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Posted to yarn-issues@hadoop.apache.org by "Jonathan Hung (Jira)" <ji...@apache.org> on 2019/09/09 20:40:00 UTC
[jira] [Updated] (YARN-9770) Create a queue ordering policy which
picks child queues with equal probability
[ https://issues.apache.org/jira/browse/YARN-9770?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Hung updated YARN-9770:
--------------------------------
Labels: (was: release-blocker)
> 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
> Priority: Major
> Attachments: YARN-9770.001.patch, YARN-9770.002.patch, YARN-9770.003.patch, activeUsers_overlay.png
>
>
> 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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