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From Benjamin Black...@b3k.us>
Subject Re: 4k keyspaces... Maybe we're doing it wrong?
Date Tue, 07 Sep 2010 23:41:52 GMT
Really depends on your memtable settings and your memory.  Larger
memtables are generally better, so having lots of active ones works
against making them as large as you might want.  For example, if the
flush MB threshold is 256 (which is the low end of what I recommend),
even 50 of them could consume over 10GB.


b

On Tue, Sep 7, 2010 at 9:32 AM, Ned Wolpert <ned.wolpert@imemories.com> wrote:
> This might be a loaded question... what is a 'lot of CFs'? 50? 250? 500?  I
> say loaded because I know that its probably dependent on how many keys
> (size) are in a column family.
>
> On Mon, Sep 6, 2010 at 7:53 PM, Benjamin Black <b@b3k.us> wrote:
>>
>> On Mon, Sep 6, 2010 at 12:41 AM, Janne Jalkanen
>> <Janne.Jalkanen@ecyrd.com> wrote:
>> >
>> > So if I read this right, using lots of CF's is also a Bad Idea(tm)?
>> >
>>
>> Yes, lots of CFs is bad means lots of CFs is also bad.
>
>
>
> --
> Virtually, Ned Wolpert
>
> "Settle thy studies, Faustus, and begin..."   --Marlowe
>

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