[YARN-2756] use static variable (Resources.none()) for not-running Node.resource in CommonNodeLabelsManager to save memory.

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Won't Fix
• Assignee: Zhihai Xu
• Reporter: Zhihai Xu
• Created: 27/Oct/14 23:05
• Updated: 05/May/15 00:04
• Resolved: 05/May/15 00:04

Description

use static variable (Resources.none()) for not-running Node.resource in CommonNodeLabelsManager to save memory. When a Node is not activated, the resource is never used, When a Node is activated, a new resource will be assigned to it in RMNodeLabelsManager#activateNode (nm.resource = resource) So it would be better to use static variable Resources.none() instead of allocating a new variable(Resource.newInstance(0, 0)) for each node deactivation.