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Date: Fri, 21 Sep 2012 12:25:09 +1100 (NCT)
From: "Bikas Saha (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Updated] (MAPREDUCE-4671) AM does not tell the RM about
 container requests that are no longer needed
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-4671?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bikas Saha updated MAPREDUCE-4671:
----------------------------------

    Attachment: MAPREDUCE-4671.2.patch

New patch ensures that there wont be duplicates in the ask set. 
I have left a question in comments for the committers.
                
> AM does not tell the RM about container requests that are no longer needed
> --------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4671
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4671
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Bikas Saha
>            Assignee: Bikas Saha
>         Attachments: MAPREDUCE-4671.1.patch, MAPREDUCE-4671.2.patch
>
>
> Say the AM wanted a container at hosts h1, h2, h3. After getting a container at h1 it should tell RM that it no longer needs containers at h2, h3. Otherwise on the RM h2, h3 remain valid allocation locations.
> The AM RMContainerAllocator does remove these resource requests internally. When the resource request container count drops to 0 then it drops the resource request from its tables but forgets to send the 0 sized request to the RM.

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