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From "Carlo Curino (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3656) LowCost: A Cost-Based Placement Agent for YARN Reservations
Date Wed, 17 Jun 2015 22:00:03 GMT

    [ https://issues.apache.org/jira/browse/YARN-3656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14590699#comment-14590699

Carlo Curino commented on YARN-3656:

Patch looks good to me (as you followed all previous rounds of advises we discussed). 

Looking at it, I would argue that the "structure" of a solution you provide, i.e., decomposing
the placement agent into various sub-routines and a choice of policies for  time-range selection
(IStageEarliestStart) , and single-atom allocation (IStageAllocator) is quite elegant. I would
propose, in fact, to "gut" the existing GreedyReservationAgent and turn it into a simple "configuration"
class that selects the right set of policies for IStageAllocator, IStageEarliestStart and
iteratively run over those. This would be cleaner, and make it easier for people to improve
on specific sub-set of this problem. If you agree with this, you must ensure the behavior
is "identical" to the current GreedyReservationAgent.  You should be able to do this fairly
easily given the infrastructure you have for your agents and the testing harnesses you have
in place.

My 2 cents...

> 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.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

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