Yiqun Lin commented on HDFS-13224:

[~elgoiri], thanks for updating the patch. Review comments based on v006 patch.

* #1 and #4 of my last review comments for {{TestMultipleDestinationResolver}} 
seem still need to complete in the next patch.
* Can we document the setting {{DFSConfigKeys.FEDERATION_ROUTER_PREFIX + 
"local-resolver.update-period";}} in hdfs-default.xml?

There are two part of work to do in Router Admin.

* Update the Router CLI usage and doc, add the option of DestinationOrder.
* Add some testing for Router Admin CLI, test if destination order 
added/updated correctly via Router admin commands.

> RBF: Resolvers to support mount points across multiple subclusters
> ------------------------------------------------------------------
>                 Key: HDFS-13224
>                 URL: https://issues.apache.org/jira/browse/HDFS-13224
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Íñigo Goiri
>            Assignee: Íñigo Goiri
>            Priority: Major
>         Attachments: HDFS-13224.000.patch, HDFS-13224.001.patch, 
> HDFS-13224.002.patch, HDFS-13224.003.patch, HDFS-13224.004.patch, 
> HDFS-13224.005.patch, HDFS-13224.006.patch
> Currently, a mount point points to a single subcluster. We should be able to 
> spread files in a mount point across subclusters.

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