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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-3485) FairScheduler headroom calculation doesn't consider maxResources for Fifo and FairShare policies
Date Sat, 25 Apr 2015 01:38:38 GMT

     [ https://issues.apache.org/jira/browse/YARN-3485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Karthik Kambatla updated YARN-3485:
-----------------------------------
    Attachment:     (was: yarn-3485-1.patch)

> FairScheduler headroom calculation doesn't consider maxResources for Fifo and FairShare
policies
> ------------------------------------------------------------------------------------------------
>
>                 Key: YARN-3485
>                 URL: https://issues.apache.org/jira/browse/YARN-3485
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.7.0
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>            Priority: Critical
>         Attachments: yarn-3485-1.patch, yarn-3485-prelim.patch
>
>
> FairScheduler's headroom calculations consider the fairshare and cluster-available-resources,
and the fairshare has maxResources. However, for Fifo and Fairshare policies, the fairshare
is used only for memory and not cpu. So, the scheduler ends up showing a higher headroom than
is actually available. This could lead to applications waiting for resources far longer than
then intend to. e.g. MAPREDUCE-6302.



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