Mailing-List: contact common-issues-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: common-issues@hadoop.apache.org
Message-ID: <235316153.1251288239441.JavaMail.jira@brutus>
Date: Wed, 26 Aug 2009 05:03:59 -0700 (PDT)
From: "Steve Loughran (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-2681) NullPointerException in
 TaskRunner.java when system property "hadoop.log.dir" is not set
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


    [ 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)

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.