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https://issues.apache.org/jira/browse/YARN-7920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16364214#comment-16364214
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Wangda Tan commented on YARN-7920:
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+ [~cheersyang]
> 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, YARN-7920.002.patch,
> YARN-7920.003.patch, YARN-7920.004.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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