Return-Path: 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 1377C10332 for ; Sun, 21 Jul 2013 17:26:57 +0000 (UTC) Received: (qmail 11017 invoked by uid 500); 21 Jul 2013 17:26:53 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 10673 invoked by uid 500); 21 Jul 2013 17:26:52 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 10665 invoked by uid 99); 21 Jul 2013 17:26:51 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 21 Jul 2013 17:26:51 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW X-Spam-Check-By: apache.org Received-SPF: error (athena.apache.org: local policy) Received: from [209.85.217.175] (HELO mail-lb0-f175.google.com) (209.85.217.175) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 21 Jul 2013 17:26:47 +0000 Received: by mail-lb0-f175.google.com with SMTP id r10so4590005lbi.6 for ; Sun, 21 Jul 2013 10:26:05 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:x-gm-message-state; bh=43nNuDgT7WrNUolVek/lsWkChfFn9LMaZVgs25dqYRE=; b=j4J3SFbB+ciXacl+TaJ8iaMVvEJ7u4a2FXkWly2aFxSaHLIQWey+iMKRH31zRDahS8 mMTd72eww+jNpFrAQDt1Ka9KFocfvIDDr77ttGthviRmF5J+5JOqtygC97dp7cH6CIe9 MDuFUYHQk0fpZRSxm++GmMcsxV1bMBdSt4mbPxrzl0KfuV0jGo7GkLBRQYFB3ve+MJxj xHlXbal+asmg4vP2FUlAuV2mUYDy3TYmvp99l0r8kDJIkkomTFtfY/7GxGdye3pnDtum 5VTQIUPsQWoEKl+u+c1D5mhFoBLgtZuXUQpnJckTEgTD+qqeP618RQzc3uw3F6yMM+a8 92Ow== MIME-Version: 1.0 X-Received: by 10.112.3.234 with SMTP id f10mr10245544lbf.81.1374427564964; Sun, 21 Jul 2013 10:26:04 -0700 (PDT) Received: by 10.112.170.73 with HTTP; Sun, 21 Jul 2013 10:26:04 -0700 (PDT) In-Reply-To: References: Date: Sun, 21 Jul 2013 20:26:04 +0300 Message-ID: Subject: Re: How to avoid inter-dc read requests From: Omar Shibli To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=14dae94ee031c78e5704e208da8e X-Gm-Message-State: ALoCoQkvPp/IHPIThXraDUbyK4I9cs+lCegogtTTkaI2k/zig7Rl7I0ElwLpcoRbeh8tmxy5nBXd X-Virus-Checked: Checked by ClamAV on apache.org --14dae94ee031c78e5704e208da8e Content-Type: text/plain; charset=ISO-8859-1 One more thing, I'm doing a lot of key slice read requests, is that supposed to change anything? On Sun, Jul 21, 2013 at 8:21 PM, Omar Shibli wrote: > I'm seeing a lot of inter-dc read requests, although I've followed > DataStax guidelines for multi-dc deployment > http://www.datastax.com/dev/blog/deploying-cassandra-across-multiple-data-centers > > Here is my setup: > 2 data centers within the same region (AWS) > Targeting DC, RP 3, 6 nodes > Analytic DC, RP 3, 11 nodes > > All the read/write request are issued with CL local quorum, but still > there're a lot of inter-dc read request. > Any suggestion, or am I missing something? > > Thanks in advance, > --14dae94ee031c78e5704e208da8e Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
One more thing, I'm doing a lot of key slice read requ= ests, is that supposed to change anything?=A0

On Sun, Jul 21, 2013 at 8:21 PM, Omar Shibli <omar@eyeviewdigit= al.com> wrote:
I'm seeing a lot o= f inter-dc read requests, although I've followed DataStax guidelines fo= r multi-dc deployment=A0http://www.dat= astax.com/dev/blog/deploying-cassandra-across-multiple-data-centers

Here is my setup:
2=A0data centers=A0within t= he same region (AWS)
Targeting DC, RP 3, 6 nodes
Analyt= ic DC, RP 3, 11 nodes

All the read/write requ= est are issued with CL local quorum, but still there're a lot of inter-= dc read request.
Any suggestion, or am I missing something?

Th= anks in advance,

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