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https://issues.apache.org/jira/browse/YARN-3656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14630251#comment-14630251
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Subru Krishnan commented on YARN-3656:
--------------------------------------

Thanks [~asuresh] for reviewing the patch. We did consider allowing declarative 
plugging of planners during the early stages of development but decided against 
it to keep the code base simpler to make it easier to grok as the current 
algorithms themselves are non-trivial. We are open to doing this in the future 
as & when the need arises.

> LowCost: A Cost-Based Placement Agent for YARN Reservations
> -----------------------------------------------------------
>
>                 Key: YARN-3656
>                 URL: https://issues.apache.org/jira/browse/YARN-3656
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: capacityscheduler, resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Ishai Menache
>            Assignee: Jonathan Yaniv
>              Labels: capacity-scheduler, resourcemanager
>         Attachments: LowCostRayonExternal.pdf, YARN-3656-v1.1.patch, 
> YARN-3656-v1.2.patch, YARN-3656-v1.patch, lowcostrayonexternal_v2.pdf
>
>
> YARN-1051 enables SLA support by allowing users to reserve cluster capacity 
> ahead of time. YARN-1710 introduced a greedy agent for placing user 
> reservations. The greedy agent makes fast placement decisions but at the cost 
> of ignoring the cluster committed resources, which might result in blocking 
> the cluster resources for certain periods of time, and in turn rejecting some 
> arriving jobs.
> We propose LowCost – a new cost-based planning algorithm. LowCost “spreads” 
> the demand of the job throughout the allowed time-window according to a 
> global, load-based cost function. 



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