If I had to guess, I would say that your client is the bottleneck, not the cluster. Are you inserting data with multiple threads or processes?
On Wed, Apr 3, 2013 at 8:49 AM, Anand Somani <meatfor...@gmail.com> wrote: > Hi, > > I am running some tests trying to scale out our application from using a 3 > node cluster to 6 node cluster. The thing I observed is that when using a 3 > node cluster I was able to handle abt 41 req/second, so I added 3 more > nodes thinking it should close to double, but instead it only goes upto bat > 47 req/second!! I am doing something wrong and it is not obvious, so wanted > some help in what stats could/should I monitor to tell me things like if a > node has more requests or if the load distribution is not random enough? > > Note I am using direct thrift (old code base) and cassandra 1.1.6. The > data model is for storing blobs (split across columns) and has around 6 CF, > RF=3 and all operations are at quorum. Also at the end of the run nodetool > ring reports the same data size. > > Thanks > Anand > -- Tyler Hobbs DataStax <http://datastax.com/>
