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https://issues.apache.org/jira/browse/HADOOP-2716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565486#action_12565486
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Hairong Kuang commented on HADOOP-2716:
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I think it still makes sense to have a getProxy mehthod that takes a UGI 
parameter for the performance purpose. If the user-supplied ugi is null,, then 
do an automatic login. The getProxy method without the UGI paramter calls this 
method directly with a null UGI as input.

> Balancer should require superuser privilege
> -------------------------------------------
>
>                 Key: HADOOP-2716
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2716
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>             Fix For: 0.16.1
>
>         Attachments: 2716_20080125.patch, 2716_20080202.patch
>
>
> Balancer uses NamenodeProtocol.  Currently, there is no permission checking 
> for NamenodeProtocol.  We should require superuser privilege for running 
> Balancer.

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