Jason Lowe created YARN-2176:
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Summary: CapacityScheduler loops over all running applications
rather than actively requesting apps
Key: YARN-2176
URL: https://issues.apache.org/jira/browse/YARN-2176
Project: Hadoop YARN
Issue Type: Improvement
Components: capacityscheduler
Affects Versions: 2.4.0
Reporter: Jason Lowe
The capacity scheduler performance is primarily dominated by
LeafQueue.assignContainers, and that currently loops over all applications that
are running in the queue. It would be more efficient if we looped over just
the applications that are actively asking for resources rather than all
applications, as there could be thousands of applications running but only a
few hundred that are currently asking for resources.
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