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https://issues.apache.org/jira/browse/HADOOP-13341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15443878#comment-15443878
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Allen Wittenauer commented on HADOOP-13341:
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Under MS-DOS/COMMAND.EXE, environment variables are not always case sensitive.
It's going to be safer to uppercase subcommand in the env var. This also means
that hdfs NAMENODE and hdfs namenode will need to be effectively the same
command. :/
> 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_timelinereader_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
> It's worth pointing out that subcommands like distcp that sometimes need a
> higher than normal client-side heapsize or custom options are a huge win.
> Combined with .hadooprc and/or dynamic subcommands, it means users can easily
> do customizations based upon their needs without a lot of weirdo shell
> aliasing or one line shell scripts off to the side.
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