Fengnan Li created HDFS-15554:
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             Summary: RBF: force router check file existence before 
adding/updating mount points
                 Key: HDFS-15554
                 URL: https://issues.apache.org/jira/browse/HDFS-15554
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Fengnan Li
            Assignee: Fengnan Li


Adding/Updating mount points right now is only a router action without 
validation in the downstream namenodes for the destination files/directories.

In practice we have set up the dangling mount points and when clients call 
listStatus they would get the file returned, but then if they try to access the 
file FileNotFoundException would be thrown out.



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