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 1C50611705 for ; Tue, 20 May 2014 15:38:48 +0000 (UTC) Received: (qmail 20859 invoked by uid 500); 20 May 2014 15:38:47 -0000 Delivered-To: apmail-hadoop-hdfs-issues-archive@hadoop.apache.org Received: (qmail 20818 invoked by uid 500); 20 May 2014 15:38:47 -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 20809 invoked by uid 99); 20 May 2014 15:38:47 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 20 May 2014 15:38:47 +0000 Date: Tue, 20 May 2014 15:38:47 +0000 (UTC) From: "Hudson (JIRA)" To: hdfs-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HDFS-2949) HA: Add check to active state transition to prevent operator-induced split brain 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-2949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14003474#comment-14003474 ] Hudson commented on HDFS-2949: ------------------------------ FAILURE: Integrated in Hadoop-Mapreduce-trunk #1780 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1780/]) HDFS-2949. Add check to active state transition to prevent operator-induced split brain. Contributed by Rushabh S Shah. (kihwal: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1594709) * /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/HAAdmin.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNode.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSHAAdmin.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/TestDFSHAAdmin.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/TestDFSHAAdminMiniCluster.java > HA: Add check to active state transition to prevent operator-induced split brain > -------------------------------------------------------------------------------- > > Key: HDFS-2949 > URL: https://issues.apache.org/jira/browse/HDFS-2949 > Project: Hadoop HDFS > Issue Type: Improvement > Components: ha, namenode > Affects Versions: 0.24.0 > Reporter: Todd Lipcon > Assignee: Rushabh S Shah > Fix For: 3.0.0, 2.5.0 > > Attachments: HDFS-2949-v2.patch, HDFS-2949-v3.patch, HDFS-2949.patch > > > Currently, if the administrator mistakenly calls "-transitionToActive" on one NN while the other one is still active, all hell will break loose. We can add a simple check by having the NN make a getServiceState() RPC to its peer with a short (~1 second?) timeout. If the RPC succeeds and indicates the other node is active, it should refuse to enter active mode. If the RPC fails or indicates standby, it can proceed. > This is just meant as a preventative safety check - we still expect users to use the "-failover" command which has other checks plus fencing built in. -- This message was sent by Atlassian JIRA (v6.2#6252)