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 5394D9392 for ; Wed, 16 Nov 2011 21:49:30 +0000 (UTC) Received: (qmail 36958 invoked by uid 500); 16 Nov 2011 21:49:28 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 36934 invoked by uid 500); 16 Nov 2011 21:49:27 -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 36926 invoked by uid 99); 16 Nov 2011 21:49:27 -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 21:49:27 +0000 X-ASF-Spam-Status: No, hits=4.0 required=5.0 tests=FREEMAIL_FROM,FREEMAIL_REPLY,HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of ehershey@gmail.com designates 74.125.82.172 as permitted sender) Received: from [74.125.82.172] (HELO mail-wy0-f172.google.com) (74.125.82.172) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 16 Nov 2011 21:49:21 +0000 Received: by wyf28 with SMTP id 28so1256111wyf.31 for ; Wed, 16 Nov 2011 13:49:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=YyL1nphXuolQLDIhX8EZx8RDcx0TV5IpsEom6Ur9/jw=; b=f3bmK68STVnuSWIcBbjTlQ+2KbbKHOdM9S2tICIyJ2VJ2Nu+CxkIMZbd/0BaHss7AX WmiuHR4Ejt8FleJxPgbAgzS6tJaD5/236UwU9ikEvbUTuqsgN+rGKkvK8QVzZ33hksia 4OyoqFd7amGeEcR/B+PpYrHkPlyxrA4VWw6Kc= Received: by 10.216.82.75 with SMTP id n53mr889605wee.85.1321480140291; Wed, 16 Nov 2011 13:49:00 -0800 (PST) MIME-Version: 1.0 Received: by 10.216.47.75 with HTTP; Wed, 16 Nov 2011 13:48:18 -0800 (PST) In-Reply-To: References: From: "ehershey@gmail.com" Date: Wed, 16 Nov 2011 16:48:18 -0500 Message-ID: Subject: Re: Efficiency of Cross Data Center Replication...? To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=0016e6de17d956fe2304b1e112c0 --0016e6de17d956fe2304b1e112c0 Content-Type: text/plain; charset=ISO-8859-1 On a related note - assuming there are available resources across the board (cpu and memory on every node, low network latency, non-saturated nics/circuits/disks), what's a reasonable expectation for timing on replication? Sub-second? Less than five seconds? Ernie On Wed, Nov 16, 2011 at 4:00 PM, Brian Fleming wrote: > Great - thanks Jake > > B. > > On Wed, Nov 16, 2011 at 8:40 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 >>> Data Centers, each with a local RF of 2 (i.e. total RF of 4) and write to a >>> node in DC1, how efficient is the replication to DC2 - i.e. is that data : >>> - replicated over to a single node in DC2 once and internally replicated >>> or >>> - 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 >> > > --0016e6de17d956fe2304b1e112c0 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On a related note - assuming there are available resources across the board= (cpu and memory on every node, low network latency, non-saturated nics/cir= cuits/disks), what's a reasonable expectation for timing on replication= ? Sub-second? Less than five seconds?=A0

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