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https://issues.apache.org/jira/browse/YARN-4360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15137865#comment-15137865
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Carlo Curino commented on YARN-4360:
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[~asuresh], thanks for the comments. I address GreedyReservationAgent 1,2.
IterativePlanner 1 is not an exact duplication, but I merged the code by
complicating
a bit the boolean expression (need to check either direction). I left a comment
to highlight this. Regarding IterativePlanner (2) I believe that is correct,
and cleaner
that what was there before. We are generally using exception to signal a failed
acceptance.
StageAllocatorGreedyRLE (1): we need to do it this way to signal via
side-effects the occupied resources to other runs of StageAllocatorGreedyRLE
that place other
stages. E.g., if we have an "AND" type reservation (where 2 stages are allowed
to overlap), we need to know when we place the second one, that the first one
already
consumed some resources during a time range t1,t2. This is done through this
planModifications data structure (passed in by IterativePlanner).
> 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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