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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