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From "Konstantinos Karanasos (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-7778) Merging of constraints defined at different levels
Date Fri, 19 Jan 2018 08:38:00 GMT
Konstantinos Karanasos created YARN-7778:
--------------------------------------------

             Summary: 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


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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