Jian He created YARN-6393:
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Summary: Create a API class for yarn-native-service user-facing
constants
Key: YARN-6393
URL: https://issues.apache.org/jira/browse/YARN-6393
Project: Hadoop YARN
Issue Type: Sub-task
Reporter: Jian He
User can use some constants in the json input spec file for later substitution.
e.g. if user specifies $HOSTNAME in the env section of the input file, it'll be
substituted by AM with the actual host name. We'll need to create an API class
and clearly documents it.
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