[jira] [Commented] (YARN-6599) Support rich placement constraints in scheduler

["Carlo Curino (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-6599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16016765#comment-16016765 ] 

Carlo Curino commented on YARN-6599:
------------------------------------

[~leftnoteasy] I am not sure I understand this JIRA. I thought we discussed this offline with [~vinodkv], [~chris.douglas], [~kkaranasos], [~subru] and [~asuresh], 
and agreed that we were *not* going to add extra stuff inside the scheduler to support constraints, as the scheduler(s) code is becoming untenable to maintain 
and scale.

I think it would be best to keep the constraints management code in the scheduler pre-processor / {{PlacementConstraintManager}} so that the feature is 
orthogonal to the scheduler(s) and does not add complexity there.  

Can you explain what has changed since that discussion? I noticed that in the document you also stated there is no agreement on this, while I thought was 
(after a lengthy discussion) a settled issue.


> Support rich placement constraints in scheduler
> -----------------------------------------------
>
>                 Key: YARN-6599
>                 URL: https://issues.apache.org/jira/browse/YARN-6599
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>




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