[jira] [Assigned] (YARN-6021) When your allocated minShare of all queue`s added up exceed cluster capacity you can get some queue for 0 fairshare

["Feng Yuan (JIRA)" <ji...@apache.org>]

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

Feng Yuan reassigned YARN-6021:
-------------------------------

    Assignee: Feng Yuan

> 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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