[YARN-3489] RMServerUtils.validateResourceRequests should only obtain queue info once

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0
• Fix Version/s: 2.8.0, 2.7.1, 3.0.0-alpha1
• Component/s: resourcemanager
• Labels: BB2015-05-RFC
• Target Version/s: 2.7.1
• Hadoop Flags: Reviewed
• Assignee: Varun Saxena
• Reporter: Jason Darrell Lowe
• Created: 15/Apr/15 14:18
• Updated: 06/Jan/17 00:57
• Resolved: 29/May/15 00:06

Description

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.