Return-Path: Delivered-To: apmail-lucene-hadoop-dev-archive@locus.apache.org Received: (qmail 54608 invoked from network); 3 Apr 2007 03:17:59 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 3 Apr 2007 03:17:59 -0000 Received: (qmail 47138 invoked by uid 500); 3 Apr 2007 03:18:01 -0000 Delivered-To: apmail-lucene-hadoop-dev-archive@lucene.apache.org Received: (qmail 47065 invoked by uid 500); 3 Apr 2007 03:18:01 -0000 Mailing-List: contact hadoop-dev-help@lucene.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: hadoop-dev@lucene.apache.org Delivered-To: mailing list hadoop-dev@lucene.apache.org Received: (qmail 46953 invoked by uid 99); 3 Apr 2007 03:18:00 -0000 Received: from herse.apache.org (HELO herse.apache.org) (140.211.11.133) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 02 Apr 2007 20:18:00 -0700 X-ASF-Spam-Status: No, hits=-100.0 required=10.0 tests=ALL_TRUSTED X-Spam-Check-By: apache.org Received: from [140.211.11.4] (HELO brutus.apache.org) (140.211.11.4) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 02 Apr 2007 20:17:52 -0700 Received: from brutus (localhost [127.0.0.1]) by brutus.apache.org (Postfix) with ESMTP id 8F322714068 for ; Mon, 2 Apr 2007 20:17:32 -0700 (PDT) Message-ID: <31135345.1175570252583.JavaMail.jira@brutus> Date: Mon, 2 Apr 2007 20:17:32 -0700 (PDT) From: "Arun C Murthy (JIRA)" To: hadoop-dev@lucene.apache.org Subject: [jira] Commented: (HADOOP-1194) map output should not do block level compression In-Reply-To: <4968680.1175560052263.JavaMail.jira@brutus> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Virus-Checked: Checked by ClamAV on apache.org [ https://issues.apache.org/jira/browse/HADOOP-1194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12486213 ] Arun C Murthy commented on HADOOP-1194: --------------------------------------- Runping, 'mapred.compress.map.output' is the boolean which controls whether map outputs are compressed. If set to true (@see MapTask.java:279) the 'mapred.output.compression.type' can be used to specify RECORD/BLOCK - this defaults to SequenceFile's compression-type i.e. 'io.seqfile.compression.type' which defaults to RECORD compression. (@see JobConf.getMapOutputCompressionType). Does this help? Or do you propose we change JobConf.getMapOutputCompressionType to return RECORD if 'mapred.output.compression.type' is unset i.e. do not use io.seqfile.compression.type? Thanks for the clarification... > map output should not do block level compression > ------------------------------------------------ > > Key: HADOOP-1194 > URL: https://issues.apache.org/jira/browse/HADOOP-1194 > Project: Hadoop > Issue Type: Bug > Components: mapred > Affects Versions: 0.12.2 > Reporter: Runping Qi > > If the user sets to compress the map output, the compression style should be record level, not block level, since using block level compression for map outputs causes performance degragation significantly. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.