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https://issues.apache.org/jira/browse/HADOOP-13697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15556004#comment-15556004
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Wei-Chiu Chuang commented on HADOOP-13697:
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Good catch [~liuml07]. The exception is already caught is main() and rethrown.
I think the exception should not be rethrown. Instead, print the error message
and return an error code.
> 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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