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https://issues.apache.org/jira/browse/HADOOP-5513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683156#action_12683156
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Hairong Kuang commented on HADOOP-5513:
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This is not unique to Balancer. The same piece of code is used in DataNode,
Secondary Name etc, whoever needs to connect to NameNode.
> 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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