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From "Konstantinos Karanasos (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6593) [API] Introduce Placement Constraint object
Date Thu, 20 Jul 2017 23:46:01 GMT

    [ https://issues.apache.org/jira/browse/YARN-6593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095566#comment-16095566
] 

Konstantinos Karanasos commented on YARN-6593:
----------------------------------------------

Thanks for the feedback, [~leftnoteasy] and [~chris.douglas]!

I will address all your comments and upload a new version.

bq. I'm not sure when you plan to use SingleConstraintTransformer/SpecializedConstraintTransformer.
If you agree that they should not be user-facing, do you think we should move them to a separate
JIRA while doing implementation?
I agree they should not be user-facing -- I will fix the annotations.
The transformations will, for example, be used at the scheduler side, if the scheduler wants
to do something with specific cardinality or target constraints. I would suggest to keep it
at this JIRA so that we have all these related changes clubbed together.

It seems that the problem of updating constraints would require more discussion. Since this
patch is already introducing a lot of new stuff, I would also suggest to push the update to
future work, after we discuss what the exact semantics of updating constraints are. A first
solution to the problem would be, like you say, to invalidate an existing scheduling request
and send a new one.



> [API] Introduce Placement Constraint object
> -------------------------------------------
>
>                 Key: YARN-6593
>                 URL: https://issues.apache.org/jira/browse/YARN-6593
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Konstantinos Karanasos
>            Assignee: Konstantinos Karanasos
>             Fix For: 3.0.0-alpha3
>
>         Attachments: YARN-6593.001.patch, YARN-6593.002.patch, YARN-6593.003.patch, YARN-6593.004.patch
>
>
> This JIRA introduces an object for defining placement constraints.



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