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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:
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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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