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Posted to mapreduce-issues@hadoop.apache.org by "Tsuyoshi OZAWA (JIRA)" <ji...@apache.org> on 2013/07/26 12:03:50 UTC

[jira] [Updated] (MAPREDUCE-5279) mapreduce scheduling deadlock

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5279?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsuyoshi OZAWA updated MAPREDUCE-5279:
--------------------------------------

    Assignee: PengZhang
    
> mapreduce scheduling deadlock
> -----------------------------
>
>                 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: PengZhang
>            Assignee: PengZhang
>             Fix For: trunk
>
>         Attachments: MAPREDUCE-5279.patch, MAPREDUCE-5279-v2.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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