Shen Yinjie created HDFS-14447:
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             Summary: RBF:RouterAdminServer should support 
RefreshUserMappingsProtocol
                 Key: HDFS-14447
                 URL: https://issues.apache.org/jira/browse/HDFS-14447
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: rbf
    Affects Versions: 3.1.0
            Reporter: Shen Yinjie


HDFS with RBF
We configure hadoop.proxyuser.xx.yy ,then execute hdfs dfsadmin 
-Dfs.defaultFS=hdfs://router-fed -refreshSuperUserGroupsConfiguration,
 it throws "Unknown protocol: ...RefreshUserMappingProtocol".

RouterAdminServer should support RefreshUserMappingsProtocol , or a proxyuser 
client would be refused to impersonate.



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