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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:
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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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