From user-return-28605-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org Thu Sep 6 16:25:06 2012 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 BA6CBD7AD for ; Thu, 6 Sep 2012 16:25:06 +0000 (UTC) Received: (qmail 2264 invoked by uid 500); 6 Sep 2012 16:25:04 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 2224 invoked by uid 500); 6 Sep 2012 16:25:04 -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 2216 invoked by uid 99); 6 Sep 2012 16:25:04 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 06 Sep 2012 16:25:04 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=FSL_RCVD_USER,HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of chongz.zhang@gmail.com designates 209.85.212.170 as permitted sender) Received: from [209.85.212.170] (HELO mail-wi0-f170.google.com) (209.85.212.170) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 06 Sep 2012 16:24:56 +0000 Received: by wibhq12 with SMTP id hq12so5627426wib.1 for ; Thu, 06 Sep 2012 09:24:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=xx/aBXs+geVWW3QcvL+RchtfsQaiERgLBUNPK/jnfIw=; b=VQShWzl3qT/6wgDTY4pDh9g6rdB+LZPzIwHHI0Srfo2KmVAIehYQDy7cO9B6t3DjvP cdqxSDY6UKzC3Em3nIl+6/gNWfJ/U1HiqXLlsoHBINTvZN3Bb+wxiWCMvZhUFBESDWop VJ/hnlo4kCWUQkVq8wB4bDmQWCYBToHFSY06PWCR4RWQt7iH0hs8B9MCeNGuYoY2h27d mSslzpp51j+cf2TZv9tfv/nT3BhMzdNg16r4uK9HFMPGr7BaXRAjMl0rygJRJgvGU31b 8kprbpGw8O5Q/v1KUYQi2v1KuzdIlWdkDLjMrdE+raw9VVNZvv0N6DwLPru6/nurmgf7 Agcw== MIME-Version: 1.0 Received: by 10.217.1.7 with SMTP id m7mr1542143wes.158.1346948675563; Thu, 06 Sep 2012 09:24:35 -0700 (PDT) Received: by 10.223.180.201 with HTTP; Thu, 6 Sep 2012 09:24:35 -0700 (PDT) Date: Thu, 6 Sep 2012 12:24:35 -0400 Message-ID: Subject: EACH_QUORUM for one DC From: Chong Zhang To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=20cf301e2f5756705304c90aeda9 X-Virus-Checked: Checked by ClamAV on apache.org --20cf301e2f5756705304c90aeda9 Content-Type: text/plain; charset=ISO-8859-1 Hi, If there is only one DC, can we still use EACH_QUORUM for write? We only have one DC now, but will build another one in future and like to use EACH_QUORUM when there are two. But like to know if it's good to use EACH_QUORUM with the current 1 DC. And if there are two DCs but in some cases one whole DC cluster is down, does that mean all the writes are going to fail? Thanks, Chong --20cf301e2f5756705304c90aeda9 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi,

If there is only one DC, can we still use EACH_QUORU= M for write? We only have one DC now, but will build another one in future = and like to use EACH_QUORUM when there are two. But like to know if it'= s good to use EACH_QUORUM with the current 1 DC.

And if there are two DCs but in some cases one whole DC= cluster is down, does that mean all the writes are going to fail?

Thanks,
Chong =A0
--20cf301e2f5756705304c90aeda9--