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  1. Hadoop Common
  2. HADOOP-15914

hadoop jar command has no help argument

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 3.3.0, 3.2.1, 3.1.3
    • Component/s: common
    • Labels:
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      Description

      hadoop jar --help and hadoop jar help commands show outputs like this:

      WARNING: Use "yarn jar" to launch YARN applications.
      JAR does not exist or is not a normal file: /root/--help
      

      Only if called with no arguments: hadoop jar we get the usage text, but even in that case we get:

      WARNING: Use "yarn jar" to launch YARN applications.
      RunJar jarFile [mainClass] args...
      

      Where RunJar is wrapped by the hadoop script (so it should not be displayed).

      hadoop --help displays the following:

      jar <jar>     run a jar file. NOTE: please use "yarn jar" to launch YARN applications, not this command.
      

      which is fine, but CommandsManual.md tells a bit more information about the usage of this command:

      Usage: hadoop jar <jar> [mainClass] args...
      

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

        Attachments

        1. HADOOP-15914.000.patch
          2 kB
          Adam Antal

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            • Assignee:
              adam.antal Adam Antal
              Reporter:
              adam.antal Adam Antal
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              • Created:
                Updated:
                Resolved: