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https://issues.apache.org/jira/browse/HADOOP-5234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672984#action_12672984
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Steve Loughran commented on HADOOP-5234:
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I'd been seeing an NPE in this code too, but assumed it was something I'd been
doing, so was adding various checks based on the hypothesis that it was the
directoryCleanupThread that was null -but that didn't make it go away. If
either of localJobConf or defaultJobConf were null, I'd expect to see stack
traces somewhere round here.
> NPE in TaskTracker reinit action
> --------------------------------
>
> Key: HADOOP-5234
> URL: https://issues.apache.org/jira/browse/HADOOP-5234
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Amareshwari Sriramadasu
> Priority: Critical
>
> I have seen an NPE in TT reinit action.
> TT logs :
> {noformat}
> 2009-02-12 12:14:02,859 INFO org.apache.hadoop.mapred.TaskTracker: Error
> cleaning up task runner: java.lang.NullPointerException
> at
> org.apache.hadoop.mapred.TaskTracker$TaskInProgress.cleanup(TaskTracker.java:2515)
> at
> org.apache.hadoop.mapred.TaskTracker$TaskInProgress.jobHasFinished(TaskTracker.java:2381)
> at org.apache.hadoop.mapred.TaskTracker.close(TaskTracker.java:925)
> at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:1830)
> at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:2901)
> {noformat}
> corresponding code is
> {noformat}
> 2515 if (localJobConf.getNumTasksToExecutePerJvm() == 1) {
> {noformat}
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