[HADOOP-13361] Modify hadoop_verify_user to be consistent with hadoop_subcommand_opts (ie more granularity) - ASF JIRA

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Hadoop Flags:

Incompatible change
Release Note:

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Users:

In Apache Hadoop 3.0.0-alpha1, verification required environment variables with the format of HADOOP_(subcommand)_USER where subcommand was lowercase applied globally. This changes the format to be (command)_(subcommand)_USER where all are uppercase to be consistent with the _OPTS functionality as well as being able to set per-command options. Additionally, the check is now happening sooner, which should make it faster to fail.

Developers:

This changes hadoop_verify_user to require the program's name as part of the function call. This is incompatible with Apache Hadoop 3.0.0-alpha1.

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Users: In Apache Hadoop 3.0.0-alpha1, verification required environment variables with the format of HADOOP_(subcommand)_USER where subcommand was lowercase applied globally. This changes the format to be (command)_(subcommand)_USER where all are uppercase to be consistent with the _OPTS functionality as well as being able to set per-command options. Additionally, the check is now happening sooner, which should make it faster to fail. Developers: This changes hadoop_verify_user to require the program's name as part of the function call. This is incompatible with Apache Hadoop 3.0.0-alpha1.

hadoop_verify_user should be consistent with hadoop_subcommand_opts so that it looks/feels the same to end users.