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From Tyler Hobbs <>
Subject Re: Linear scalability problems
Date Wed, 03 Apr 2013 16:30:44 GMT
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 <> 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 <>

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