[jira] [Created] (HADOOP-15914) hadoop jar command has no help argument

["Adam Antal (JIRA)" <ji...@apache.org>]

Adam Antal created HADOOP-15914:
-----------------------------------

             Summary: hadoop jar command has no help argument
                 Key: HADOOP-15914
                 URL: https://issues.apache.org/jira/browse/HADOOP-15914
             Project: Hadoop Common
          Issue Type: Improvement
          Components: common
            Reporter: Adam Antal


{{hadoop jar --help}} and {{hadoop jar help}} commands show outputs like this:
{noformat}
WARNING: Use "yarn jar" to launch YARN applications.
JAR does not exist or is not a normal file: /root/--help
{noformat}
Only if called with no arguments: {{hadoop jar}} we get the usage text, but even in that case we get:
{noformat}
WARNING: Use "yarn jar" to launch YARN applications.
RunJar jarFile [mainClass] args...
{noformat}
Where RunJar is wrapped by the hadoop script (so it should not be displayed).

{{hadoop --help}} displays the following:
{noformat}
jar <jar>     run a jar file. NOTE: please use "yarn jar" to launch YARN applications, not this command.
{noformat}
which is fine, but {{CommandsManual.md}} tells a bit more information about the usage of this command:
{noformat}
Usage: hadoop jar <jar> [mainClass] args...
{noformat}

My suggestion is to add a {{--help}} option to the {{hadoop jar}} command that would display this message.



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