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From Peter Schuller <>
Subject Re: reported bloom filter FP ratio
Date Sun, 25 Dec 2011 19:58:19 GMT
>                Read Count: 68844
> why reported bloom filter FP ratio is not counted like this
>>>> 10/68844.0
> 0.00014525594096798558

Because the read count is total amount of reads to the CF, while the
bloom filter is per sstable. The number of individual reads to
sstables will be higher than the number of reads to the CF (unless you
happen to have exactly one sstable or no rows ever span sstables).

/ Peter Schuller (@scode,

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