umamaheswararao commented on pull request #2185:
URL: https://github.com/apache/hadoop/pull/2185#issuecomment-685957079


   Hi @JohnZZGithub, I got few other points to discuss.
   1. We have exposed getMountPoints API. It seems we can't return any mount 
points from REGEX based because you would not know until you got src paths to 
resolve and find real target fs. What should we do for this API? 
   2. Other API is getDelegationTokenIssuers. Applications like YARN uses this 
API to get all child fs delegation tokens. This also will not work for REGEX 
based mount points.
   3. Other question is how this child filesystem objects gets closed. There 
was an issue with [ViewFileSystem#close | 
https://issues.apache.org/jira/browse/HADOOP-15565 ]. I would like to know how 
that get addressed in this case as don't keep anything in InnerCache.
   Sorry for bringing this points late, but they just got popped up in my mind. 
   


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