[jira] [Created] (HDFS-10416) Empty exception msg in the checking of superuser priviledge in DataNode

["Tianyin Xu (JIRA)" <ji...@apache.org>]

Tianyin Xu created HDFS-10416:
---------------------------------

             Summary: Empty exception msg in the checking of superuser priviledge in DataNode 
                 Key: HDFS-10416
                 URL: https://issues.apache.org/jira/browse/HDFS-10416
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode
    Affects Versions: 2.7.2
            Reporter: Tianyin Xu


In {{checkSuperuserPrivilege}} ({{DataNode.java}}), when the check fails, it throws an empty {{AccessControlException}} object which is really confusing for users to understand precisely what happened underneath the "permission denied" error.

{code:title=org.apache.hadoop.hdfs.server.datanode.DataNode|borderStyle=solid}
private void checkSuperuserPrivilege() ... {
  ...
  // Not a superuser.
  throw new AccessControlException();
}
{code}
(the method is used in a number of DataNode operations like {{refreshNamenodes}}, {{deleteBlockPool}}, {{shutdownDatanode}}, just listing a few).

\\

As the comparison, if we look at the *exactly same method* implemented for {{NameNode}}:
{code:title=org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker|borderStyle=solid}
public void checkSuperuserPrivilege() ... {
  if (!isSuperUser()) {
    throw new AccessControlException("Access denied for user "
        + getUser() + ". Superuser privilege is required");
  }
}
{code}
The message is much more clear and easier to understand.



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