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https://issues.apache.org/jira/browse/YARN-3656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14546361#comment-14546361
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Ishai Menache commented on YARN-3656:
-------------------------------------

LowCost judiciously “spreads” the demand of the job throughout the allowed 
time-window according to a global, load-based cost function. This leads to more 
balanced allocations, and in turn substantially improves the acceptance rate of 
jobs and the cluster utilization. 

> 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
>            Reporter: Ishai Menache
>
> 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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