Return-Path: X-Original-To: apmail-hbase-user-archive@www.apache.org Delivered-To: apmail-hbase-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 2384B1068B for ; Sat, 8 Mar 2014 19:55:50 +0000 (UTC) Received: (qmail 75782 invoked by uid 500); 8 Mar 2014 19:55:46 -0000 Delivered-To: apmail-hbase-user-archive@hbase.apache.org Received: (qmail 75685 invoked by uid 500); 8 Mar 2014 19:55:45 -0000 Mailing-List: contact user-help@hbase.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@hbase.apache.org Delivered-To: mailing list user@hbase.apache.org Received: (qmail 75675 invoked by uid 99); 8 Mar 2014 19:55:45 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 08 Mar 2014 19:55:45 +0000 X-ASF-Spam-Status: No, hits=-0.7 required=5.0 tests=RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of nidmgg@gmail.com designates 209.85.220.170 as permitted sender) Received: from [209.85.220.170] (HELO mail-vc0-f170.google.com) (209.85.220.170) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 08 Mar 2014 19:55:39 +0000 Received: by mail-vc0-f170.google.com with SMTP id hu8so5725631vcb.1 for ; Sat, 08 Mar 2014 11:55:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=references:mime-version:in-reply-to:content-type :content-transfer-encoding:message-id:cc:from:subject:date:to; bh=tP/JPXtYPTj+hF3Ra6phj2FEETB0jfxZwgcSZYGfQww=; b=ZcxK+1uZEKwnI6+qo53xUj7sqRAZPjbwPm9hQt699+NsCn084RT9Wuti86RmEaw80v xvX7a4GlXGzxmqaV4FYlbs9P65SCRJeM2nMhi5qWG1Mj3LyTGFcoYOQIGiFehvsklJ4r RfCITGUScjq9wKLBd5eNy84UP4RPyCzClWL0IQ3CUn8ztIr6b39sWPzeHru0beVJU1Aa O/QalIjmpuZz5Hg8kSYdtYjJeLNWMXr0GV1I7a6FdGcohuHWr16ucsQlM3Cd1WDH2uhX AC6uzT+3h+q7kn1v227Jmc2F4jkNVFvABA+M6pPs1Z1TWKj5LqnWICKABpiD1VXV8lN9 6WTQ== X-Received: by 10.58.123.70 with SMTP id ly6mr142479veb.26.1394308517916; Sat, 08 Mar 2014 11:55:17 -0800 (PST) Received: from [10.235.146.44] ([32.128.245.163]) by mx.google.com with ESMTPSA id ho10sm36089985vdb.12.2014.03.08.11.55.16 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sat, 08 Mar 2014 11:55:17 -0800 (PST) References: Mime-Version: 1.0 (1.0) In-Reply-To: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Message-Id: <6DCA836A-ECA6-4A83-A237-81987CDF9347@gmail.com> Cc: "user@hbase.apache.org" X-Mailer: iPhone Mail (10B329) From: Demai Ni Subject: Re: replication Date: Sat, 8 Mar 2014 11:55:12 -0800 To: "user@hbase.apache.org" X-Virus-Checked: Checked by ClamAV on apache.org Your understanding is correct and you can actually put/delete to the same ta= ble on both cluster. It is called master-master setup(aka active-active in R= DMS).=20 The only issue is about the sequence of transactions. I am not sure how the t= imestamp works to ensure the same order from client can be ensured by two cl= uster Demai on the run On Mar 8, 2014, at 11:45 AM, Koert Kuipers wrote: > do i understand it correctly that it is safe to have 2 hbase clusters > replicate to each other (so in both directions)? >=20 > and as long as an update (put/delete) arrives at only one cluster this > setup will function correctly? >=20 > not entirely sure about situation where updates get routed to both > clusters, but i see no immediate harm if the operations are idempotent... >=20 > thanks! koert