Weiwei Yang commented on YARN-7142:

Hi [~gsaha]/[~leftnoteasy]

Thanks for backing port this to branch-3.1. Not related to this task, I have a 
question about the format of placement policy in yaml file. It looks like it is 
more like an interpretation of how we specify placement constraints using Java 
API. I think we should be able to support a simple PC language, by specifying 
something like:




see more in [^Placement Constraint Expression Syntax Specification.pdf], 
YARN-7921. I know this is only used distributed shell as a demo, but I think if 
we find this more easier to write, maybe we can use such expression here too? 
Just want to know your opinion.


> 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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