Return-Path: X-Original-To: apmail-hadoop-common-issues-archive@minotaur.apache.org Delivered-To: apmail-hadoop-common-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 40028E2F2 for ; Fri, 1 Feb 2013 17:40:13 +0000 (UTC) Received: (qmail 1990 invoked by uid 500); 1 Feb 2013 17:40:12 -0000 Delivered-To: apmail-hadoop-common-issues-archive@hadoop.apache.org Received: (qmail 1959 invoked by uid 500); 1 Feb 2013 17:40:12 -0000 Mailing-List: contact common-issues-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: common-issues@hadoop.apache.org Delivered-To: mailing list common-issues@hadoop.apache.org Received: (qmail 1950 invoked by uid 99); 1 Feb 2013 17:40:12 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 01 Feb 2013 17:40:12 +0000 Date: Fri, 1 Feb 2013 17:40:12 +0000 (UTC) From: "Suresh Srinivas (JIRA)" To: common-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (HADOOP-9275) ActiveStandbyElector can join election even before Service HEALTHY, and results in null data at ActiveBreadCrumb 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/HADOOP-9275?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Suresh Srinivas updated HADOOP-9275: ------------------------------------ Component/s: ha > ActiveStandbyElector can join election even before Service HEALTHY, and results in null data at ActiveBreadCrumb > ---------------------------------------------------------------------------------------------------------------- > > Key: HADOOP-9275 > URL: https://issues.apache.org/jira/browse/HADOOP-9275 > Project: Hadoop Common > Issue Type: Bug > Components: ha > Affects Versions: 2.0.2-alpha > Reporter: Vinay > Assignee: Vinay > > ActiveStandbyElector can store null at ActiveBreadCrumb in the below race condition. At further all failovers will fail resulting NPE. > 1. ZKFC restarted. > 2. due to less machine busy, first zk connection is expired even before the health monitoring returned the status. > 3. On re-establishment transitionToActive will be called, at this time appData will be null, > 4. So now ActiveBreadCrumb will have null. > 5. After this any failovers will fail throwing > {noformat}java.lang.NullPointerException > at org.apache.hadoop.util.StringUtils.byteToHexString(StringUtils.java:171) > at org.apache.hadoop.ha.ActiveStandbyElector.fenceOldActive(ActiveStandbyElector.java:892) > at org.apache.hadoop.ha.ActiveStandbyElector.becomeActive(ActiveStandbyElector.java:797) > at org.apache.hadoop.ha.ActiveStandbyElector.processResult(ActiveStandbyElector.java:475) > at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:545) > at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:497){noformat} > Should not join the election before service is HEALTHY -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira