Yiqun Lin commented on HDFS-13224:

[~elgoiri], the initial design and patch looks good overall. Just two comments:

1.In some RPC calls like {{setPermission}}, we do the check of 
{{(isPathAll(src)) and do the {{invokeConcurrent}}. But in some other places, 
we don't do this, any difference between these places? I mean that why we don't 
do the check \{{isPathAll(src))}} in all  Router server RPC calls. This looks a 
little confused.

2. One new order type that based on the available space in destination cluster 
may also needed. That is say, users will write files into the destination 
cluster which has the most available space.

> RBF: 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
> 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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