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 9678F3178 for ; Mon, 2 May 2011 19:14:42 +0000 (UTC) Received: (qmail 42471 invoked by uid 500); 2 May 2011 19:14:42 -0000 Delivered-To: apmail-hadoop-mapreduce-issues-archive@hadoop.apache.org Received: (qmail 42400 invoked by uid 500); 2 May 2011 19:14:42 -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 42392 invoked by uid 99); 2 May 2011 19:14:42 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 02 May 2011 19:14:42 +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; Mon, 02 May 2011 19:14:41 +0000 Received: from hel.zones.apache.org (hel.zones.apache.org [140.211.11.116]) by hel.zones.apache.org (Postfix) with ESMTP id 5EE6DBE309 for ; Mon, 2 May 2011 19:14:03 +0000 (UTC) Date: Mon, 2 May 2011 19:14:03 +0000 (UTC) From: "Todd Lipcon (JIRA)" To: mapreduce-issues@hadoop.apache.org Message-ID: <845973052.15925.1304363643385.JavaMail.tomcat@hel.zones.apache.org> In-Reply-To: <1042787248.15283.1304346183327.JavaMail.tomcat@hel.zones.apache.org> Subject: [jira] [Resolved] (MAPREDUCE-2464) NullPointerException is coming in the job tracker when job tracker resends the previous heartbeat response. 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-2464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Todd Lipcon resolved MAPREDUCE-2464. ------------------------------------ Resolution: Duplicate > NullPointerException is coming in the job tracker when job tracker resends the previous heartbeat response. > ----------------------------------------------------------------------------------------------------------- > > Key: MAPREDUCE-2464 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-2464 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: jobtracker > Affects Versions: 0.23.0 > Reporter: Devaraj K > Assignee: Devaraj K > > Over the network, the heartbeat response sent by Job Tracker to Task Tracker might get lost. When Task Tracker sends the old heart beat again to Job Tracker then Job Tracker finds and ignores it saying duplicate and resends the old heartbeat response which it is maintaining in a map. If the response contains LaunchTaskAction for MapTask, then the NullPointerException is throwing. > {code:xml} > 2011-05-02 16:01:53,148 INFO org.apache.hadoop.ipc.Server: IPC Server handler 1 on 9001 caught: java.lang.NullPointerException > at org.apache.hadoop.mapred.MapTask.write(MapTask.java:140) > at org.apache.hadoop.mapred.LaunchTaskAction.write(LaunchTaskAction.java:48) > at org.apache.hadoop.mapred.HeartbeatResponse.write(HeartbeatResponse.java:91) > at org.apache.hadoop.io.ObjectWritable.writeObject(ObjectWritable.java:163) > at org.apache.hadoop.io.ObjectWritable.write(ObjectWritable.java:74) > at org.apache.hadoop.ipc.Server.setupResponse(Server.java:1561) > at org.apache.hadoop.ipc.Server.access$2800(Server.java:96) > at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1433) > {code} -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira