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Posted to mapreduce-dev@hadoop.apache.org by "Sandy Ryza (JIRA)" <ji...@apache.org> on 2013/08/29 21:37:53 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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