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https://issues.apache.org/jira/browse/HADOOP-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12608778#action_12608778
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Steve Loughran commented on HADOOP-3438:
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I should add that this makes running under the debugger trickier too. This 
property should only be needed if no log dir is set in the configuration.

> NPE if job tracker started and system property hadoop.log.dir is not set
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-3438
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3438
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.18.0
>         Environment: amd64 ubuntu, jrockit 1.6
>            Reporter: Steve Loughran
>
> This is a regression. If the system property "hadoop.log.dir" is not set, the 
> job tracker NPEs rather than starts up.

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