Mikhail Erofeev created HDFS-12292:
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             Summary: Federation: Support viewfs:// schema path for DfsAmdin 
commands
                 Key: HDFS-12292
                 URL: https://issues.apache.org/jira/browse/HDFS-12292
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: federation
            Reporter: Mikhail Erofeev
            Assignee: Mikhail Erofeev


Motivation:
As of now, clients need to specify a nameservice when a cluster is federated, 
otherwise, the exception is fired:

{code}
 hdfs dfsadmin -setQuota 10 viewfs://vfs-root/user/uname
setQuota: FileSystem viewfs://vfs-root/ is not an HDFS file system

# with fs.defaultFS = viewfs://vfs-root/
 hdfs dfsadmin -setQuota 10 vfs-root/user/uname
setQuota: FileSystem viewfs://vfs-root/ is not an HDFS file system

# works fine thanks to https://issues.apache.org/jira/browse/HDFS-11432
#  hdfs dfsadmin -setQuota 10 hdfs://users-fs/user/uname
{code}

This creates inconvenience, inability to rely on fs.defaultFS and forces to 
create client-side mappings for management scripts

Implementation:
PathData that is passed to commands should be resolved to its actual FileSystem

Result:
ViewFS will be resolved to the actual HDFS file system



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