Return-Path: Delivered-To: apmail-hadoop-mapreduce-issues-archive@minotaur.apache.org Received: (qmail 90603 invoked from network); 22 Feb 2011 02:53:03 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 22 Feb 2011 02:53:03 -0000 Received: (qmail 37402 invoked by uid 500); 22 Feb 2011 02:53:03 -0000 Delivered-To: apmail-hadoop-mapreduce-issues-archive@hadoop.apache.org Received: (qmail 37276 invoked by uid 500); 22 Feb 2011 02:53:02 -0000 Mailing-List: contact mapreduce-issues-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: mapreduce-issues@hadoop.apache.org Delivered-To: mailing list mapreduce-issues@hadoop.apache.org Received: (qmail 37268 invoked by uid 99); 22 Feb 2011 02:53:01 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 22 Feb 2011 02:53:01 +0000 X-ASF-Spam-Status: No, hits=-2000.0 required=5.0 tests=ALL_TRUSTED,T_RP_MATCHES_RCVD X-Spam-Check-By: apache.org Received: from [140.211.11.116] (HELO hel.zones.apache.org) (140.211.11.116) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 22 Feb 2011 02:52:59 +0000 Received: from hel.zones.apache.org (hel.zones.apache.org [140.211.11.116]) by hel.zones.apache.org (Postfix) with ESMTP id 7103E1B131F for ; Tue, 22 Feb 2011 02:52:38 +0000 (UTC) Date: Tue, 22 Feb 2011 02:52:38 +0000 (UTC) From: "MengWang (JIRA)" To: mapreduce-issues@hadoop.apache.org Message-ID: <372636961.7264.1298343158459.JavaMail.tomcat@hel.zones.apache.org> In-Reply-To: <347333832.5149.1298264318475.JavaMail.tomcat@hel.zones.apache.org> Subject: [jira] Commented: (MAPREDUCE-2340) optimize JobInProgress.initTasks() MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 X-Virus-Checked: Checked by ClamAV on apache.org [ https://issues.apache.org/jira/browse/MAPREDUCE-2340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12997631#comment-12997631 ] MengWang commented on MAPREDUCE-2340: ------------------------------------- Good job, thanks for Kang > optimize JobInProgress.initTasks() > ---------------------------------- > > Key: MAPREDUCE-2340 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-2340 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Components: jobtracker > Affects Versions: 0.20.1, 0.21.0 > Reporter: Kang Xiao > Attachments: MAPREDUCE-2340.patch, MAPREDUCE-2340.patch > > > JobTracker's hostnameToNodeMap cache can speed up JobInProgress.initTasks() and JobInProgress.createCache() significantly. A test for 1 job with 100000 maps on a 2400 cluster shows nearly 10 and 50 times speed up for initTasks() and createCache(). -- This message is automatically generated by JIRA. - For more information on JIRA, see: http://www.atlassian.com/software/jira