Tianyin Xu created HDFS-10455:
---------------------------------

             Summary: Logging the username when deny the setOwner operation
                 Key: HDFS-10455
                 URL: https://issues.apache.org/jira/browse/HDFS-10455
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.7.2
            Reporter: Tianyin Xu
            Priority: Minor
         Attachments: HDFS-10455.000.patch

The attached patch appends the user name in the logging when the setOwner 
operation is denied due to insufficient permissions on this user (based on 
his/her name). 

The same practice is used in {{FSPermissionChecker}} such as {{checkOwner()}} 
and {{checkSuperuserPrivilege()}}.

{code:title=FSDirAttrOp.java|borderStyle=solid}
       if (!pc.isSuperUser()) {
         if (username != null && !pc.getUser().equals(username)) {
-          throw new AccessControlException("Non-super user cannot change 
owner");
+          throw new AccessControlException("User " + pc.getUser()
+              + " is not a super user (non-super user cannot change owner).");
         }
         if (group != null && !pc.containsGroup(group)) {
-          throw new AccessControlException("User does not belong to " + group);
+          throw new AccessControlException("User " + pc.getUser()
+              + " does not belong to " + group);
         }

{code}




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