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https://issues.apache.org/jira/browse/HDFS-13655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16592424#comment-16592424
 ] 

Yiqun Lin commented on HDFS-13655:
----------------------------------

I'm also a little worried about the current JIRA numbers. I take a quick glance 
of recent RBF JIRAs. There are not only error handling of the Router admin, 
also have others following:

* HDFS-13845:The default MountTableResolver cannot get multi-destination path 
for the DestinationOrder
* HDFS-13841: After Click on another Tab in Router Federation UI page it's not 
redirecting to new tab
* HDFS-13835: RBF: Unable to add files after changing the order
* HDFS-13852: RBF: The DN_REPORT_TIME_OUT and DN_REPORT_CACHE_EXPIRE should be 
configured in RBFConfigKeys.
* HDFS-13802: RBF: Remove FSCK from Router Web UI, because fsck is not 
supported currently

For the critical issues, we can directly merge to trunk. For most of others 
(not critical issues), I prefer to merge these JIRAs in the same branch and 
make the branch stabilised. 
So the new branch will focus on:

* ClientProtocol APIs implementation to RBF
* Router admin error handling improvments
* Other improvements(e.g. setting configurable, normal bug fixes)

One thing I'm sure, it's not appropriate to directly merge these all to trunk 
now. 

> 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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