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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: performance tuning - where does the slowness come from?
Date Thu, 06 May 2010 14:22:24 GMT
columns, not CFs.

put another way, how wide are the rows in the slow CF?

On Wed, May 5, 2010 at 11:30 PM, Ran Tavory <rantav@gmail.com> wrote:
> I have a few CFs but the one I'm seeing slowness in, which is the one with
> plenty of cache misses has only one column per key.
> Latency varies b/w 10m and 60ms but I'd say average is 30ms.
>
> On Thu, May 6, 2010 at 4:25 AM, Jonathan Ellis <jbellis@gmail.com> wrote:
>>
>> How many columns are in the rows you are reading from?
>>
>> 30ms is quite high, so I suspect you have relatively large rows, in
>> which case decreasing the column index threshold may help.

-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com

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