Return-Path: X-Original-To: apmail-hadoop-mapreduce-issues-archive@minotaur.apache.org Delivered-To: apmail-hadoop-mapreduce-issues-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id D80DF18174 for ; Fri, 16 Oct 2015 17:27:08 +0000 (UTC) Received: (qmail 47898 invoked by uid 500); 16 Oct 2015 17:27:08 -0000 Delivered-To: apmail-hadoop-mapreduce-issues-archive@hadoop.apache.org Received: (qmail 47837 invoked by uid 500); 16 Oct 2015 17:27:08 -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 47824 invoked by uid 99); 16 Oct 2015 17:27:08 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 16 Oct 2015 17:27:08 +0000 Date: Fri, 16 Oct 2015 17:27:08 +0000 (UTC) From: "Wangda Tan (JIRA)" To: mapreduce-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (MAPREDUCE-6302) Preempt reducers after a configurable timeout irrespective of headroom MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/MAPREDUCE-6302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14961050#comment-14961050 ] Wangda Tan commented on MAPREDUCE-6302: --------------------------------------- +1 to backport this issue to 2.6.x and 2.7.x > Preempt reducers after a configurable timeout irrespective of headroom > ---------------------------------------------------------------------- > > Key: MAPREDUCE-6302 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-6302 > Project: Hadoop Map/Reduce > Issue Type: Bug > Affects Versions: 2.6.0 > Reporter: mai shurong > Assignee: Karthik Kambatla > Priority: Critical > Fix For: 2.8.0 > > Attachments: AM_log_head100000.txt.gz, AM_log_tail100000.txt.gz, log.txt, mr-6302-1.patch, mr-6302-2.patch, mr-6302-3.patch, mr-6302-4.patch, mr-6302-5.patch, mr-6302-6.patch, mr-6302-7.patch, mr-6302-prelim.patch, mr-6302_branch-2.patch, queue_with_max163cores.png, queue_with_max263cores.png, queue_with_max333cores.png > > > I submit a big job, which has 500 maps and 350 reduce, to a queue(fairscheduler) with 300 max cores. When the big mapreduce job is running 100% maps, the 300 reduces have occupied 300 max cores in the queue. And then, a map fails and retry, waiting for a core, while the 300 reduces are waiting for failed map to finish. So a deadlock occur. As a result, the job is blocked, and the later job in the queue cannot run because no available cores in the queue. > I think there is the similar issue for memory of a queue . -- This message was sent by Atlassian JIRA (v6.3.4#6332)