ZanderXu opened a new pull request, #4719:
URL: https://github.com/apache/hadoop/pull/4719

   ### Description of PR
   Suppose RBF cluster have 2 nameservices and to mount point as below:
   
   -  /user/ns1 -> ns1 -> /user/ns1
   - /usre/ns2 -> ns2 -> /user/ns2
   
   Suppose we disable default nameservice of the RBF cluster. If we try to get 
the file information of the path /user, RBF will throw one IOException to 
client due to can not find locations for path /user. 
   
   But as this case, RBF should should return one valid response to client, 
because /user has two sub mount point ns1 and ns2.
   


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