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https://issues.apache.org/jira/browse/HDFS-3000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13240843#comment-13240843
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Tsz Wo (Nicholas), SZE commented on HDFS-3000:
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I agree with Eli that it is better to add an Admin API then adding them to 
FileSystem.  The namespace quota is quite specific to HDFS.

> I don't think it's necessarily an "administrative command" per se. At least, 
> I don't see why there's a meaningful distinction between setting quotas and, 
> say, chown.

Setting quota is pure admin method but users could use chown for changing 
groups although they cannot change owner.
                
> Add a public API for setting quotas
> -----------------------------------
>
>                 Key: HDFS-3000
>                 URL: https://issues.apache.org/jira/browse/HDFS-3000
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client
>    Affects Versions: 0.23.1
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>
> Currently one can set the quota of a file or directory from the command line, 
> but if a user wants to set it programmatically, they need to use 
> DistributedFileSystem, which is annotated InterfaceAudience.Private.

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