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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4360) Improve GreedyReservationAgent to support "early" allocations, and performance improvements
Date Mon, 25 Jan 2016 19:51:39 GMT

    [ https://issues.apache.org/jira/browse/YARN-4360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15115851#comment-15115851
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Arun Suresh commented on YARN-4360:
-----------------------------------

Spent some time going over {{StageAllocatorGreedyRLE}}. I generally makes sense.. I might
be missing something, but :

# Instead of doing a {{planModificiations.addInterval(..)}} in the {{trackProgress()}} method
and then subsequently, remove the {{tempAllocations}} if the requests is not satisfied, why
not just perform the {{planModification.addInterval()}} right before we return a successful
allocation, in line 179

> 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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