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https://issues.apache.org/jira/browse/HADOOP-13341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer updated HADOOP-13341:
--------------------------------------
    Hadoop Flags: Incompatible change

> Deprecate HADOOP_SERVERNAME_OPT; replace with HADOOP_(command)_OPT
> ------------------------------------------------------------------
>
>                 Key: HADOOP-13341
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13341
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: scripts
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Allen Wittenauer
>            Assignee: Allen Wittenauer
>
> Big features like YARN-2928 demonstrate that even senior level Hadoop 
> developers forget that daemons need a custom _OPT env var.  We can replace 
> all of the custom vars with generic handling just like we do for the username 
> check.
> For example, today:
> HADOOP_NAMENODE_OPT
> would become
> HADOOP_namenode_OPT
> But if I wanted custom distcp options, there is no equivalent.  But if the 
> command replacement mode was, then
> HADOOP_distcp_OPT
> would automatically work.
> In the case of YARN-2928, HADOOP_timelinereaderserver_OPT would automatically 
> be checked without any extra work on behalf of the contributors.



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