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https://issues.apache.org/jira/browse/HADOOP-5513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683160#action_12683160
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Hairong Kuang commented on HADOOP-5513:
---------------------------------------

Nigel, I am not saying that throwing NullPointerException at the command line 
is not a bug. But what I am trying to figure out is if this is a blocker to 
0.20. The answer is no if the error was introduced by a wrong 
setup/configuration.

> 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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