[jira] [Updated] (YARN-7778) Merging of constraints defined at different levels

["Weiwei Yang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-7778?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Weiwei Yang updated YARN-7778:
------------------------------
    Attachment: YARN-7778.003.patch

> 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
>
>
> 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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