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From: Konstantin Osipov <kostja@tarantool.org>
To: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: tarantool-patches@freelists.org, commits@tarantool.org
Subject: Re: [commits] [tarantool] 03/04: bloom: optimize tuple bloom filter size
Date: Wed, 28 Mar 2018 20:03:48 +0300	[thread overview]
Message-ID: <20180328170348.GK11829@atlas> (raw)
In-Reply-To: <20180328111615.5fltx74ujvp26dry@esperanza>

* Vladimir Davydov <vdavydov.dev@gmail.com> [18/03/28 14:50]:
> > 
> > In future, It would be nice to actually have stats about actual false
> > positive rates so that we know if the papers are BS or not.
> 
> We already have bloom.hit and bloom.miss stat counters in index.info()
> so we can calculate the false positive rate as
> 
>   bloom.miss / (bloom.hit + bloom.miss)

Do you have a test verifying that the formula works?

-- 
Konstantin Osipov, Moscow, Russia, +7 903 626 22 32
http://tarantool.io - www.twitter.com/kostja_osipov

  reply	other threads:[~2018-03-28 17:03 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-27 21:08 [commits] [tarantool] 02/04: vinyl: introduce bloom filters for partial key lookups Konstantin Osipov
     [not found] ` <20180327210938.GC11829@atlas>
2018-03-28 11:16   ` [commits] [tarantool] 03/04: bloom: optimize tuple bloom filter size Vladimir Davydov
2018-03-28 17:03     ` Konstantin Osipov [this message]
2018-03-28 17:19       ` Vladimir Davydov
2018-03-28 11:58 ` [commits] [tarantool] 02/04: vinyl: introduce bloom filters for partial key lookups Vladimir Davydov
2018-03-28 17:03   ` Konstantin Osipov

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