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From Brandon Williams <dri...@gmail.com>
Subject Re: Cassandra benchmarking on Rackspace Cloud
Date Sat, 17 Jul 2010 18:31:11 GMT
On Sat, Jul 17, 2010 at 12:02 PM, Schubert Zhang <zsongbo@gmail.com> wrote:

> Hi Jonathan,
> The 7k reads/s is very high, could you please make more explain about your
> benchmark?
>
> 7000 reads/s makes average latency of each read operation only talks
> 0.143ms. Consider 2 disks in the benchmark, it may be 0.286ms.
>
> But in most random read applications on very large dataset, OS cache and
> Cassandra Key/Row cache is not so effective. So, I guess, maybe for a test
> on large dataset (such as 1TB) , random reads, the result may not so good.


Most of the data was hot in either the row/key cache, or in the OS file
cache.  The point was to benchmark Cassandra, not how fast the disk can
seek.

-Brandon

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