Return-Path: X-Original-To: apmail-hadoop-mapreduce-dev-archive@minotaur.apache.org Delivered-To: apmail-hadoop-mapreduce-dev-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 461A2C8DD for ; Mon, 30 Jul 2012 18:47:49 +0000 (UTC) Received: (qmail 96472 invoked by uid 500); 30 Jul 2012 18:47:47 -0000 Delivered-To: apmail-hadoop-mapreduce-dev-archive@hadoop.apache.org Received: (qmail 96418 invoked by uid 500); 30 Jul 2012 18:47:47 -0000 Mailing-List: contact mapreduce-dev-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: mapreduce-dev@hadoop.apache.org Delivered-To: mailing list mapreduce-dev@hadoop.apache.org Received: (qmail 96402 invoked by uid 99); 30 Jul 2012 18:47:46 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 30 Jul 2012 18:47:46 +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 mylinqiao@gmail.com designates 209.85.213.176 as permitted sender) Received: from [209.85.213.176] (HELO mail-yx0-f176.google.com) (209.85.213.176) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 30 Jul 2012 18:47:40 +0000 Received: by yenl5 with SMTP id l5so5888890yen.35 for ; Mon, 30 Jul 2012 11:47:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=JOSZzsBQvqxG30OoN5pkADuc4qPvGoIQ8feuEMr4oX8=; b=MVBGWEQLnRRgugjF/xUDHtvzRT1sKImL5xet0kfge2TOWodd2i4819o6y5fQjWpv3e axfHMIN1q253zE7jOajlacTfMhhIU44qS1i2kzKHYJGfBqX2arxc7i04hi+Cst1yi0w8 IkJM4mpGjf95uiKxEEWiP5R+6lEa6iV5hDMXrPbh0v+7irDNDBJ6MbZd+x1h9iGPJF+S lzZBwUAvJja36F5P2m1XDmzCdvbI08qv3L0yp1gdlPK3yHW3bf9VYpAf161Ounq8w3IJ snyscUvv8btKhZHujaot0h7BGSxG7cIdXlsG3LvTsmOanVbAhuqrhtYOnZ6bN7bwz4xZ GIjQ== MIME-Version: 1.0 Received: by 10.50.34.195 with SMTP id b3mr11934041igj.47.1343674039462; Mon, 30 Jul 2012 11:47:19 -0700 (PDT) Received: by 10.50.134.97 with HTTP; Mon, 30 Jul 2012 11:47:19 -0700 (PDT) Date: Mon, 30 Jul 2012 11:47:19 -0700 Message-ID: Subject: output/input ratio > 1 for map tasks? From: brisk To: mapreduce-user@hadoop.apache.org, mapreduce-dev@hadoop.apache.org Content-Type: multipart/alternative; boundary=14dae9340fb1d0e96a04c6107d49 X-Virus-Checked: Checked by ClamAV on apache.org --14dae9340fb1d0e96a04c6107d49 Content-Type: text/plain; charset=ISO-8859-1 Hi, Does anybody know if there are some cases where the output/input ratio for map tasks is larger than 1? I can just think of for the sort, it's 1 and for the search job it's usually smaller than 1... Thanks, Ethan --14dae9340fb1d0e96a04c6107d49--