[jira] [Created] (YARN-9770) Create a queue ordering policy which picks child queues with equal probability

["Jonathan Hung (Jira)" <ji...@apache.org>]

Jonathan Hung created YARN-9770:
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             Summary: Create a queue ordering policy which picks child queues with equal probability
                 Key: YARN-9770
                 URL: https://issues.apache.org/jira/browse/YARN-9770
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: Jonathan Hung
            Assignee: Jonathan Hung


Ran some simulations with the default queue_utilization_ordering_policy:

An underutilized queue which receives an application with many (thousands) resource requests will hog scheduler allocations for a long time (on the order of a minute). In the meantime apps are getting submitted to all other queues, which increases activeUsers in these queues, which drops user limit in these queues to small values if minimum-user-limit-percent is configured to small values (e.g. 10%).

To avoid this issue, we assign to queues with equal probability, to avoid scenarios where queues don't get allocations for a long time.



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