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https://issues.apache.org/jira/browse/YARN-7920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361907#comment-16361907
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Sunil G commented on YARN-7920:
-------------------------------

Thanks [~leftnoteasy] for the patch.  Refactoring looks fine to me.

Few comments in general
 # {{YarnConfiguration.java}} has few new properties added, could you please 
help to update javadoc of those a bit more with details.
 # For above configs, i think we can skip 
DEFAULT_RM_PLACEMENT_CONSTRAINTS_HANDLER and have only 
NONE_RM_PLACEMENT_CONSTRAINTS_HANDLER
 # Please update {{PlacementConstraints.md.vm}} where we are mentioning about 
{{yarn.resourcemanager.placement-constraints.enabled}}

> 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
>            Priority: Blocker
>         Attachments: YARN-7920.001.patch
>
>
> 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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