[jira] [Created] (HADOOP-14202) fix jsvc/secure user inconsistencies

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[jira] [Created] (HADOOP-14202) fix jsvc/secure user inconsistencies

JIRA jira@apache.org
Allen Wittenauer created HADOOP-14202:

             Summary: fix jsvc/secure user inconsistencies
                 Key: HADOOP-14202
                 URL: https://issues.apache.org/jira/browse/HADOOP-14202
             Project: Hadoop Common
          Issue Type: Improvement
          Components: scripts
    Affects Versions: 3.0.0-alpha2
            Reporter: Allen Wittenauer
            Assignee: Allen Wittenauer

Post-HADOOP-13341 and (more importantly) HADOOP-13673, there has been a major effort on making the configuration environment variables consistent among all the projects. The vast majority of vars now look like (command)_(subcommand)_(etc). Two hold outs are HADOOP_SECURE_DN_USER  and HADOOP_PRIVILEGED_NFS_USER.

Additionally, there is

* no generic handling
* no documentation for anyone
* no safety checks to make sure things are defined

In order to fix all of this, we should:

* deprecate the previous vars using the deprecation function, updating the HDFS documentation that references them
* add generic (command)_(subcommand)_SECURE_USER support
* add some verification for the previously mentioned var
* add some docs to UnixShellGuide.md

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