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https://issues.apache.org/jira/browse/YARN-7778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16348233#comment-16348233
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Weiwei Yang commented on YARN-7778:
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Hi [~kkaranasos] please take a look when you get a chance. Thanks!
> Merging of constraints defined at different levels
> --------------------------------------------------
>
> Key: YARN-7778
> URL: https://issues.apache.org/jira/browse/YARN-7778
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Konstantinos Karanasos
> Assignee: Weiwei Yang
> Priority: Major
> Attachments: Merge Constraints Solution.pdf,
> YARN-7778-YARN-7812.001.patch, YARN-7778-YARN-7812.002.patch,
> YARN-7778.003.patch, YARN-7778.004.patch
>
>
> When we have multiple constraints defined for a given set of allocation tags
> at different levels (i.e., at the cluster, the application or the scheduling
> request level), we need to merge those constraints.
> Defining constraint levels as cluster > application > scheduling request,
> constraints defined at lower levels should only be more restrictive than
> those of higher levels. Otherwise the allocation should fail.
> For example, if there is an application level constraint that allows no more
> than 5 HBase containers per rack, a scheduling request can further restrict
> that to 3 containers per rack but not to 7 containers per rack.
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