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https://issues.apache.org/jira/browse/HADOOP-2681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14065448#comment-14065448
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Allen Wittenauer commented on HADOOP-2681:
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We should double-check *all* of the references to hadoop.log.dir.
HADOOP-9902 gives some guarantees that this properly set, but the Java code
should be more forgiving.
> NullPointerException in TaskRunner.java when system property "hadoop.log.dir"
> is not set
> ----------------------------------------------------------------------------------------
>
> Key: HADOOP-2681
> URL: https://issues.apache.org/jira/browse/HADOOP-2681
> Project: Hadoop Common
> Issue Type: Bug
> Components: conf
> Affects Versions: 0.15.2
> Reporter: Xu Zhang
> Priority: Minor
> Labels: newbie
>
> Currently, NullPointerException exception is thrown on line 321 in
> TaskRunner.java when system property "hadoop.log.dir" is not set. Instead of
> a NullPointerException exception, I expected a default value for
> "hadoop.log.dir" to be used, or to see a more meaningful error message that
> could have helped me figure out what was wrong (like, telling me that I
> needed to set "hadoop.log.dir" and how to do so).
> Here is one instance of such exceptions:
> WARN mapred.TaskRunner: task_200801181719_0001_m_000000_0 Child Error
> java.lang.NullPointerException
> at java.io.File.<init>(File.java:222)
> at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:321)
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