Gour Saha commented on YARN-7142:

{quote}I think we should be able to support a simple PC language, by specifying 
something like: notin,node,foo
[~cheersyang] thank you for the good suggestions. In my opinion, YARN Service 
should be viewed as a higher level abstraction for layman users who do not 
understand and don't want to understand YARN internals. They only understand 
their own application and their app deployment model. If the YARN Service API 
and spec are not simple and crisp it will immediately cause a barrier to such 
application-owners from coming to YARN. What do you think?

> Support placement policy in yarn native services
> ------------------------------------------------
>                 Key: YARN-7142
>                 URL: https://issues.apache.org/jira/browse/YARN-7142
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: yarn-native-services
>            Reporter: Billie Rinaldi
>            Assignee: Gour Saha
>            Priority: Major
>             Fix For: 3.2.0
>         Attachments: YARN-7142-branch-3.1.004.patch, YARN-7142.001.patch, 
> YARN-7142.002.patch, YARN-7142.003.patch, YARN-7142.004.patch
> Placement policy exists in the API but is not implemented yet.
> I have filed YARN-8074 to move the composite constraints implementation out 
> of this phase-1 implementation of placement policy.

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