Steve Loughran created HADOOP-9642:
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Summary: Configuration to resolve environment variables via
${env.VARIABLE} references
Key: HADOOP-9642
URL: https://issues.apache.org/jira/browse/HADOOP-9642
Project: Hadoop Common
Issue Type: Improvement
Components: conf
Affects Versions: 3.0.0, 2.1.0-beta
Reporter: Steve Loughran
Priority: Minor
We should be able to get env variables from Configuration files, rather than
just system properties. I propose using the traditional {{env}} prefix
{{${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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