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https://issues.apache.org/jira/browse/HADOOP-5513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683382#action_12683382
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Iyappan Srinivasan commented on HADOOP-5513:
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The fs.default.name property should be mentioned in core-site.xml and not in
hdfs-site.xml. If it is mentioned there, then this nullPointer exception wont
occur.
Since balancer balances the namenode, it looks for namenode information under
core-site.xml. if it is not able to find it it gives NullPointer Exception.
I tested to make sure of this.
> 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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