[jira] [Created] (YARN-8379) Add an option to allow Capacity Scheduler preemption to balance satisfied queues

["Wangda Tan (JIRA)" <ji...@apache.org>]

Wangda Tan created YARN-8379:
--------------------------------

             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.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

---------------------------------------------------------------------
To unsubscribe, e-mail: yarn-dev-unsubscribe@hadoop.apache.org
For additional commands, e-mail: yarn-dev-help@hadoop.apache.org