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https://issues.apache.org/jira/browse/MAPREDUCE-5130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13648818#comment-13648818
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Karthik Kambatla commented on MAPREDUCE-5130:
---------------------------------------------

Given that the default for mapred.child.java.opts is 200 MB, I don't think we 
should set mapredue.map|reduce.memory.mb as high as 1 GB.
                
> Add missing job config options to mapred-default.xml
> ----------------------------------------------------
>
>                 Key: MAPREDUCE-5130
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5130
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: documentation
>    Affects Versions: 2.0.4-alpha
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>         Attachments: MAPREDUCE-5130.patch
>
>
> I came across that mapreduce.map.child.java.opts and 
> mapreduce.reduce.child.java.opts were missing in mapred-default.xml.  I'll do 
> a fuller sweep to see what else is missing before posting a patch.
> List so far:
> mapreduce.map/reduce.child.java.opts
> mapreduce.map/reduce.memory.mb
> mapreduce.job.jvm.numtasks
> mapreduce.input.lineinputformat.linespermap
> mapreduce.task.combine.progress.records

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