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https://issues.apache.org/jira/browse/HADOOP-5513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12682746#action_12682746
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Hairong Kuang commented on HADOOP-5513:
---------------------------------------

This error can occur when you set "fs.default.name" as file:/// or hdfs:///. If 
you specify the namenode address correctly, this error won't occur.

> Balancer throws NullPointerException
> ------------------------------------
>
>                 Key: HADOOP-5513
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5513
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.20.0
>            Reporter: Ramya R
>            Priority: Minor
>             Fix For: 0.20.0
>
>
> Balancer command seems to be throwing NullPointerException when run on 0.20 
> using fairshare scheduler

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