[HDFS-16259] Catch and re-throw sub-classes of AccessControlException thrown by any permission provider plugins (eg Ranger)

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.4.0, 3.3.2
• Component/s: namenode
• Labels: pull-request-available
• Assignee: Stephen O'Donnell
• Reporter: Stephen O'Donnell
• Created: 06/Oct/21 09:16
• Updated: 02/Nov/21 21:44
• Resolved: 02/Nov/21 11:45

Description

When a permission provider plugin is enabled (eg Ranger) there are some scenarios where it can throw a sub-class of an AccessControlException (eg RangerAccessControlException). If this exception is allowed to propagate up the stack, it can give problems in the HDFS Client, when it unwraps the remote exception containing the AccessControlException sub-class.

Ideally, we should make AccessControlException final so it cannot be sub-classed, but that would be a breaking change at this point. Therefore I believe the safest thing to do, is to catch any AccessControlException that comes out of the permission enforcer plugin, and re-throw an AccessControlException instead.

Issue Links

• links to: GitHub Pull Request #3598