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https://issues.apache.org/jira/browse/YARN-4360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15138152#comment-15138152
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Carlo Curino commented on YARN-4360:
------------------------------------
Also big thank you to [~chris.douglas] who very patiently walked through the
{{StageAllocatorGreedyRLE}} with me. We spotted a couple of ways to simplify /
increase readability and avoid a potential infinite loop (not sure if in
practice would materialized, but increased code hygiene nonetheless).
Uploading a v6 including all of the above.
> Improve GreedyReservationAgent to support "early" allocations, and
> performance improvements
> --------------------------------------------------------------------------------------------
>
> Key: YARN-4360
> URL: https://issues.apache.org/jira/browse/YARN-4360
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: capacityscheduler, fairscheduler, resourcemanager
> Affects Versions: 2.8.0
> Reporter: Carlo Curino
> Assignee: Carlo Curino
> Attachments: YARN-4360.2.patch, YARN-4360.3.patch, YARN-4360.5.patch,
> YARN-4360.patch
>
>
> The GreedyReservationAgent allocates "as late as possible". Per various
> conversations, it seems useful to have a mirror behavior that allocates as
> early as possible. Also in the process we leverage improvements from
> YARN-4358, and implement an RLE-aware StageAllocatorGreedy(RLE), which
> significantly speeds up allocation.
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