[YARN-6245] Add FinalResource object to reduce overhead of Resource class instancing

• Type: Sub-task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Assignee: Unassigned
• Reporter: Wangda Tan
• Created: 27/Feb/17 22:03
• Updated: 01/Jun/17 16:26

Description

There're lots of Resource object creation in YARN Scheduler, since Resource object is backed by protobuf, creation of such objects is expensive and becomes bottleneck.

To address the problem, we can introduce a FinalResource (Is it better to call it ImmutableResource?) object, which is not backed by PBImpl. We can use this object in frequent invoke paths in the scheduler.