Return-Path: X-Original-To: apmail-hadoop-user-archive@minotaur.apache.org Delivered-To: apmail-hadoop-user-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id C837AE31B for ; Thu, 17 Jan 2013 14:00:06 +0000 (UTC) Received: (qmail 36009 invoked by uid 500); 17 Jan 2013 14:00:01 -0000 Delivered-To: apmail-hadoop-user-archive@hadoop.apache.org Received: (qmail 35905 invoked by uid 500); 17 Jan 2013 14:00:01 -0000 Mailing-List: contact user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@hadoop.apache.org Delivered-To: mailing list user@hadoop.apache.org Received: (qmail 35897 invoked by uid 99); 17 Jan 2013 14:00:01 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 17 Jan 2013 14:00:01 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of dontariq@gmail.com designates 209.85.212.54 as permitted sender) Received: from [209.85.212.54] (HELO mail-vb0-f54.google.com) (209.85.212.54) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 17 Jan 2013 13:59:57 +0000 Received: by mail-vb0-f54.google.com with SMTP id l1so2505544vba.41 for ; Thu, 17 Jan 2013 05:59:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=cTJhvyFrQLImsXIndKmaQxWrjDBXSrVRZZBbmQ1D1Yw=; b=NS6Lguoe3VgBLhQu5a6StRbyHU6zn7n2GzoW3GdJaZRW3HiofZbDIA/C2hV2baaA8u R5436HwoSZebgC2cEEMVju/WegKUSqDp8fFjX6iIb5nW58Hfg2UgDdQaQQDP8G8oP+KU 9dLvdaq2/XhwOilStHg0RGvYIxN5Ezf+uJWmGLgV4+ssOZZSrrJ0ofBbJo61dgH49bRB VVtf/3+WfVnMftukr9eexTd3e9OG0ty3G5T9ybRE6lVN+d+AU8cmD/zNY0NgusO0izJJ sIlWKq6LYlJHMAvuXBMNXfHGvk+nYb0+8C4y3jq417QDFm8atOKhvkZADE6rc9OCX8xu 4dFA== X-Received: by 10.52.156.7 with SMTP id wa7mr4769549vdb.46.1358431176528; Thu, 17 Jan 2013 05:59:36 -0800 (PST) MIME-Version: 1.0 Received: by 10.58.34.16 with HTTP; Thu, 17 Jan 2013 05:58:56 -0800 (PST) In-Reply-To: <50F802B2.9050008@talend.com> References: <50F802B2.9050008@talend.com> From: Mohammad Tariq Date: Thu, 17 Jan 2013 19:28:56 +0530 Message-ID: Subject: Re: DFS filesystem used for Standalone and Pseudo-Distributed operation To: "user@hadoop.apache.org" Content-Type: multipart/alternative; boundary=bcaec53aec04ba92ce04d37c6726 X-Virus-Checked: Checked by ClamAV on apache.org --bcaec53aec04ba92ce04d37c6726 Content-Type: text/plain; charset=ISO-8859-1 Hello Glen, Pl find my comments embedded below : 1.) The Standalone Operation (http://hadoop.apache.org/** docs/r1.1.1/single_node_setup.**html#Local), just to confirm, can run without any DFS filesystem? (We're not being asked to run "bin/hadoop namenode -format" for it.) >>Yes. You don't need HDFS for this. 2.) For Pseudo-Distributed Operation (http://hadoop.apache.org/** docs/r1.1.1/single_node_setup.**html#PseudoDistributed), where we are instructed to run "bin/hadoop namenode -format", question: how do I undo whatever that command does? I.e., how do I delete that distributed file system created as well as remove from Hadoop any knowledge of its prior existence -- do I have to manually delete files with OS commands (what do I remove?) or is there some type of "bin/hadoop namenode -delete" command that undoes the "-format" command? >>You can reformat the NameNode or manually delete the directories holding the data and the metadata. Warm Regards, Tariq https://mtariq.jux.com/ cloudfront.blogspot.com On Thu, Jan 17, 2013 at 7:24 PM, Glen Mazza wrote: > Hi, I'm following the Hadoop 1.1.1 tutorial (http://hadoop.apache.org/** > docs/r1.1.1/single_node_setup.**html) > and I have these questions: > > 1.) The Standalone Operation (http://hadoop.apache.org/** > docs/r1.1.1/single_node_setup.**html#Local), > just to confirm, can run without any DFS filesystem? (We're not being > asked to run "bin/hadoop namenode -format" for it.) > > 2.) For Pseudo-Distributed Operation (http://hadoop.apache.org/** > docs/r1.1.1/single_node_setup.**html#PseudoDistributed), > where we are instructed to run "bin/hadoop namenode -format", question: how > do I undo whatever that command does? I.e., how do I delete that > distributed file system created as well as remove from Hadoop any knowledge > of its prior existence -- do I have to manually delete files with OS > commands (what do I remove?) or is there some type of "bin/hadoop namenode > -delete" command that undoes the "-format" command? > > Thanks, > Glen > > -- > Glen Mazza > Talend Community Coders - coders.talend.com > blog: www.jroller.com/gmazza > > --bcaec53aec04ba92ce04d37c6726 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Hello Glen,

=A0 =A0 =A0Pl find my= comments embedded below :

1.) The Standalone Operati= on (http://hadoop.apache.org/docs/r1.1.1/single_node_setup.html#Local), just to confirm, can run without any DFS filesystem? =A0(We're n= ot being asked to run "bin/hadoop namenode -format" for it.)
>>Yes. You don't need HDFS for this.


2.) For Pseudo-Distributed Opera= tion (http://hadoop.apache.org/docs/r1.1.1/single= _node_setup.html#PseudoDistributed), where we are instructed to run "bin/h= adoop namenode -format", question: how do I undo whatever that command= does? =A0I.e., how do I delete that distributed file system created as wel= l as remove from Hadoop any knowledge of its prior existence -- do I have t= o manually delete files with OS commands (what do I remove?) or is there so= me type of "bin/hadoop namenode -delete" command that undoes the = "-format" command?
>>You can reformat the NameNode or manually delete the direc= tories holding the data and the metadata.

Warm Regards,
Tariq
<= a href=3D"https://mtariq.jux.com/" target=3D"_blank">https://mtariq.jux.com= /


On Thu, Jan 17, 2013 at 7:24 PM, Glen Ma= zza <gmazza@talend.com> wrote:
Hi, I'm following the Hadoop 1.1.1 tutorial (http://hado= op.apache.org/docs/r1.1.1/single_node_setup.html) and I h= ave these questions:

1.) The Standalone Operation (http://hadoop.apache.org= /docs/r1.1.1/single_node_setup.html#Local), just to confi= rm, can run without any DFS filesystem? =A0(We're not being asked to ru= n "bin/hadoop namenode -format" for it.)

2.) For Pseudo-Distributed Operation (http= ://hadoop.apache.org/docs/r1.1.1/single_node_setup.html#Pseud= oDistributed), where we are instructed to run "bin/hadoop namenode= -format", question: how do I undo whatever that command does? =A0I.e.= , how do I delete that distributed file system created as well as remove fr= om Hadoop any knowledge of its prior existence -- do I have to manually del= ete files with OS commands (what do I remove?) or is there some type of &qu= ot;bin/hadoop namenode -delete" command that undoes the "-format&= quot; command?

Thanks,
Glen

--
Glen Mazza
Talend Community Coders - coders.talend.com
blog: www.jroll= er.com/gmazza


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