[YARN-2925] Internal fields in LeafQueue access should be protected when accessed from FiCaSchedulerApp to calculate Headroom

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Duplicate
• Component/s: capacityscheduler
• Target Version/s: 2.8.0
• Assignee: Wangda Tan
• Reporter: Wangda Tan
• Created: 05/Dec/14 01:21
• Updated: 01/May/15 22:32
• Resolved: 01/May/15 22:32

Description

Upon YARN-2644, FiCaScheduler will calculation up-to-date headroom before sending back Allocation response to AM.

Headroom calculation is happened in LeafQueue side, uses fields like used resource, etc. But it is not protected by any lock of LeafQueue, so it might be corrupted is someone else is editing it.