Wangda Tan created YARN-2933:
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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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