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From "Jim Brennan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8071) Provide Spark-like API for setting Environment Variables to enable vars with commas
Date Wed, 28 Mar 2018 15:12:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16417505#comment-16417505
] 

Jim Brennan commented on YARN-8071:
-----------------------------------

@jlowe, I've filed [MAPREDUCE-7069] for addressing the mapreduce properties.  I will use this
one to address the yarn properties.


> Provide Spark-like API for setting Environment Variables to enable vars with commas
> -----------------------------------------------------------------------------------
>
>                 Key: YARN-8071
>                 URL: https://issues.apache.org/jira/browse/YARN-8071
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: yarn
>    Affects Versions: 3.0.0
>            Reporter: Jim Brennan
>            Assignee: Jim Brennan
>            Priority: Major
>
> YARN-6830 describes a problem where environment variables that contain commas cannot
be specified via {{-Dmapreduce.map.env}}.
> For example:
> {{-Dmapreduce.map.env="MODE=bar,IMAGE_NAME=foo,MOUNTS=/tmp/foo,/tmp/bar"}}
> will set {{MOUNTS}} to {{/tmp/foo}}
> In that Jira, [~aw] suggested that we change the API to provide a way to specify environment
variables individually, the same way that Spark does.
> {quote}Rather than fight with a regex why not redefine the API instead?
>  
> -Dmapreduce.map.env.MODE=bar
>  -Dmapreduce.map.env.IMAGE_NAME=foo
>  -Dmapreduce.map.env.MOUNTS=/tmp/foo,/tmp/bar
> ...
> e.g, mapreduce.map.env.[foo]=bar gets turned into foo=bar
> This greatly simplifies the input validation needed and makes it clear what is actually
being defined.
> {quote}



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