Jason Lowe created YARN-4610:
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Summary: Reservations continue looking for one app causes other
apps to starve
Key: YARN-4610
URL: https://issues.apache.org/jira/browse/YARN-4610
Project: Hadoop YARN
Issue Type: Bug
Components: capacityscheduler
Affects Versions: 2.7.1
Reporter: Jason Lowe
Assignee: Jason Lowe
Priority: Blocker
CapacityScheduler's LeafQueue has "reservations continue looking" logic that
allows an application to unreserve elsewhere to fulfil a container request on a
node that has available space. However in 2.7 that logic seems to break
allocations for subsequent apps in the queue. Once a user hits its user limit,
subsequent apps in the queue for other users receive containers at a
significantly reduced rate.
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