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Date: Wed, 28 Aug 2013 08:50:52 +0000 (UTC)
From: "Sandy Ryza (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Message-ID: <JIRA.12665872.1377679304483.45823.1377679852758@arcas>
In-Reply-To: <JIRA.12665872.1377679304483@arcas>
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Subject: [jira] [Assigned] (MAPREDUCE-5484) YarnChild unnecessarily loads
 job conf twice
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-5484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sandy Ryza reassigned MAPREDUCE-5484:
-------------------------------------

    Assignee: Sandy Ryza
    
> 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
>            Assignee: Sandy Ryza
>              Labels: perfomance
>         Attachments: MAPREDUCE-5484.patch
>
>
> 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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