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XiandongQI commented on YARN-8379: ---------------------------------- if a container with a label is released, the current "PriorityUtilizationQueueOrderingPolicy.java" will give it to the user(leafquque) who has the access to this partition and has a lower absolute used capacity if all users have the same priority. > Improve balancing resources in already satisfied queues by using Capacity > Scheduler preemption > ---------------------------------------------------------------------------------------------- > > Key: YARN-8379 > URL: https://issues.apache.org/jira/browse/YARN-8379 > Project: Hadoop YARN > Issue Type: Bug > Reporter: Wangda Tan > Assignee: Zian Chen > Priority: Major > Fix For: 3.2.0, 3.1.1 > > Attachments: YARN-8379.001.patch, YARN-8379.002.patch, > YARN-8379.003.patch, YARN-8379.004.patch, YARN-8379.005.patch, > YARN-8379.006.patch, ericpayne.confs.tgz > > > 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_a since > queue_a 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