purpose? Thanks very much. > > > > > > Best Regards, > > > > Zhiming >
