Wangda Tan created YARN-8379:
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Summary: 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
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.
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