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https://issues.apache.org/jira/browse/HDFS-5147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756184#comment-13756184
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Konstantin Shvachko commented on HDFS-5147:
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> Also we should add an optional argument to take in the namenode hostname or 
> dfs.ha.namenodes.

This is already available with -fs generic option.

> value so the user can do admin operation on any namenode.

Very good idea. If I understand it correctly:
- If -fs is specified the command is sent to that particular NameNode. 
- And by default to the active NN.
                
> Certain dfsadmin commands such as safemode do not interact with the active 
> namenode in ha setup
> -----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5147
>                 URL: https://issues.apache.org/jira/browse/HDFS-5147
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha
>    Affects Versions: 2.1.0-beta
>            Reporter: Arpit Gupta
>            Assignee: Jing Zhao
>
> There are certain commands in dfsadmin return the status of the first 
> namenode specified in the configs rather than interacting with the active 
> namenode
> For example. Issue
> hdfs dfsadmin -safemode get
> and it will return the status of the first namenode in the configs rather 
> than the active namenode.
> I think all dfsadmin commands should determine which is the active namenode 
> do the operation on it.

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