Sandy Ryza created MAPREDUCE-5321:
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Summary: Enable better parallelism in the Fair Scheduler
Key: MAPREDUCE-5321
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5321
Project: Hadoop Map/Reduce
Issue Type: Improvement
Reporter: Sandy Ryza
Assignee: Sandy Ryza
Currently, the Fair Scheduler is locked on pretty much every operation, node
updates, application additions and removals, every time the update thread runs,
and every time the RM queries it for information. Most of this locking is
unnecessary, especially as only the core scheduling operations like application
additions, removals, and node updates need a consistent view of scheduler state.
We can probably increase parallelism by using concurrent data structures when
applicable, as well as keeping a slightly stale view to serve via the RM APIs.
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