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https://issues.apache.org/jira/browse/HADOOP-9642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14378721#comment-14378721
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Allen Wittenauer commented on HADOOP-9642:
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Linking HADOOP-11553. If both get committed, the docs should reference this
functionality.
> Configuration to resolve environment variables via ${env.VARIABLE} references
> -----------------------------------------------------------------------------
>
> Key: HADOOP-9642
> URL: https://issues.apache.org/jira/browse/HADOOP-9642
> Project: Hadoop Common
> Issue Type: Improvement
> Components: conf, scripts
> Affects Versions: 3.0.0, 2.1.0-beta
> Reporter: Steve Loughran
> Assignee: Kengo Seki
> Priority: Minor
> Attachments: HADOOP-9642.001.patch, HADOOP-9642.002.patch
>
>
> We should be able to get env variables from Configuration files, rather than
> just system properties. I propose using the traditional {{env}} prefix
> {{${env.PATH}}} to make it immediately clear to people reading a conf file
> that it's an env variable -and to avoid any confusion with system properties
> and existing configuration properties.
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