Return-Path: 
 <user-return-35369-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org>
X-Original-To: apmail-cassandra-user-archive@www.apache.org
Delivered-To: apmail-cassandra-user-archive@www.apache.org
Received: from mail.apache.org (hermes.apache.org [140.211.11.3])
	by minotaur.apache.org (Postfix) with SMTP id F011110B55
	for <apmail-cassandra-user-archive@www.apache.org>;
 Thu, 18 Jul 2013 01:10:02 +0000 (UTC)
Received: (qmail 91169 invoked by uid 500); 18 Jul 2013 01:10:00 -0000
Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org
Received: (qmail 91146 invoked by uid 500); 18 Jul 2013 01:10:00 -0000
Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm
Precedence: bulk
List-Help: <mailto:user-help@cassandra.apache.org>
List-Unsubscribe: <mailto:user-unsubscribe@cassandra.apache.org>
List-Post: <mailto:user@cassandra.apache.org>
List-Id: <user.cassandra.apache.org>
Reply-To: user@cassandra.apache.org
Delivered-To: mailing list user@cassandra.apache.org
Received: (qmail 91138 invoked by uid 99); 18 Jul 2013 01:10:00 -0000
Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136)
    by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 18 Jul 2013 01:10:00 +0000
X-ASF-Spam-Status: No, hits=1.5 required=5.0
	tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS
X-Spam-Check-By: apache.org
Received-SPF: pass (athena.apache.org: domain of tsato@cloudian.com designates
 209.85.223.169 as permitted sender)
Received: from [209.85.223.169] (HELO mail-ie0-f169.google.com)
 (209.85.223.169)
    by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 18 Jul 2013 01:09:55 +0000
Received: by mail-ie0-f169.google.com with SMTP id 10so5782511ied.28
        for <user@cassandra.apache.org>; Wed, 17 Jul 2013 18:09:34 -0700 (PDT)
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=google.com; s=20120113;
        h=mime-version:date:message-id:subject:from:to:content-type
         :x-gm-message-state;
        bh=coSimOFP6p1J3LzZRwWBpkwj9dBOWkLeu18JbSLBeyo=;
        b=Pvrusve17yBUAOdgLogwRnkYr9VSxoYlW1PSvqHBNm96EQ4s0zyVfSzp4F08+SkY7U
         HTtXHENevqLCPy4508PHMdUHhXnsFBoxV/bNrRNAuZir7NDFz+Az9vw9WyfJM92i3BtQ
         je+GpWXY4hnrQCEPMxTvCvyl8kHrR1rmqZyt/YCLTAjn22e3emMevAk8+OH7kayHoWjh
         mtTgk+8RKaFXHnz2BixJbQNe8nHeok6JXesZMnFuDa8pBOTINQlLkA2ktN96RRe2KxCC
         IK4Y2r2CTjhIirlai3Ed+3DBpqvO6SodPid/cV3ujEjv5kT/fdU/3XTdJ9r1GIvD3dwd
         YOZA==
MIME-Version: 1.0
X-Received: by 10.50.18.81 with SMTP id u17mr2248604igd.8.1374109774840; Wed,
 17 Jul 2013 18:09:34 -0700 (PDT)
Received: by 10.64.147.8 with HTTP; Wed, 17 Jul 2013 18:09:34 -0700 (PDT)
Date: Thu, 18 Jul 2013 10:09:34 +0900
Message-ID: 
 <CAFWg+hAsvLCjFwrJ9jHbUtNp9oQLZFyjLYG5F+B58GskXDAW0A@mail.gmail.com>
Subject: Fp chance for column level bloom filter
From: Takenori Sato <tsato@cloudian.com>
To: user@cassandra.apache.org
Content-Type: multipart/alternative; boundary=089e01494788031bfd04e1beddcb
X-Gm-Message-State: 
 ALoCoQnAcpbuYLEg+SLGO/B3ARusOxlXGyXH2RR/bizPI5YQVDHywRpvj6/sIBec4PkCwf21BndM
X-Virus-Checked: Checked by ClamAV on apache.org

--089e01494788031bfd04e1beddcb
Content-Type: text/plain; charset=ISO-8859-1

Hi,

I thought memory consumption of column level bloom filter will become a big
concern when a row becomes very wide like more than tens of millions of
columns.

But I read from source(1.0.7) that fp chance for column level bloom filter
is hard-coded as 0.160, which is very high. So seems not.

Is this correct?

Thanks,
Takenori

--089e01494788031bfd04e1beddcb
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi,<div><br></div><div><div style>I thought memory consump=
tion of column level bloom filter will become a big concern when a row beco=
mes very wide like more than tens of millions of columns.=A0</div><div styl=
e>
<br></div><div style>But I read from source(1.0.7) that fp chance for colum=
n level bloom filter is hard-coded as 0.160, which is very high. So seems n=
ot.</div><div style><br></div><div style>Is this correct?</div><div><br>
</div><div>Thanks,</div><div>Takenori</div></div></div>

--089e01494788031bfd04e1beddcb--