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 D92489075 for ; Wed, 16 Nov 2011 20:53:40 +0000 (UTC) Received: (qmail 33018 invoked by uid 500); 16 Nov 2011 20:53:35 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 32974 invoked by uid 500); 16 Nov 2011 20:53:35 -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 32966 invoked by uid 99); 16 Nov 2011 20:53:35 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 16 Nov 2011 20:53:35 +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 (athena.apache.org: domain of sylvain@datastax.com designates 209.85.213.44 as permitted sender) Received: from [209.85.213.44] (HELO mail-yw0-f44.google.com) (209.85.213.44) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 16 Nov 2011 20:53:29 +0000 Received: by ywt34 with SMTP id 34so177001ywt.31 for ; Wed, 16 Nov 2011 12:53:08 -0800 (PST) Received: by 10.236.124.66 with SMTP id w42mr4654326yhh.32.1321476788096; Wed, 16 Nov 2011 12:53:08 -0800 (PST) MIME-Version: 1.0 Received: by 10.236.103.13 with HTTP; Wed, 16 Nov 2011 12:52:47 -0800 (PST) In-Reply-To: References: From: Sylvain Lebresne Date: Wed, 16 Nov 2011 21:52:47 +0100 Message-ID: Subject: Re: Efficiency of Cross Data Center Replication...? To: user@cassandra.apache.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable To be complete, https://issues.apache.org/jira/browse/CASSANDRA-3472 is relevant. -- Sylvain On Wed, Nov 16, 2011 at 9:40 PM, Jake Luciani wrote: > the former > > On Wed, Nov 16, 2011 at 3:33 PM, Brian Fleming > wrote: >> >> Hi All, >> >> I have a question about inter-data centre replication : if you have 2 Da= ta >> Centers, each with a local RF of 2 (i.e. total RF of 4) and write to a n= ode >> in DC1, how efficient is the replication to DC2 - i.e. is that data : >> =A0- replicated over to a single node in DC2 once and internally replica= ted >> =A0or >> =A0- replicated explicitly to two separate nodes? >> Obviously from a LAN resource utilisation perspective, the former would = be >> preferable. >> Many thanks, >> Brian > > > > -- > http://twitter.com/tjake >