PengZhang created MAPREDUCE-5279:
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Summary: 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
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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