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From Anand Somani <>
Subject Linear scalability problems
Date Wed, 03 Apr 2013 13:49:08 GMT

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.


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