Return-Path: X-Original-To: apmail-hadoop-common-user-archive@www.apache.org Delivered-To: apmail-hadoop-common-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 C5D4392E4 for ; Wed, 21 Sep 2011 11:02:31 +0000 (UTC) Received: (qmail 63263 invoked by uid 500); 21 Sep 2011 11:02:28 -0000 Delivered-To: apmail-hadoop-common-user-archive@hadoop.apache.org Received: (qmail 63191 invoked by uid 500); 21 Sep 2011 11:02:28 -0000 Mailing-List: contact common-user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: common-user@hadoop.apache.org Delivered-To: mailing list common-user@hadoop.apache.org Received: (qmail 63182 invoked by uid 99); 21 Sep 2011 11:02:28 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 21 Sep 2011 11:02:28 +0000 X-ASF-Spam-Status: No, hits=-1.6 required=5.0 tests=RCVD_IN_DNSWL_MED,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (athena.apache.org: local policy) Received: from [192.6.10.60] (HELO tobor.hpl.hp.com) (192.6.10.60) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 21 Sep 2011 11:02:19 +0000 Received: from localhost (localhost [127.0.0.1]) by tobor.hpl.hp.com (Postfix) with ESMTP id 2FD78B80BD for ; Wed, 21 Sep 2011 12:01:57 +0100 (BST) X-Virus-Scanned: amavisd-new at hplb.hpl.hp.com Received: from tobor.hpl.hp.com ([127.0.0.1]) by localhost (tobor.hpl.hp.com [127.0.0.1]) (amavisd-new, port 10024) with LMTP id eQLuhZY+gOmi for ; Wed, 21 Sep 2011 12:01:57 +0100 (BST) Received: from 0-imap-br1.hpl.hp.com (0-imap-br1.hpl.hp.com [16.25.144.60]) by tobor.hpl.hp.com (Postfix) with ESMTP id 6291EB80B0 for ; Wed, 21 Sep 2011 12:01:57 +0100 (BST) MailScanner-NULL-Check: 1317207702.1804@zs04kzqM/lmDCG//UzNtxg Received: from [16.25.175.86] (wildhaus.hpl.hp.com [16.25.175.86]) by 0-imap-br1.hpl.hp.com (8.14.1/8.13.4) with ESMTP id p8LB1fsM025811 for ; Wed, 21 Sep 2011 12:01:41 +0100 (BST) Message-ID: <4E79C3BB.1080306@apache.org> Date: Wed, 21 Sep 2011 12:00:11 +0100 From: Steve Loughran User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.21) Gecko/20110831 Thunderbird/3.1.13 MIME-Version: 1.0 To: common-user@hadoop.apache.org Subject: Re: risks of using Hadoop References: <4E79BA8D.9050801@apache.org> <20110921123020.73895311@intec.ugent.be> In-Reply-To: <20110921123020.73895311@intec.ugent.be> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-HPL-MailScanner-Information: Please contact the ISP for more information X-MailScanner-ID: p8LB1fsM025811 X-HPL-MailScanner: Found to be clean X-HPL-MailScanner-From: stevel@apache.org On 21/09/11 11:30, Dieter Plaetinck wrote: > On Wed, 21 Sep 2011 11:21:01 +0100 > Steve Loughran wrote: > >> On 20/09/11 22:52, Michael Segel wrote: >> >>> PS... There's this junction box in your machine room that has this >>> very large on/off switch. If pulled down, it will cut power to your >>> cluster and you will lose everything. Now would you consider this a >>> risk? Sure. But is it something you should really lose sleep over? >>> Do you understand that there are risks and there are improbable >>> risks? >> >> We follow the @devops_borat Ops book and have a post-it-note on the >> switch saying "not a light switch" > > :D Also we have a backup 4-port 1Gbe linksys router for when the main switch fails. The biggest issue these days is that since we switched the backplane to Ethernet over Powerline a power outage leads to network partitioning even when the racks have UPS. see also http://twitter.com/#!/DEVOPS_BORAT