Yufei Gu created YARN-7315:
------------------------------

             Summary: Reconsider "Public" API in SchedulingPolicy of Fair 
Scheduler 
                 Key: YARN-7315
                 URL: https://issues.apache.org/jira/browse/YARN-7315
             Project: Hadoop YARN
          Issue Type: Bug
          Components: fairscheduler
    Affects Versions: 3.1.0
            Reporter: Yufei Gu


The original intention should be to make {{SchedulingPolicy}} Public is to let 
users write their own policies. However, it shouldn't work for its all methods. 
For example, {{isChildPolicyAllowed}} and {{checkIfUsageOverFairShare}} 
shouldn't be Public API. We need to reconsider if we still want 
{{SchedulingPolicy}} to be a public API or make it private then create 
interface with less methods.



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