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https://issues.apache.org/jira/browse/HDFS-13655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16567135#comment-16567135
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Xiao Chen commented on HDFS-13655:
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Thanks all for the work here!

My apologies if this is already done and I missed it - I have only done very 
preliminary search - there are also some dfsadmin commands that need 
integration. For example, -safemode / -saveNamespace / -rollingUpgrade etc. 
This will also be a little different than the listing commands, in that these 
are probably targeted to one of the nameservice. 

> RBF: Add missing ClientProtocol APIs to RBF
> -------------------------------------------
>
>                 Key: HDFS-13655
>                 URL: https://issues.apache.org/jira/browse/HDFS-13655
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Xiao Chen
>            Priority: Major
>
> As 
> [discussed|https://issues.apache.org/jira/browse/HDFS-12858?focusedCommentId=16500975&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16500975|#comment-16500975]
>  with [~elgoiri], there are some HDFS methods that does not take path as a 
> parameter. We should support these to work with federation.
> The ones missing are:
>  * Snapshots
>  * Storage policies
>  * Encryption zones
>  * Cache pools
> One way to reasonably have them to work with federation is to 'list' each 
> nameservice and concat the results. This can be done pretty much the same as 
> {{refreshNodes()}} and it would be a matter of querying all the subclusters 
> and aggregate the output (e.g., {{getDatanodeReport()}}.)



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