Haibo Chen created YARN-8250:
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Summary: Create another implementation of ContainerScheduler to
support NM overallocation
Key: YARN-8250
URL: https://issues.apache.org/jira/browse/YARN-8250
Project: Hadoop YARN
Issue Type: Improvement
Reporter: Haibo Chen
Assignee: Haibo Chen
YARN-6675 adds NM over-allocation support by modifying the existing
ContainerScheduler and providing a utilizationBased resource tracker.
However, the implementation adds a lot of complexity to ContainerScheduler, and
future tweak of over-allocation strategy based on how much containers have been
launched is even more complicated.
As such, this Jira proposes a new ContainerScheduler that always launch
guaranteed containers immediately and queues opportunistic containers. It
relies on a periodical check to launch opportunistic containers.
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