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https://issues.apache.org/jira/browse/MAPREDUCE-4374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13403423#comment-13403423
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Vinod Kumar Vavilapalli commented on MAPREDUCE-4374:
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Just checked that the CLASSPATH separator on Windows is indeed ';', so yeah, it
is natural to use it. Same for '%'.
Good to see that we are not breaking any compatibility for existing users and
only defining new behaviour for users on Windows.
bq. Why not use existing syntax, i.e. $ and ':' (e.g. '$x=a:b'), to set
environment variables on Windows?
Didn't understand this part, the existing syntax is
"mapred.child.env=MY_PATH=/tmp", is that how you set vars on Windows?
> Fix child task environment variable config and add support for Windows
> ----------------------------------------------------------------------
>
> Key: MAPREDUCE-4374
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4374
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 1-win
> Reporter: Chuan Liu
> Assignee: Chuan Liu
> Priority: Minor
> Attachments: MAPREDUCE-4374-branch-1-win.patch
>
>
> In HADOOP-2838, a new feature was introduced to set environment variables via
> the Hadoop config 'mapred.child.env' for child tasks. There are some further
> fixes and improvements around this feature, e.g. HADOOP-5981 were a bug fix;
> MAPREDUCE-478 broke the config into 'mapred.map.child.env' and
> 'mapred.reduce.child.env'. However the current implementation is still not
> complete. It does not match its documentation or original intend as I
> believe. Also, by using ‘:’ (colon) and ‘;’ (semicolon) in the configuration
> syntax, we will have problems using them on Windows because ‘:’ appears very
> often in Windows path as in “C:\”, and environment variables are used very
> often to hold path names. The Jira is created to fix the problem and provide
> support on Windows.
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