Anubhav Dhoot created YARN-3920:

             Summary: FairScheduler Reserving a node for a container should be 
configurable to allow it used only for large containers
                 Key: YARN-3920
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: fairscheduler
            Reporter: Anubhav Dhoot
            Assignee: Anubhav Dhoot

Reserving a node for a container was designed for preventing large containers 
from starvation from small requests that keep getting into a node. Today we let 
this be used even for a small container request. This has a huge impact on 
scheduling since we block other scheduling requests until that reservation is 
fulfilled. We should make this configurable so its impact can be minimized by 
limiting it for large container requests as originally intended. 

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