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https://issues.apache.org/jira/browse/HDFS-3723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy closed HDFS-3723.
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> 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
> Fix For: 3.0.0, 2.0.2-alpha
>
> Attachments: HDFS-3723.001.patch, HDFS-3723.001.patch,
> HDFS-3723.002.patch, HDFS-3723.003.patch, HDFS-3723.patch, HDFS-3723.patch,
> HDFS-3723.patch
>
>
> 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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