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https://issues.apache.org/jira/browse/MAPREDUCE-7069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16434026#comment-16434026
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Jim Brennan commented on MAPREDUCE-7069:
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I can do this for some of them, but the base properties for 
{{mapreduce.map.env}} and {{mapreduce.reduce.env}} are already commented out so 
that they don't override {{mapreduce.child.env}}.  Do you think it is 
appropriate to put the documentation for those in the description for 
{{mapreduce.child.env}}?



> Add ability to specify user environment variables individually
> --------------------------------------------------------------
>
>                 Key: MAPREDUCE-7069
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7069
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Jim Brennan
>            Assignee: Jim Brennan
>            Priority: Major
>         Attachments: MAPREDUCE-7069.001.patch, MAPREDUCE-7069.002.patch, 
> MAPREDUCE-7069.003.patch, MAPREDUCE-7069.004.patch, MAPREDUCE-7069.005.patch, 
> MAPREDUCE-7069.006.patch
>
>
> As reported in YARN-6830, it is currently not possible to specify an 
> environment variable that contains commas via {{mapreduce.map.env}}, 
> mapreduce.reduce.env, or {{mapreduce.admin.user.env}}.
> To address this, [~aw] proposed in [YARN-6830] that we add the ability to 
> specify environment variables individually:
> {quote}e.g, mapreduce.map.env.[foo]=bar gets turned into foo=bar
> {quote}



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