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https://issues.apache.org/jira/browse/YARN-110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14596614#comment-14596614
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Giovanni Matteo Fumarola commented on YARN-110:
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[~acmurthy], [~vinodkv] any updates on this? 
If you don't mind, can I work on this?

> AM releases too many containers due to the protocol
> ---------------------------------------------------
>
>                 Key: YARN-110
>                 URL: https://issues.apache.org/jira/browse/YARN-110
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager, scheduler
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>         Attachments: YARN-110.patch
>
>
> - AM sends request asking 4 containers on host H1.
> - Asynchronously, host H1 reaches RM and gets assigned 4 containers. RM at 
> this point, sets the value against H1 to
> zero in its aggregate request-table for all apps.
> - In the mean-while AM gets to need 3 more containers, so a total of 7 
> including the 4 from previous request.
> - Today, AM sends the absolute number of 7 against H1 to RM as part of its 
> request table.
> - RM seems to be overriding its earlier value of zero against H1 to 7 against 
> H1. And thus allocating 7 more
> containers.
> - AM already gets 4 in this scheduling iteration, but gets 7 more, a total of 
> 11 instead of the required 7.



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