[YARN-6081] LeafQueue#getTotalPendingResourcesConsideringUserLimit should deduct reserved from pending to avoid unnecessary preemption of reserved container

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 2.9.0, 3.0.0-alpha2
• Target Version/s: 2.8.0, 2.9.0, 3.0.0-alpha2
• Hadoop Flags: Reviewed
• Assignee: Wangda Tan
• Reporter: Wangda Tan
• Created: 11/Jan/17 03:06
• Updated: 14/Oct/19 15:38
• Resolved: 13/Jan/17 13:02

Description

While doing YARN-5864 tests, found an issue when a queue's reserved > pending. PreemptionResourceCalculator will preempt reserved container even if there's only one active queue in the cluster.

To fix the problem, we need to deduct reserved from pending when getting total-pending resource for LeafQueue