Return-Path: Delivered-To: apmail-hadoop-core-user-archive@www.apache.org Received: (qmail 88073 invoked from network); 1 Jul 2008 11:05:01 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 1 Jul 2008 11:05:01 -0000 Received: (qmail 82086 invoked by uid 500); 1 Jul 2008 11:04:58 -0000 Delivered-To: apmail-hadoop-core-user-archive@hadoop.apache.org Received: (qmail 82057 invoked by uid 500); 1 Jul 2008 11:04:58 -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 82046 invoked by uid 99); 1 Jul 2008 11:04:58 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 01 Jul 2008 04:04:58 -0700 X-ASF-Spam-Status: No, hits=2.6 required=10.0 tests=DNS_FROM_OPENWHOIS,SPF_HELO_PASS,SPF_PASS,WHOIS_MYPRIVREG X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of lists@nabble.com designates 216.139.236.158 as permitted sender) Received: from [216.139.236.158] (HELO kuber.nabble.com) (216.139.236.158) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 01 Jul 2008 11:04:06 +0000 Received: from isper.nabble.com ([192.168.236.156]) by kuber.nabble.com with esmtp (Exim 4.63) (envelope-from ) id 1KDdes-0005ze-CF for core-user@hadoop.apache.org; Tue, 01 Jul 2008 04:04:26 -0700 Message-ID: <18213887.post@talk.nabble.com> Date: Tue, 1 Jul 2008 04:04:26 -0700 (PDT) From: novice user To: core-user@hadoop.apache.org Subject: Combiner is optional though it is specified? MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Nabble-From: pallavip.05@gmail.com X-Virus-Checked: Checked by ClamAV on apache.org Hi all, I have a query regarding the functionality of combiner. Is it possible to ignore combiner code for some of the outputs of mapper and directly being sent to reducer though combiner is specified in job configuration? Because, I figured out that, when I am running on large amounts of data, some of the mapper output is directly reached reducer. I am wondering how can this be possible when I have specified combiner in the job configuration. Can any one please let me know if this thing happens? -- View this message in context: http://www.nabble.com/Combiner-is-optional-though-it-is-specified--tp18213887p18213887.html Sent from the Hadoop core-user mailing list archive at Nabble.com.