Wangda Tan commented on YARN-7920:

[~cheersyang], I think it should be fine, user should know that 
${project.version} need to be properly substituted.

> Simplify configuration for 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
>             Fix For: 3.1.0
>         Attachments: YARN-7920.001.patch, YARN-7920.002.patch, 
> YARN-7920.003.patch, YARN-7920.004.patch, YARN-7920.005.patch, 
> YARN-7920.006.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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