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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13341) Deprecate HADOOP_SERVERNAME_OPT; replace with HADOOP_(command)_OPT
Date Fri, 08 Jul 2016 14:34:11 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15367742#comment-15367742

Allen Wittenauer commented on HADOOP-13341:

Turning this into an umbrella JIRA, will do the work in a branch.

> 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:
> 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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