Return-Path: 
 <user-return-26429-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 663B399CD
	for <apmail-cassandra-user-archive@www.apache.org>;
 Wed, 23 May 2012 23:35:32 +0000 (UTC)
Received: (qmail 1265 invoked by uid 500); 23 May 2012 23:35:29 -0000
Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org
Received: (qmail 1230 invoked by uid 500); 23 May 2012 23:35:29 -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 1219 invoked by uid 99); 23 May 2012 23:35:29 -0000
Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136)
    by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 23 May 2012 23:35:29 +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 driftx@gmail.com designates
 74.125.82.44 as permitted sender)
Received: from [74.125.82.44] (HELO mail-wg0-f44.google.com) (74.125.82.44)
    by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 23 May 2012 23:35:24 +0000
Received: by wgbdr13 with SMTP id dr13so6233259wgb.25
        for <user@cassandra.apache.org>; Wed, 23 May 2012 16:35:03 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:in-reply-to:references:from:date:message-id:subject:to
         :content-type;
        bh=nd5PMPQwbmWg82WlpngiB1QFPMoe8K90BVuS2K4DXSI=;
        b=KiNrh6AVz6D3qZxnKRGZo5vGb6MeMUq8wEf0cftMYRAfiOAQCVz6O+dbrA0eIuckUy
         Jd4kjeDnZd2Hps33Q857AscXBaNzCf7a3np/iLMvQPUFDh9wJgZtTSyzQJ31xkufjNus
         sQeyM77JzlF7Ij3BM9dVeV+fC/df/Md7X3WgFAUYYtsdirbSBrrdVVZujQv0kHuhaqmu
         KOdfWD1/GyqUIVcQSUFIKXTXlUsXLToFE/O+W4ih8uyNmvqYc9Yoh2WyNrhktCvf9fEa
         fq8i2LiGJMp8qi5wdXPDfFN9uQwXFLSsyYsYEU+O10DluoOlswMrCoU0/y3/hXY99nTm
         R52A==
Received: by 10.216.140.136 with SMTP id e8mr16028109wej.62.1337816100365;
 Wed, 23 May 2012 16:35:00 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.216.47.67 with HTTP; Wed, 23 May 2012 16:34:40 -0700 (PDT)
In-Reply-To: <2C85E14562B39345BCCAD90B8E7955C913E4B4@DKEXC002.adform.com>
References: 
 <CAGiE6h9-_3UsgBwdNbisfeP_ETJez8QqBd2jFrtE-qXSX9RQWQ@mail.gmail.com>
 <5465E653-8578-42EF-A849-360610DC11DB@thelastpickle.com>
 <2C85E14562B39345BCCAD90B8E7955C913E4B4@DKEXC002.adform.com>
From: Brandon Williams <driftx@gmail.com>
Date: Wed, 23 May 2012 18:34:40 -0500
Message-ID: 
 <CAAafH9Sk05O86m-w6x4H7XvSO3nJ1HZEwUwPYy7NgLOGsZKOeQ@mail.gmail.com>
Subject: Re: Replication factor
To: user@cassandra.apache.org
Content-Type: multipart/alternative; boundary=0016e6de04ef6fe6a604c0bc9539
X-Virus-Checked: Checked by ClamAV on apache.org

--0016e6de04ef6fe6a604c0bc9539
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: quoted-printable

On Wed, May 23, 2012 at 5:51 AM, Viktor Jevdokimov <
Viktor.Jevdokimov@adform.com> wrote:

>  > When RF =3D=3D number of nodes, and you read at CL ONE you will always=
 be
> reading locally.****
>
> =93always be reading locally=94 =96 only if Dynamic Snitch is =93off=94. =
With
> dynamic snitch =93on=94 request may be redirected to other node, which ma=
y
> introduce latency spikes.
>

Actually it's preventing spikes, since if it won't read locally that means
the local replica is in worse shape than the rest (compacting, repairing,
etc.)

-Brandon

--0016e6de04ef6fe6a604c0bc9539
Content-Type: text/html; charset=windows-1252
Content-Transfer-Encoding: quoted-printable

<div class=3D"gmail_quote">On Wed, May 23, 2012 at 5:51 AM, Viktor Jevdokim=
ov <span dir=3D"ltr">&lt;<a href=3D"mailto:Viktor.Jevdokimov@adform.com" ta=
rget=3D"_blank">Viktor.Jevdokimov@adform.com</a>&gt;</span> wrote:<br><bloc=
kquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #cc=
c solid;padding-left:1ex">







<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div><div class=3D"im">
<p class=3D"MsoNormal">&gt; When RF =3D=3D number of nodes, and you read at=
 CL ONE you will always be reading locally.<u></u><u></u></p>
</div><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d">=93always be readin=
g locally=94 =96 only if Dynamic Snitch is =93off=94. With dynamic snitch =
=93on=94 request may be redirected to other node, which may introduce laten=
cy
 spikes.</span></p></div></div></blockquote><div><br></div><div>Actually it=
&#39;s preventing spikes, since if it won&#39;t read locally that means the=
 local replica is in worse shape than the rest (compacting, repairing, etc.=
)</div>

<div><br></div><div>-Brandon=A0</div></div>

--0016e6de04ef6fe6a604c0bc9539--