Return-Path: Delivered-To: apmail-hadoop-common-user-archive@www.apache.org Received: (qmail 73662 invoked from network); 15 Sep 2009 02:35:51 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 15 Sep 2009 02:35:51 -0000 Received: (qmail 50031 invoked by uid 500); 15 Sep 2009 02:35:49 -0000 Delivered-To: apmail-hadoop-common-user-archive@hadoop.apache.org Received: (qmail 49957 invoked by uid 500); 15 Sep 2009 02:35:49 -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 49947 invoked by uid 99); 15 Sep 2009 02:35:48 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 15 Sep 2009 02:35:48 +0000 X-ASF-Spam-Status: No, hits=2.2 required=10.0 tests=HTML_MESSAGE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of jason.hadoop@gmail.com designates 209.85.212.185 as permitted sender) Received: from [209.85.212.185] (HELO mail-vw0-f185.google.com) (209.85.212.185) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 15 Sep 2009 02:35:37 +0000 Received: by vws15 with SMTP id 15so2578176vws.5 for ; Mon, 14 Sep 2009 19:35:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=4PVeRnBcVH99upWSjoIdAcV2jeE0Hhq2u7Bpuwt3MKk=; b=w/AhgdsaRsfWz3aL7bfIC1peYn9dos9eK188KzE2QkpxMLvdAmB16Or0aYXp460bTi ztMduvD3Tq9LonZW7sKt5vxJFOIWqiVdW2HBrUx9DCbH5ArRuK8iKZH53tWxh7mgpuEh vLE0ydI+9KstBbrz8eYn/BIA4N9cTTm6BjEJ8= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=OkuOOy6EVNEOK6rD8X8O39uXwtJYovtzhheGFSFoooYhdJPlF1oNKeiP4Dxkvh+6/I ZQVCXTd6F87pzrbok+STtDjuH1faZPeFwCH3w1hPcrhjI4pjzNctnXy17JX6JhtDxQyL Q56DyHYVM7PUP/zdVQssFVs6g8K3wq+M5l9+U= MIME-Version: 1.0 Received: by 10.220.88.23 with SMTP id y23mr9461523vcl.94.1252982116567; Mon, 14 Sep 2009 19:35:16 -0700 (PDT) In-Reply-To: <4AAAA53E.1070407@casalemedia.com> References: <4AAAA53E.1070407@casalemedia.com> Date: Mon, 14 Sep 2009 19:35:16 -0700 Message-ID: <314098690909141935k66ca07e7i4ddbe85e86baec65@mail.gmail.com> Subject: Re: Question about mapred.child.java.opts From: Jason Venner To: common-user@hadoop.apache.org Content-Type: multipart/alternative; boundary=0016e64602a6f7cc41047394a19e X-Virus-Checked: Checked by ClamAV on apache.org --0016e64602a6f7cc41047394a19e Content-Type: text/plain; charset=ISO-8859-1 For streaming, you just need enough space to the run the child that forks and handles the streaming mapper/reducer and enough space to handle sorting the date with out the task getting stuck in GC hell. On Fri, Sep 11, 2009 at 12:30 PM, Mayuran Yogarajah < mayuran.yogarajah@casalemedia.com> wrote: > Is there any sense in setting mapred.child.java.opts to a high value > if all we're using is Hadoop streaming ? We've set it to 512MB but > I don't know if it even matters.. > > thanks > -- Pro Hadoop, a book to guide you from beginner to hadoop mastery, http://www.amazon.com/dp/1430219424?tag=jewlerymall www.prohadoopbook.com a community for Hadoop Professionals --0016e64602a6f7cc41047394a19e--