Jim Brennan commented on YARN-6434:

[~Jaeboo], please close this if you agree that it is resolved by 

> When setting environment variables, can't use comma for a list of value in 
> key = value pairs.
> ---------------------------------------------------------------------------------------------
>                 Key: YARN-6434
>                 URL: https://issues.apache.org/jira/browse/YARN-6434
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Jaeboo Jeong
>            Priority: Major
>         Attachments: YARN-6434-trunk.001.patch, YARN-6434.001.patch
> We can set environment variables using yarn.app.mapreduce.am.env, 
> mapreduce.map.env, mapreduce.reduce.env.
> There is no problem if we use key=value pairs like X=Y, X=$Y.
> However If we want to set key=a list of value pair(e.g. X=Y,Z), we can’t.
> This is related to YARN-4595.
> The attached patch is based on YARN-3768.
> We can set environment variables like below.
> {code}
> {code}

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