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From Cem Cayiroglu <>
Subject Re: Linear scalability problems
Date Thu, 04 Apr 2013 14:08:57 GMT
What was the RF before adding nodes?

Sent from my iPhone

On 04 Apr 2013, at 15:12, Anand Somani <> wrote:

> We are using a single process with multiple threads, will look at client side delays.
> Thanks
> On Wed, Apr 3, 2013 at 9:30 AM, Tyler Hobbs <> wrote:
> 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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