[jira] [Assigned] (HDFS-3723) All commands should support meaningful --help

["Jing Zhao (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-3723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jing Zhao reassigned HDFS-3723:
-------------------------------

    Assignee: Jing Zhao
    
> All commands should support meaningful --help
> ---------------------------------------------
>
>                 Key: HDFS-3723
>                 URL: https://issues.apache.org/jira/browse/HDFS-3723
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: scripts, tools
>    Affects Versions: 2.0.0-alpha
>            Reporter: E. Sammer
>            Assignee: Jing Zhao
>
> Some (sub)commands support -help or -h options for detailed help while others do not. Ideally, all commands should support meaningful help that works regardless of current state or configuration.
> For example, hdfs zkfc --help (or -h or -help) is not very useful. Option checking should occur before state / configuration checking.
> {code}
> [esammer@hadoop-fed01 ~]# hdfs zkfc --help
> Exception in thread "main" org.apache.hadoop.HadoopIllegalArgumentException: HA is not enabled for this namenode.
>         at org.apache.hadoop.hdfs.tools.DFSZKFailoverController.setConf(DFSZKFailoverController.java:122)
>         at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:66)
>         at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
>         at org.apache.hadoop.hdfs.tools.DFSZKFailoverController.main(DFSZKFailoverController.java:168)
> {code}
> This would go a long way toward better usability for ops staff.

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