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From "Konstantinos Karanasos (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7682) Expose canAssign method in the PlacementConstraintManager
Date Wed, 03 Jan 2018 07:10:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16309227#comment-16309227
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Konstantinos Karanasos commented on YARN-7682:
----------------------------------------------

bq. but did not get why we need to assert that minScopeCardinality <= maxScopeCardinality.
We don’t really need to. I thought of it just as a sanity check that the user has not messed
up with multiple tags, that is, to make sure that the max of mins is not larger than the min
of maxs. If the constraint is right, this should not be the case. 

> Expose canAssign method in the PlacementConstraintManager
> ---------------------------------------------------------
>
>                 Key: YARN-7682
>                 URL: https://issues.apache.org/jira/browse/YARN-7682
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Arun Suresh
>            Assignee: Panagiotis Garefalakis
>         Attachments: YARN-7682-YARN-6592.001.patch, YARN-7682-YARN-6592.002.patch, YARN-7682-YARN-6592.003.patch,
YARN-7682.wip.patch
>
>
> As per discussion in YARN-7613. Lets expose {{canAssign}} method in the PlacementConstraintManager
that takes a sourceTags, applicationId, SchedulerNode and AllocationTagsManager and returns
true if constraints are not violated by placing the container on the node.
> I prefer not passing in the SchedulingRequest, since it can have > 1 numAllocations.
We want this api to be called for single allocations.



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