Konstantinos Karanasos updated YARN-7778:
    Summary: Merging of placement constraints defined at different levels  
(was: Merging of constraints defined at different levels)

> Merging of placement 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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