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Posted to mapreduce-issues@hadoop.apache.org by "Sandy Ryza (JIRA)" <ji...@apache.org> on 2013/08/29 21:37:52 UTC
[jira] [Created] (MAPREDUCE-5487) In task processes, JobConf is
unnecessarily loaded again in Limits
Sandy Ryza created MAPREDUCE-5487:
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Summary: In task processes, JobConf is unnecessarily loaded again in Limits
Key: MAPREDUCE-5487
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5487
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: performance, task
Affects Versions: 2.1.0-beta
Reporter: Sandy Ryza
Limits statically loads a JobConf, which incurs costs of reading files from disk and parsing XML. The contents of this JobConf are identical to the one loaded by YarnChild (before adding job.xml as a resource). Allowing Limits to initialize with the JobConf loaded in YarnChild would reduce task startup time.
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