omalley commented on a change in pull request #4081:
URL: https://github.com/apache/hadoop/pull/4081#discussion_r830309182



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java
##########
@@ -1899,7 +1907,27 @@ private void verifySoftwareVersion(DatanodeRegistration 
dnReg)
     }
   }
 
-  private static String getClientMachine() {
+  private String getClientMachine() {
+    if (ipProxyUsers != null) {
+      // Get the real user (or effective if it isn't a proxy user)
+      UserGroupInformation user = Server.getRemoteUser().getRealUserOrSelf();

Review comment:
       Nice catch, thank you.




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