[jira] [Created] (YARN-4792) FairScheduler should do sanity checks on its configuration

["Yufei Gu (JIRA)" <ji...@apache.org>]

Yufei Gu created YARN-4792:
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             Summary: FairScheduler should do sanity checks on its configuration
                 Key: YARN-4792
                 URL: https://issues.apache.org/jira/browse/YARN-4792
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: fairscheduler, yarn
    Affects Versions: 2.9.0
            Reporter: Yufei Gu
            Assignee: Yufei Gu


The FairScheduler does not perform any sanity checks on the configuration that it uses.
This can lead to a configuration that is legal but does not make sense in a cluster to use, and causes support cases to be filed:
limit the root queue to a certain size for memory or vcores: the cluster resources limit the root queue already and there should be no need for an extra artificial limit
setting max running applications on a leaf queue larger than the parent queue(s)
setting max running applications larger than the queue size (example: minimum vcore allocation * number of apps > total vcores in the queue)
There are possibly more checks



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