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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MAPREDUCE-425) NPE in TaskInProgress.cleanup
Date Wed, 29 Jul 2009 11:26:14 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-425?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amareshwari Sriramadasu resolved MAPREDUCE-425.
-----------------------------------------------

    Resolution: Duplicate

Fixed as part of HADOOP-5233

> NPE in TaskInProgress.cleanup
> -----------------------------
>
>                 Key: MAPREDUCE-425
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-425
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Steve Loughran
>            Priority: Minor
>
> This may be something that only my code triggers; an NPE in TaskTracker$TaskInProgress.cleanup
> {code}
> [sf-startdaemon-debug] 09/01/28 11:41:06 [TaskLauncher for task] INFO mapred.TaskTracker
: Error cleaning up task runner: java.lang.NullPointerException
> [sf-startdaemon-debug] 	at org.apache.hadoop.mapred.TaskTracker$TaskInProgress.cleanup(TaskTracker.java:2487)
> [sf-startdaemon-debug] 	at org.apache.hadoop.mapred.TaskTracker.startNewTask(TaskTracker.java:1825)
> [sf-startdaemon-debug] 	at org.apache.hadoop.mapred.TaskTracker.access$1100(TaskTracker.java:104)
> [sf-startdaemon-debug] 	at org.apache.hadoop.mapred.TaskTracker$TaskLauncher.run(TaskTracker.java:1779)
> {code}
> Looking at the code, the only source of NPE's on that line is localJobConf
> {code}
>   if (localJobConf.getNumTasksToExecutePerJvm() == 1) {
> {code}
> It looks like if TaskInProgress.cleanup() ever gets called with no valid localJobConf,
then an NPE is the result. The exception gets logged and discarded, but it does appear in
the logs.

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