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From "Peng Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5279) Jobs can deadlock if headroom is limited by cpu instead of memory
Date Thu, 11 Sep 2014 03:23:34 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14129573#comment-14129573
] 

Peng Zhang commented on MAPREDUCE-5279:
---------------------------------------

Recently we have applied it to hadoop 2.4
I'll merge this patch to trunk this week

> Jobs can deadlock if headroom is limited by cpu instead of memory
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-5279
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5279
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2, scheduler
>    Affects Versions: 2.0.3-alpha
>            Reporter: Peng Zhang
>            Assignee: Peng Zhang
>            Priority: Critical
>         Attachments: MAPREDUCE-5279-v2.patch, MAPREDUCE-5279.patch
>
>
> YARN-2 imported cpu dimension scheduling, but MR RMContainerAllocator doesn't take into
account virtual cores while scheduling reduce tasks.
> This may cause more reduce tasks to be scheduled because memory is enough. And on a small
cluster, this will end with deadlock, all running containers are reduce tasks but map phase
is not finished. 



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