Return-Path: Delivered-To: apmail-hadoop-core-user-archive@www.apache.org Received: (qmail 69437 invoked from network); 8 Oct 2008 03:27:56 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 8 Oct 2008 03:27:56 -0000 Received: (qmail 62376 invoked by uid 500); 8 Oct 2008 03:27:50 -0000 Delivered-To: apmail-hadoop-core-user-archive@hadoop.apache.org Received: (qmail 61866 invoked by uid 500); 8 Oct 2008 03:27:49 -0000 Mailing-List: contact core-user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: core-user@hadoop.apache.org Delivered-To: mailing list core-user@hadoop.apache.org Received: (qmail 61855 invoked by uid 99); 8 Oct 2008 03:27:49 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 07 Oct 2008 20:27:49 -0700 X-ASF-Spam-Status: No, hits=2.1 required=10.0 tests=DNS_FROM_SECURITYSAGE,HTML_MESSAGE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of tkang1@gmail.com designates 209.85.200.171 as permitted sender) Received: from [209.85.200.171] (HELO wf-out-1314.google.com) (209.85.200.171) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 08 Oct 2008 03:26:47 +0000 Received: by wf-out-1314.google.com with SMTP id 24so3853482wfg.2 for ; Tue, 07 Oct 2008 20:27:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:in-reply-to:mime-version:content-type:references; bh=vVaM7EdWklShP17P4Obe4y4Exnb//0FKxQLVEuwq2s0=; b=H5xSxRnzfRCWx3ASCgYcUm+9pn06UOyboRMVB8iHEl0iX/cIdSkzeX2ilPqNEPgu3m BTlCVZYT1lijwnh+lbLhfmec/aK1pBD37v05xqSHfXSzNYZnFs+tsZ+XmGn8wXqMOuy4 B78iT/7izaI+FnJ0qm7l1qc9/lijF0lrwbYVs= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:in-reply-to:mime-version :content-type:references; b=GILz5WBSZTkdzS2os54CQoe3Qb6duFVaX9M34blGDn//4U1soF7EKxPpI8OTlaPtLm fZq1+wzDL5uwihRsMKVX5KvIKhyN7LLeUjdktecIooEc71JBmi9gbZ1LFy2xdyhnmIt9 SFrvm5OmFfD8Wc1/LIUlGhY/4mkZM6Mlhecfg= Received: by 10.142.170.6 with SMTP id s6mr3152303wfe.228.1223436443415; Tue, 07 Oct 2008 20:27:23 -0700 (PDT) Received: by 10.142.44.7 with HTTP; Tue, 7 Oct 2008 20:27:23 -0700 (PDT) Message-ID: <279a90ff0810072027g1e370c1fo2d0c34ed3c174b65@mail.gmail.com> Date: Wed, 8 Oct 2008 12:27:23 +0900 From: "Taeho Kang" To: core-user@hadoop.apache.org Subject: Re: dual core configuration In-Reply-To: <48EBCC46.8020007@casalemedia.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_81686_27053493.1223436443366" References: <19865280.post@talk.nabble.com> <19865371.post@talk.nabble.com> <48EBCC46.8020007@casalemedia.com> X-Virus-Checked: Checked by ClamAV on apache.org ------=_Part_81686_27053493.1223436443366 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline You can have your node (tasktracker) running more than 1 task simultaneously. You may set "mapred.tasktracker.map.tasks.maximum" and "mapred.tasktracker.reduce.tasks.maximum" properties found in hadoop-site.xml file. You should change hadoop-site.xml file on all your slave nodes depending on how many cores each slave has. For example, you don't really want to have 8 tasks running at once on a 2 core machine. /Taeho On Wed, Oct 8, 2008 at 5:53 AM, Elia Mazzawi wrote: > hello, > > I have some dual core nodes, and I've noticed hadoop is only running 1 > instance, and so is only using 1 on the CPU's on each node. > is there a configuration to tell it to run more than once? > or do i need to turn each machine into 2 nodes? > > Thanks. > ------=_Part_81686_27053493.1223436443366--