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 638AE788D for ; Thu, 25 Aug 2011 09:45:00 +0000 (UTC) Received: (qmail 64571 invoked by uid 500); 25 Aug 2011 09:44:56 -0000 Delivered-To: apmail-hadoop-common-user-archive@hadoop.apache.org Received: (qmail 62964 invoked by uid 500); 25 Aug 2011 09:44:43 -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 62943 invoked by uid 99); 25 Aug 2011 09:44:37 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 25 Aug 2011 09:44:37 +0000 X-ASF-Spam-Status: No, hits=-0.0 required=5.0 tests=SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: local policy) Received: from [147.102.222.230] (HELO ulysses.noc.ntua.gr) (147.102.222.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 25 Aug 2011 09:44:29 +0000 Received: from [192.168.1.4] (adsl-62.79.107.79.tellas.gr [79.107.79.62]) (authenticated bits=0) by ulysses.noc.ntua.gr (8.14.4/8.14.4) with ESMTP id p7P9i5uf085377 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NOT); Thu, 25 Aug 2011 12:44:08 +0300 (EEST) (envelope-from gkousiou@mail.ntua.gr) Message-ID: <4E56195B.8000200@mail.ntua.gr> Date: Thu, 25 Aug 2011 12:43:55 +0300 From: George Kousiouris User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.20) Gecko/20110804 Thunderbird/3.1.12 MIME-Version: 1.0 To: "common-user@hadoop.apache.org" , common-dev@hadoop.apache.org Subject: Any related paper on how to resolve hadoop SPOF issue? Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.2.7 (ulysses.noc.ntua.gr [147.102.222.230]); Thu, 25 Aug 2011 12:44:08 +0300 (EEST) X-Virus-Scanned: clamav-milter 0.97 at ulysses.noc.ntua.gr X-Virus-Status: Clean X-Virus-Checked: Checked by ClamAV on apache.org Hi guys, We are currently in the process of writing a paper regarding hadoop and we would like to reference any attempt to remove the single point of failure of the Namenode. We have found in various presentations some efforts (like dividing the namespace between more than one namenodes if i remember correctly) but the search for a concrete paper on the issue came to nothing. Is anyone aware or has participated in such an effort? Thanks, George -- --------------------------- George Kousiouris Electrical and Computer Engineer Division of Communications, Electronics and Information Engineering School of Electrical and Computer Engineering Tel: +30 210 772 2546 Mobile: +30 6939354121 Fax: +30 210 772 2569 Email: gkousiou@mail.ntua.gr Site: http://users.ntua.gr/gkousiou/ National Technical University of Athens 9 Heroon Polytechniou str., 157 73 Zografou, Athens, Greece