[YARN-8977] Remove unnecessary type casting when calling AbstractYarnScheduler#getSchedulerNode

• Type: Improvement
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Fix Version/s: 3.0.4, 3.1.2, 3.3.0, 3.2.1
• Target Version/s: 3.0.4, 3.1.2, 3.3.0, 3.2.1, 2.9.3
• Hadoop Flags: Reviewed
• Assignee: Wanqiang Ji
• Reporter: Wanqiang Ji
• Created: 06/Nov/18 10:58
• Updated: 07/Nov/18 15:04
• Resolved: 07/Nov/18 14:43

Description

Due to the AbstractYarnScheduler#getSchedulerNode method return the generic type, so I think don't need explicit type. 

I found this issue in CapacityScheduler class. The warning message like:

Casting 'getSchedulerNode( nonKillableContainer.getAllocatedNode())' to 'FiCaSchedulerNode' is redundant

Issue Links

• is caused by: YARN-5047 Refactor nodeUpdate across schedulers