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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2681) NullPointerException in TaskRunner.java when system property "hadoop.log.dir" is not set
Date Wed, 26 Aug 2009 12:03:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747906#action_12747906
] 

Steve Loughran commented on HADOOP-2681:
----------------------------------------

This problem still exists in 0.21 code,  not at line 401

    // Setup the log4j prop
    vargs.add("-Dhadoop.log.dir=" + 
        new File(System.getProperty("hadoop.log.dir")
        ).getAbsolutePath());

The value of hadoop.log.dir should be driven by the configuration, not a system property.
That system property could be an default, but it should be sufficient for a value in the configuration
to be defined.

> 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
>
> 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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