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https://issues.apache.org/jira/browse/YARN-6830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16153924#comment-16153924
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Allen Wittenauer commented on YARN-6830:
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Rather than fight with a regex why not redefine the API instead?
bq. When running the MR job, these environment variables are supplied as a
comma delimited string.
bq. -Dmapreduce.map.env="MODE=bar,IMAGE_NAME=foo,MOUNTS=/tmp/foo,/tmp/bar"
-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.
> Support quoted strings for environment variables
> ------------------------------------------------
>
> Key: YARN-6830
> URL: https://issues.apache.org/jira/browse/YARN-6830
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Shane Kumpf
> Assignee: Shane Kumpf
> Attachments: YARN-6830.001.patch
>
>
> There are cases where it is necessary to allow for quoted string literals
> within environment variables values when passed via the yarn command line
> interface.
> For example, consider the follow environment variables for a MR map task.
> {{MODE=bar}}
> {{IMAGE_NAME=foo}}
> {{MOUNTS=/tmp/foo,/tmp/bar}}
> When running the MR job, these environment variables are supplied as a comma
> delimited string.
> {{-Dmapreduce.map.env="MODE=bar,IMAGE_NAME=foo,MOUNTS=/tmp/foo,/tmp/bar"}}
> In this case, {{MOUNTS}} will be parsed and added to the task environment as
> {{MOUNTS=/tmp/foo}}. Any attempts to quote the embedded comma separated value
> results in quote characters becoming part of the value, and parsing still
> breaks down at the comma.
> This issue is to allow for quoting the comma separated value (escaped double
> or single quote). This was mentioned on YARN-4595 and will impact YARN-5534
> as well.
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