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Posted to mapreduce-issues@hadoop.apache.org by "Bo Wang (JIRA)" <ji...@apache.org> on 2012/09/21 01:07:07 UTC

[jira] [Commented] (MAPREDUCE-4671) AM does not tell the RM about container requests that are no longer needed

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13460037#comment-13460037 ] 

Bo Wang commented on MAPREDUCE-4671:
------------------------------------

This is a problem I'd questioned. Good to see the JIRA.
                
> 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
>
> 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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