[HADOOP-6912] Guard against NPE when calling UGI.isLoginKeytabBased()

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.23.0
• Component/s: security
• Hadoop Flags: Reviewed
• Assignee: Kan Zhang
• Reporter: Kan Zhang
• Created: 10/Aug/10 21:48
• Updated: 15/Nov/11 00:50
• Resolved: 08/Mar/11 01:20

Description

NPE can happen when isLoginKeytabBased() is called before a login is performed. See MAPREDUCE-1992 for an example.

Issue Links

• relates to: MAPREDUCE-1992 NPE in JobTracker's constructor