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Posted to mapreduce-issues@hadoop.apache.org by "Sandy Ryza (JIRA)" <ji...@apache.org> on 2013/08/29 21:39:52 UTC

[jira] [Updated] (MAPREDUCE-5487) In task processes, JobConf is unnecessarily loaded again in Limits

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5487?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sandy Ryza updated MAPREDUCE-5487:
----------------------------------

    Assignee: Sandy Ryza
      Status: Patch Available  (was: Open)
    
> 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
>            Assignee: Sandy Ryza
>         Attachments: MAPREDUCE-5487.patch
>
>
> 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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