Return-Path: Delivered-To: apmail-hadoop-common-user-archive@www.apache.org Received: (qmail 20038 invoked from network); 3 Jul 2009 17:38:17 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 3 Jul 2009 17:38:17 -0000 Received: (qmail 86565 invoked by uid 500); 3 Jul 2009 17:38:26 -0000 Delivered-To: apmail-hadoop-common-user-archive@hadoop.apache.org Received: (qmail 86486 invoked by uid 500); 3 Jul 2009 17:38:25 -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 86476 invoked by uid 99); 3 Jul 2009 17:38:25 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 03 Jul 2009 17:38:25 +0000 X-ASF-Spam-Status: No, hits=3.4 required=10.0 tests=HTML_MESSAGE,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (nike.apache.org: local policy) Received: from [209.85.132.245] (HELO an-out-0708.google.com) (209.85.132.245) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 03 Jul 2009 17:38:15 +0000 Received: by an-out-0708.google.com with SMTP id c38so1126880ana.29 for ; Fri, 03 Jul 2009 10:37:54 -0700 (PDT) MIME-Version: 1.0 Received: by 10.100.38.4 with SMTP id l4mr2469344anl.189.1246642674468; Fri, 03 Jul 2009 10:37:54 -0700 (PDT) In-Reply-To: <24321039.post@talk.nabble.com> References: <24321039.post@talk.nabble.com> Date: Fri, 3 Jul 2009 10:37:54 -0700 Message-ID: <623d9cf40907031037m5fa1bc2p55b04a9a56d8f3b2@mail.gmail.com> Subject: Re: Wich is better Namenode and JobTracker run in different server or not? From: Alex Loddengaard To: common-user@hadoop.apache.org Content-Type: multipart/alternative; boundary=0016e640d3d2c60983046dd09d84 X-Virus-Checked: Checked by ClamAV on apache.org --0016e640d3d2c60983046dd09d84 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit It's unnecessary to run the NN and JT daemons on separate machines in small clusters with more than three nodes. You'll only have performance benefits by putting these daemons on separate machines if you have a large (100s of nodes) cluster. It makes sense to separate the NN and JT daemons in a three node cluster as well, assuming each node is a DataNode and TaskTracker as well. Hope this clears things up. Alex On Fri, Jul 3, 2009 at 3:37 AM, calikus wrote: > > Hi, > > I wonder which is better, Namenode and JobTracker run in different server > or > not? > > > -- > View this message in context: > http://www.nabble.com/Wich-is-better-Namenode-and-JobTracker-run-in-different-server-or-not--tp24321039p24321039.html > Sent from the Hadoop core-user mailing list archive at Nabble.com. > > --0016e640d3d2c60983046dd09d84--