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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13341) Deprecate HADOOP_SERVERNAME_OPTS; replace with (command)_(subcommand)_OPTS
Date Fri, 08 Jul 2016 16:06:11 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer updated HADOOP-13341:
--------------------------------------
    Summary: Deprecate HADOOP_SERVERNAME_OPTS; replace with (command)_(subcommand)_OPTS  (was:
Deprecate HADOOP_SERVERNAME_OPTS; replace with HADOOP_(subcommand)_OPTS)

> Deprecate HADOOP_SERVERNAME_OPTS; replace with (command)_(subcommand)_OPTS
> --------------------------------------------------------------------------
>
>                 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 _OPTS env var.  We can replace all of the custom vars with generic
handling just like we do for the username check.
> For example, with generic handling in place:
> || Old Var || New Var ||
> | HADOOP_NAMENODE_OPTS | HDFS_namenode_OPTS |
> | YARN_RESOURCEMANAGER_OPTS | YARN_resourcemanager_OPTS |
> | n/a | YARN_timelineserverreader_OPTS |
> | n/a | HADOOP_distcp_OPTS |
> | n/a | MAPRED_distcp_OPTS |
> This makes it:
> a) consistent across the entire project
> b) consistent for every subcommand
> c) eliminates almost all of the custom appending in the case statements



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