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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