Jason Lowe created YARN-3489:

             Summary: RMServerUtils.validateResourceRequests should only obtain 
queue info once
                 Key: YARN-3489
                 URL: https://issues.apache.org/jira/browse/YARN-3489
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: resourcemanager
    Affects Versions: 2.6.0
            Reporter: Jason Lowe

Since the label support was added we now get the queue info for each request 
being validated in SchedulerUtils.validateResourceRequest.  If 
validateResourceRequests needs to validate a lot of requests at a time (e.g.: 
large cluster with lots of varied locality in the requests) then it will get 
the queue info for each request.  Since we build the queue info this generates 
a lot of unnecessary garbage, as the queue isn't changing between requests.  We 
should grab the queue info once and pass it down rather than building it again 
for each request.

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