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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Bad read performances: 'few rows of many columns' vs 'many rows of few columns'
Date Wed, 10 Mar 2010 16:00:56 GMT
For the record, I note that "no row cache" is the default on
user-defined CFs; we include it in the sample configuration file as an
example only.

On Wed, Mar 10, 2010 at 9:58 AM, Sylvain Lebresne <sylvain@yakaz.com> wrote:
>> So did you disable the row cache entirely?
>
> Yes (getting back reasonable performances).
>
>>> From: Sylvain Lebresne
>>>
>>> Well, I've found the reason.
>>> The default cassandra configuration use a 10% row cache.
>>> And the row cache reads all the row each time. So it was indeed reading
>>> the
>>> full row each time even though the request was asking for only one
>>> column.
>>>
>>> Sylvain
>>
>>
>>
>

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