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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-2933) Capacity Scheduler preemption policy should only consider capacity without labels temporarily
Date Tue, 09 Dec 2014 00:40:12 GMT
Wangda Tan created YARN-2933:
--------------------------------

             Summary: Capacity Scheduler preemption policy should only consider capacity without
labels temporarily
                 Key: YARN-2933
                 URL: https://issues.apache.org/jira/browse/YARN-2933
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: capacityscheduler
            Reporter: Wangda Tan
            Assignee: Wangda Tan


Currently, we have capacity enforcement on each queue for each label in CapacityScheduler,
but we don't have preemption policy to support that. YARN-2498 is targeting to support preemption
respect node labels, but we have some gaps in code base, like queues/FiCaScheduler should
be able to get usedResource/pendingResource, etc. by label. These items potentially need to
refactor CS which we need spend some time carefully think about.

For now, what immediately we can do is allow calculate ideal_allocation and preempt containers
only for resources on nodes without labels, to avoid regression like: A cluster has some nodes
with labels and some not, assume queueA isn't satisfied for resource without label, but for
now, preemption policy may preempt resource from nodes with labels for queueA, that is not
correct.

Again, it is just a short-term enhancement, YARN-2498 will consider preemption respecting
node-labels for Capacity Scheduler which is our final target. 



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