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Type:
Sub-task
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Status: Closed
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: 0.23.0
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Fix Version/s: 0.23.1
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Component/s: mr-am, mrv2, performance
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Labels:None
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Target Version/s:
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Hadoop Flags:Reviewed
MR AM creates new JobConf objects unnecessarily in a couple of places in JobImpl and TaskImpl which occupy non-trivial amount of heap.
While working with a 64 bit JVM on 100K maps jobs, with uncompressed pointers, removing those extraneous objects helped in addressing OOM with 2GB AM heap size.