Return-Path: X-Original-To: apmail-hadoop-hdfs-issues-archive@minotaur.apache.org Delivered-To: apmail-hadoop-hdfs-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 AECEA18460 for ; Wed, 19 Aug 2015 11:30:46 +0000 (UTC) Received: (qmail 29116 invoked by uid 500); 19 Aug 2015 11:30:46 -0000 Delivered-To: apmail-hadoop-hdfs-issues-archive@hadoop.apache.org Received: (qmail 29050 invoked by uid 500); 19 Aug 2015 11:30:46 -0000 Mailing-List: contact hdfs-issues-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: hdfs-issues@hadoop.apache.org Delivered-To: mailing list hdfs-issues@hadoop.apache.org Received: (qmail 29036 invoked by uid 99); 19 Aug 2015 11:30:46 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 19 Aug 2015 11:30:46 +0000 Date: Wed, 19 Aug 2015 11:30:46 +0000 (UTC) From: "Hudson (JIRA)" To: hdfs-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HDFS-8826) Balancer may not move blocks efficiently in some cases 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/HDFS-8826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14702873#comment-14702873 ] Hudson commented on HDFS-8826: ------------------------------ FAILURE: Integrated in Hadoop-Yarn-trunk #1022 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/1022/]) HDFS-8826. In Balancer, add an option to specify the source node list so that balancer only selects blocks to move from those nodes. (szetszwo: rev 7ecbfd44aa57f5f54c214b7fdedda2500be76f51) * hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt * hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/HostsFileReader.java * hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/balancer/TestBalancer.java * hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/StringUtils.java * hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Dispatcher.java * hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java > Balancer may not move blocks efficiently in some cases > ------------------------------------------------------ > > Key: HDFS-8826 > URL: https://issues.apache.org/jira/browse/HDFS-8826 > Project: Hadoop HDFS > Issue Type: Sub-task > Components: balancer & mover > Reporter: Tsz Wo Nicholas Sze > Assignee: Tsz Wo Nicholas Sze > Fix For: 2.8.0 > > Attachments: h8826_20150811.patch, h8826_20150816.patch, h8826_20150818.patch > > > Balancer is inefficient in the following case: > || Datanode || Utilization || Rack || > | D1 | 95% | A | > | D2 | 30% | B | > | D3, D4, D5 | 0% | B | > The average utilization is 25% so that D2 is within 10% threshold. However, Balancer currently will first move blocks from D2 to D3, D4 and D5 since they are under the same rack. Then, it will move blocks from D1. -- This message was sent by Atlassian JIRA (v6.3.4#6332)