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From Brandon Williams <>
Subject Re: Cassandra benchmark shows OK throughput but high read latency (> 100ms)?
Date Tue, 16 Feb 2010 18:01:58 GMT
On Tue, Feb 16, 2010 at 11:56 AM, Weijun Li <> wrote:

> One more thoughts about Martin's suggestion: is it possible to put the data
> files into multiple directories that are located in different physical
> disks? This should help to improve the i/o bottleneck issue.
Yes, you can already do this, just add more <DataFileDirectory> directives
pointed at multiple drives.

> Has anybody tested the row-caching feature in trunk (shoot for 0.6?)?

Row cache and key cache both help tremendously if your read pattern has a
decent repeat rate.  Completely random io can only be so fast, however.


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