Sandy Ryza created MAPREDUCE-5484:
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Summary: YarnChild unnecessarily loads job conf twice
Key: MAPREDUCE-5484
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5484
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: task
Affects Versions: 2.1.0-beta
Reporter: Sandy Ryza
In MR task processes, a JobConf is instantiated with the same job.xml twice,
once at the beginning of main() and once in configureTask. IIUC, the second
instantiation is not necessary. These take time reading from disk and parsing
XML.
Removing the second instantiation shaved a second off the average map task time
in a 1,000-map sleep job.
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