Wangda Tan created YARN-7920:
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             Summary: Cleanup configuration of PlacementConstraints
                 Key: YARN-7920
                 URL: https://issues.apache.org/jira/browse/YARN-7920
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Wangda Tan
            Assignee: Wangda Tan


Currently it is very confusing to have the two configs in two different files 
(yarn-site.xml and capacity-scheduler.xml). 
 
Maybe a better approach is: we can delete the scheduling-request.allowed in CS, 
and update placement-constraints configs in yarn-site.xml a bit: 
 
- Remove placement-constraints.enabled, and add a new 
placement-constraints.handler, by default is none, and other acceptable values 
are a. external-processor (since algorithm is too generic to me), b. scheduler. 
- And add a new PlacementProcessor just to pass SchedulingRequest to scheduler 
without any modifications.



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