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Posted to mapreduce-issues@hadoop.apache.org by "Ivan Mitic (JIRA)" <ji...@apache.org> on 2012/06/28 04:10:43 UTC
[jira] [Commented] (MAPREDUCE-4374) Fix child task environment
variable config and add support for Windows
[ https://issues.apache.org/jira/browse/MAPREDUCE-4374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402782#comment-13402782 ]
Ivan Mitic commented on MAPREDUCE-4374:
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+1, change looks good to me. Agree on your points for using '%' and ';' 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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