[HADOOP-7854] UGI getCurrentUser is not synchronized

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.0.0
• Fix Version/s: 1.0.0, 0.23.1
• Component/s: security
• Target Version/s: 1.0.0, 0.23.1
• Assignee: Daryn Sharp
• Reporter: Daryn Sharp
• Created: 23/Nov/11 18:13
• Updated: 28/Dec/11 10:03
• Resolved: 01/Dec/11 01:22

Description

Sporadic ConcurrentModificationExceptions are originating from UGI.getCurrentUser when it needs to create a new instance. The problem was specifically observed in a JT under heavy load when a post-job cleanup is accessing the UGI while a new job is being processed.