Wangda Tan created YARN-7437:
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             Summary: Give SchedulingPlacementSet to a better name.
                 Key: YARN-7437
                 URL: https://issues.apache.org/jira/browse/YARN-7437
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Wangda Tan
            Assignee: Wangda Tan
            Priority: Major


Currently, the SchedulingPlacementSet is very confusing. Here're its 
responsibilities:

1) Store ResourceRequests. (Or SchedulingRequest after YARN-6592).
2) Decide order of nodes to allocate when there're multiple node candidates.
3) Decide if we should reject node for given requests.
4) Store any states/cache can help make decision for #2/#3



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