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https://issues.apache.org/jira/browse/YARN-276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14534947#comment-14534947
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Vinod Kumar Vavilapalli commented on YARN-276:
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There is a lot of history here.

[~cwelch] / [~leftnoteasy], I think one of your recent patches (YARN-2637?) may 
have fixed this. Can you please go through this JIRA and confirm/resolve it?

> Capacity Scheduler can hang when submit many jobs concurrently
> --------------------------------------------------------------
>
>                 Key: YARN-276
>                 URL: https://issues.apache.org/jira/browse/YARN-276
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 3.0.0, 2.0.1-alpha
>            Reporter: Nemon Lou
>            Assignee: Nemon Lou
>              Labels: incompatible
>         Attachments: YARN-276.patch, YARN-276.patch, YARN-276.patch, 
> YARN-276.patch, YARN-276.patch, YARN-276.patch, YARN-276.patch, 
> YARN-276.patch, YARN-276.patch, YARN-276.patch, YARN-276.patch, 
> YARN-276.patch, YARN-276.patch, YARN-276.patch, YARN-276.patch, YARN-276.patch
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> In hadoop2.0.1,When i submit many jobs concurrently at the same time,Capacity 
> scheduler can hang with most resources taken up by AM and don't have enough 
> resources for tasks.And then all applications hang there.
> The cause is that "yarn.scheduler.capacity.maximum-am-resource-percent" not 
> check directly.Instead ,this property only used for maxActiveApplications. 
> And maxActiveApplications is computed by minimumAllocation (not by Am 
> actually used).



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