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https://issues.apache.org/jira/browse/MAPREDUCE-5484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754010#comment-13754010
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Alejandro Abdelnur commented on MAPREDUCE-5484:
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+1 LGTM
> 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-5484-1.patch, 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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