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From Mark Robson <mar...@gmail.com>
Subject Re: Why Cassandra performs better in 15 nodes than in 20 nodes?
Date Sun, 23 May 2010 13:38:34 GMT
On 23 May 2010 13:42, 史英杰 <shiyingjie1983@gmail.com> wrote:

> Hi, All
>    I am now doing some tests on Cassandra, and I found that both writes and
> reads on 15 nodes are faster than that of 20 nodes, how many servers does
> one Cassandra system contains during the real applications?
>    Thanks a lot !
>
> Yingjie
>

I'd ask

Were all of those 20 nodes running real hardware (i.e. NOT VMs)?

and

Did your driver application(s) run on "real" hardware and how many threads
did you use?

Cassandra can only get good throughput with a lot of client threads, not
just a few.

Mark

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