Return-Path: Delivered-To: apmail-hadoop-hdfs-dev-archive@minotaur.apache.org Received: (qmail 72217 invoked from network); 28 Sep 2010 09:54:24 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 28 Sep 2010 09:54:24 -0000 Received: (qmail 57472 invoked by uid 500); 28 Sep 2010 09:54:24 -0000 Delivered-To: apmail-hadoop-hdfs-dev-archive@hadoop.apache.org Received: (qmail 57094 invoked by uid 500); 28 Sep 2010 09:54:20 -0000 Mailing-List: contact hdfs-dev-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: hdfs-dev@hadoop.apache.org Delivered-To: mailing list hdfs-dev@hadoop.apache.org Received: (qmail 57085 invoked by uid 99); 28 Sep 2010 09:54:19 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 28 Sep 2010 09:54:19 +0000 X-ASF-Spam-Status: No, hits=2.9 required=10.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (nike.apache.org: local policy) Received: from [74.125.82.176] (HELO mail-wy0-f176.google.com) (74.125.82.176) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 28 Sep 2010 09:54:12 +0000 Received: by wyb34 with SMTP id 34so7038090wyb.35 for ; Tue, 28 Sep 2010 02:53:51 -0700 (PDT) MIME-Version: 1.0 Received: by 10.216.157.13 with SMTP id n13mr7455852wek.35.1285667631186; Tue, 28 Sep 2010 02:53:51 -0700 (PDT) Received: by 10.216.165.203 with HTTP; Tue, 28 Sep 2010 02:53:51 -0700 (PDT) In-Reply-To: References: Date: Tue, 28 Sep 2010 02:53:51 -0700 Message-ID: Subject: Re: namenode crash - recovery model? From: Jeff Hammerbacher To: hdfs-dev@hadoop.apache.org Content-Type: multipart/alternative; boundary=0016e6570e9674c2a904914ed2d4 X-Virus-Checked: Checked by ClamAV on apache.org --0016e6570e9674c2a904914ed2d4 Content-Type: text/plain; charset=ISO-8859-1 Hey John, See https://issues.apache.org/jira/browse/HDFS-1064 for the JIRA where high availability strategies for the NameNode are discussed. Thanks, Jeff On Mon, Sep 13, 2010 at 2:33 PM, John Hui wrote: > Hi All, > > I am new to Hadoop. I have been reading and playing around with Hadoop, it > seems like the namenode is a single point of failure. I read about the > backup node which is basically a copy of the live namenode. > > So if the namenode were to crash, what is some of the recovery model that > people have in place. Is there a way to configure hadoop to flip the the > backup node and use that as the primary name node if the primary namenode > goes down.. > > Thanks in advance, > > John > --0016e6570e9674c2a904914ed2d4--