From user-return-24268-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org Tue Feb 21 11:45:05 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 84CB89CF3 for ; Tue, 21 Feb 2012 11:45:05 +0000 (UTC) Received: (qmail 51694 invoked by uid 500); 21 Feb 2012 11:45:03 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 51579 invoked by uid 500); 21 Feb 2012 11:45:03 -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 51569 invoked by uid 99); 21 Feb 2012 11:45:03 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 21 Feb 2012 11:45:03 +0000 X-ASF-Spam-Status: No, hits=-0.7 required=5.0 tests=FSL_RCVD_USER,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of benoit@noisette.ch designates 209.85.214.172 as permitted sender) Received: from [209.85.214.172] (HELO mail-tul01m020-f172.google.com) (209.85.214.172) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 21 Feb 2012 11:44:57 +0000 Received: by obbwd15 with SMTP id wd15so9714952obb.31 for ; Tue, 21 Feb 2012 03:44:36 -0800 (PST) Received-SPF: pass (google.com: domain of benoit@noisette.ch designates 10.60.12.103 as permitted sender) client-ip=10.60.12.103; Authentication-Results: mr.google.com; spf=pass (google.com: domain of benoit@noisette.ch designates 10.60.12.103 as permitted sender) smtp.mail=benoit@noisette.ch Received: from mr.google.com ([10.60.12.103]) by 10.60.12.103 with SMTP id x7mr11682661oeb.51.1329824676233 (num_hops = 1); Tue, 21 Feb 2012 03:44:36 -0800 (PST) MIME-Version: 1.0 Received: by 10.60.12.103 with SMTP id x7mr10007000oeb.51.1329824676150; Tue, 21 Feb 2012 03:44:36 -0800 (PST) Received: by 10.182.188.102 with HTTP; Tue, 21 Feb 2012 03:44:36 -0800 (PST) In-Reply-To: References: Date: Tue, 21 Feb 2012 12:44:36 +0100 Message-ID: Subject: Re: Cassandra 1.1 row isolation cross datacenter replication From: Benoit Perroud To: user@cassandra.apache.org Content-Type: text/plain; charset=UTF-8 X-Gm-Message-State: ALoCoQnS0poU6OAvsmYahq1icLN/i7vLQcxYyLaYtA+BgGUJw72qJeDquMQhQtm8w6IMiIT4OzAG The isolation is guarantee locally to the node. If two client are reading / writing to the same node, the one that read will not see partial mutations. 2012/2/21 Allen Servedio : > Hi, > > I saw that row level isolation was added in the beta of Cassandra 1.1 and I > have the following question: given a ring that has two datacenters and a > keyspace defined to replicate to both, if a row is written with local quorum > to the first data center, will it still be isolated when it replicates to > the other datacenter? Or is isolation for that row broken in the other > datacenter (so that isolation is essentially back to the column level for > the other datacenter)? > > Hopefully what I am asking makes sense... If not, I will give a more > detailed example. > > Thanks, > Allen -- sent from my Nokia 3210