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Message-ID: <32863667.10641274265654761.JavaMail.jira@thor>
Date: Wed, 19 May 2010 06:40:54 -0400 (EDT)
From: "Vinod K V (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Created: (MAPREDUCE-1799) TaskTracker webui fails to show
 logs for tasks whose child JVM itself crashes before process launch
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TaskTracker webui fails to show logs for tasks whose child JVM itself crashes before process launch
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                 Key: MAPREDUCE-1799
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1799
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: task, tasktracker
            Reporter: Vinod K V
             Fix For: 0.22.0


In many cases like invalid JVM arguments, JVM started with too much initialize heap or beyond OS ulimits, the child JVM itself crashes before the process can even be launched. In these situation, the tasktracker's webUI doesn't show the logs. This is because of a bug in the TaskLogServlet which displays logs only when syslog, stdout, stderr are all present. In the JVM crash case, syslog isn't created and so task-logs aren't displayed at all.

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