[HADOOP-13697] LogLevel#main throws exception if no arguments provided

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.9.0
• Fix Version/s: 2.9.0, 3.0.0-alpha2
• Target Version/s: 2.9.0, 3.0.0-alpha2
• Hadoop Flags: Reviewed
• Assignee: Mingliang Liu
• Reporter: Mingliang Liu
• Created: 07/Oct/16 18:51
• Updated: 02/Oct/19 17:15
• Resolved: 11/Oct/16 18:26

Description

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)

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.

Issue Links

• is related to: HADOOP-12847 hadoop daemonlog should support https and SPNEGO for Kerberized cluster