[HADOOP-9748] Reduce blocking on UGI.ensureInitialized

• Type: Sub-task
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.23.0, 2.0.0-alpha, 3.0.0-alpha1
• Fix Version/s: 0.23.10, 2.3.0
• Component/s: security
• Target Version/s: 0.23.10
• Hadoop Flags: Reviewed
• Assignee: Daryn Sharp
• Reporter: Daryn Sharp
• Created: 18/Jul/13 17:40
• Updated: 12/May/16 18:27
• Resolved: 19/Jul/13 14:08

Description

EnsureInitialized is always sync'ed on the class, when it should only sync if it actually has to initialize.

Issue Links

• breaks: HADOOP-10487 Racy code in UserGroupInformation#ensureInitialized()