Konstantinos Karanasos created YARN-7778:
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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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