Return-Path: Delivered-To: apmail-lucene-hadoop-dev-archive@locus.apache.org Received: (qmail 71637 invoked from network); 10 Jan 2008 19:55:58 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 10 Jan 2008 19:55:58 -0000 Received: (qmail 39518 invoked by uid 500); 10 Jan 2008 19:55:46 -0000 Delivered-To: apmail-lucene-hadoop-dev-archive@lucene.apache.org Received: (qmail 39497 invoked by uid 500); 10 Jan 2008 19:55:46 -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 39488 invoked by uid 99); 10 Jan 2008 19:55:46 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 10 Jan 2008 11:55:46 -0800 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; Thu, 10 Jan 2008 19:55:42 +0000 Received: from brutus (localhost [127.0.0.1]) by brutus.apache.org (Postfix) with ESMTP id 7AF19714233 for ; Thu, 10 Jan 2008 11:55:34 -0800 (PST) Message-ID: <2148788.1199994934499.JavaMail.jira@brutus> Date: Thu, 10 Jan 2008 11:55:34 -0800 (PST) From: "Doug Cutting (JIRA)" To: hadoop-dev@lucene.apache.org Subject: [jira] Commented: (HADOOP-2573) limit running tasks per job In-Reply-To: <26806669.1199987315087.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-2573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12557775#action_12557775 ] Doug Cutting commented on HADOOP-2573: -------------------------------------- > The limit could be max(static_limit, number of cores in cluster / # active jobs) Jinx! > limit running tasks per job > --------------------------- > > Key: HADOOP-2573 > URL: https://issues.apache.org/jira/browse/HADOOP-2573 > Project: Hadoop > Issue Type: New Feature > Components: mapred > Reporter: Doug Cutting > Fix For: 0.17.0 > > > It should be possible to specify a limit to the number of tasks per job permitted to run simultaneously. If, for example, you have a cluster of 50 nodes, with 100 map task slots and 100 reduce task slots, and the configured limit is 25 simultaneous tasks/job, then four or more jobs will be able to run at a time. This will permit short jobs to pass longer-running jobs. This also avoids some problems we've seen with HOD, where nodes are underutilized in their tail, and it should permit improved input locality. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.