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From aaron morton <>
Subject Re: Changing bloom filter false positive ratio
Date Fri, 14 Sep 2012 09:08:02 GMT
I have a hunch that the SSTable selection based on the Min and Max keys in ColumnFamilyStore.markReferenced()
means that a higher false positive has less of an impact. 

it's just a hunch, i've not tested it. 


Aaron Morton
Freelance Developer

On 14/09/2012, at 4:52 AM, Peter Schuller <> wrote:

>> changing it on some of them.  Can I just change that value through the
>> cli and restart or are there any concerns I should have before trying
>> to tweak that parameter?
> You can change it, you don't have to restart. It will take effect on
> new sstables - flushed and compacted, not on pre-existing sstables.
> Keep in mind that you can get to about half the size of the default
> (iirc with about 10% fp chance). Beyond that you have extremely
> diminishing returns.
> -- 
> / Peter Schuller (@scode,

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