[jira] [Updated] (MAPREDUCE-4374) Fix child task environment variable config and add support for Windows

["Allen Wittenauer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4374?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Allen Wittenauer updated MAPREDUCE-4374:
----------------------------------------
    Fix Version/s:     (was: 3.0.0)

> 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
>          Components: mrv2
>    Affects Versions: 3.0.0, 1-win, 2.1.0-beta
>            Reporter: Chuan Liu
>            Assignee: Chuan Liu
>            Priority: Minor
>             Fix For: 1-win, 2.1.0-beta
>
>         Attachments: MAPREDUCE-4374-branch-1-win-2.patch, MAPREDUCE-4374-branch-1-win.patch, MAPREDUCE-4374-trunk.2.patch, MAPREDUCE-4374-trunk.3.patch, MAPREDUCE-4374-trunk.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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