[YARN-8992] Fair scheduler can delete a dynamic queue while an application attempt is being added to the queue - ASF JIRA

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As discovered in ~~YARN-8990~~, QueueManager can see a leaf queue being empty while FSLeafQueue.addApp() is called in the middle of

return queue.getNumRunnableApps() == 0 &&
          leafQueue.getNumNonRunnableApps() == 0 &&
          leafQueue.getNumAssignedApps() == 0;

is related to

YARN-8990 Fix fair scheduler race condition in app submit and queue cleanup

links to

GitHub Pull Request #3257

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