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https://issues.apache.org/jira/browse/YARN-2187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14039726#comment-14039726
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Karthik Kambatla commented on YARN-2187:
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+1. Committing this. 

> FairScheduler: Disable max-AM-share check by default
> ----------------------------------------------------
>
>                 Key: YARN-2187
>                 URL: https://issues.apache.org/jira/browse/YARN-2187
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.5.0
>            Reporter: Robert Kanter
>            Assignee: Robert Kanter
>         Attachments: YARN-2187.patch
>
>
> Say you have a small cluster with 8gb memory and 5 queues.  This means that 
> equal queue can have 8gb / 5 = 1.6gb but an AM requires 2gb to start so no 
> AMs can be started.  By default, max-am-share check should be disabled so 
> users don't see a regression. On medium-sized clusters, it still makes sense 
> to set the max-am-share to a value between 0 and 1. 



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