E. Sammer created HDFS-3723:
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Summary: 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
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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