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Date: Sat, 24 Dec 2016 18:23:58 +0000 (UTC)
From: "Karthik Kambatla (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.13030192.1482427188000.592797.1482603838409@Atlassian.JIRA>
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Subject: [jira] [Resolved] (YARN-6021) When your allocated minShare of all
 queue`s added up exceed cluster capacity you can get some queue for 0
 fairshare
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archived-at: Sat, 24 Dec 2016 18:24:00 -0000


     [ https://issues.apache.org/jira/browse/YARN-6021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karthik Kambatla resolved YARN-6021.
------------------------------------
    Resolution: Not A Problem

I am closing this as "Not a Problem". Please reopen it if this is indeed an issue. 

> When your allocated minShare of all queue`s added up exceed cluster capacity you can get some queue for 0 fairshare
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-6021
>                 URL: https://issues.apache.org/jira/browse/YARN-6021
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.4.0
>            Reporter: Feng Yuan
>            Assignee: Feng Yuan
>            Priority: Critical
>
> In fair-scheduler.xml,If you config the minshare add up exceed parentQueue`s fairshare,for root`s childs,fairshare is cluster capacity.
> You will found your R value look like below when compute childs fairshares:
> 1.0 
> 0.5 
> 0.25 
> 0.125 
> 0.0625 
> 0.03125 
> 0.015625 
> 0.0078125 
> 0.00390625
> I find this is due to:
> double rMax = 1.0;
>     while (resourceUsedWithWeightToResourceRatio(rMax, schedulables, type)
>         < totalResource) {
>       rMax *= 2.0;
>   }
> because resourceUsedWithWeightToResourceRatio will add minShare together.
> As i think is really should we bring in minShare when compute fairshare?
> My advice is we just consider weight is enough,and minshare's guarantee
> will get fulfill when assginContainer!
> Hope suggestion!


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