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Wangda Tan commented on YARN-8379: ---------------------------------- To make better resource balances between queues, we propose to make the additional preemption between queues configurable. And admin can set a different kill-before-wait timeout to control the pace of the additional queue balance preemption. cc: [~jlowe], [~eepayne], [~sunilg] for suggestions. Thanks [~clayb]/[~Zian Chen] for offline suggestions and feedbacks. > Add an option to allow Capacity Scheduler preemption to balance satisfied > queues > -------------------------------------------------------------------------------- > > Key: YARN-8379 > URL: https://issues.apache.org/jira/browse/YARN-8379 > Project: Hadoop YARN > Issue Type: Bug > Reporter: Wangda Tan > Assignee: Wangda Tan > Priority: Major > > Existing capacity scheduler only supports preemption for an underutilized > queue to reach its guaranteed resource. In addition to that, there’s an > requirement to get better balance between queues when all of them reach > guaranteed resource but with different fairness resource. > An example is, 3 queues with capacity, queue_a = 30%, queue_b = 30%, queue_c > = 40%. At time T. queue_a is using 30%, queue_b is using 70%. Existing > scheduler preemption won't happen. But this is unfair to queue_b since > queue_b has the same guaranteed resources. > Before YARN-5864, capacity scheduler do additional preemption to balance > queues. We changed the logic since it could preempt too many containers > between queues when all queues are satisfied. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: yarn-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: yarn-issues-h...@hadoop.apache.org