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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6599) Support rich placement constraints in scheduler
Date Fri, 05 Jan 2018 23:46:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16314152#comment-16314152

Arun Suresh commented on YARN-6599:

[~leftnoteasy], thanks for working on this. Couple of comments:

* I think you should keep the name of the main entry point method as {{canSatisfyConstraints}}.
The single constraint is a special case and you can have a private method for it, once we
decide in the above function that the constraint is a single constraint type.
* Shouldnt you have to do the checkMinCardinality in all cases ?
* Can we split the node-partition target expression handling aspect into a separate JIRA maybe
* To check if the given constraint is a SingleConstraint, you should use the transformer first
before doing a type cast.
* Can we target this JIRA for just intra-app anti-affinity. I am also not really sold on the
application-id/allocation-tag format yet. It requires that the first app be running and then
the second app (since we wont have a application-Id till then) - Also if we couple this with
application priorities, I can think of a situation where we can deadlock.

> 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
>         Attachments: YARN-6599-YARN-6592.003.patch, YARN-6599-YARN-6592.004.patch, YARN-6599-YARN-6592.005.patch,
YARN-6599-YARN-6592.006.patch, YARN-6599-YARN-6592.007.patch, YARN-6599-YARN-6592.008.patch,
YARN-6599-YARN-6592.wip.002.patch, YARN-6599.poc.001.patch

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