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From Brandon Williams <dri...@gmail.com>
Subject Re: index file and KeysCached
Date Sun, 05 Dec 2010 16:54:48 GMT
2010/12/5 ้ญ้‡‘ไป™ <sei_wjx@126.com>

> for each sstable, there is an index file, which is loaded in memory to
> locate a particular key's offset efficiently.
>

Index files are not held in memory.


> and for each CF, KeysCached can be set to cache keys' location.
> could you pls tell me the difference between the two?
>

KeysCached are held in memory.


> I'm wondering whether it's necessary to set "KeysCached" for a CF or not.
>

Not necessary, but advantageous.

-Brandon

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