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https://issues.apache.org/jira/browse/MAPREDUCE-5279?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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PengZhang updated MAPREDUCE-5279:
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Attachment: MAPREDUCE-5279.patch
> 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
> Attachments: 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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