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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13697) LogLevel#main throws exception if no arguments provided
Date Fri, 07 Oct 2016 18:52:20 GMT
Mingliang Liu created HADOOP-13697:
--------------------------------------

             Summary: LogLevel#main throws exception if no arguments provided
                 Key: HADOOP-13697
                 URL: https://issues.apache.org/jira/browse/HADOOP-13697
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 2.9.0
            Reporter: Mingliang Liu
            Assignee: Mingliang Liu


{code}
root@b9ab37566005:/# hadoop daemonlog

Usage: General options are:
	[-getlevel <host:port> <classname> [-protocol (http|https)]
	[-setlevel <host:port> <classname> <level> [-protocol (http|https)]

Exception in thread "main" org.apache.hadoop.HadoopIllegalArgumentException: No arguments
specified
	at org.apache.hadoop.log.LogLevel$CLI.parseArguments(LogLevel.java:138)
	at org.apache.hadoop.log.LogLevel$CLI.run(LogLevel.java:106)
	at org.apache.hadoop.log.LogLevel.main(LogLevel.java:70)
{code}

I think we can catch the exception in the main method, and dump a log error message instead
of throw the stack which may frustrate users.



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