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https://issues.apache.org/jira/browse/HADOOP-13697?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mingliang Liu updated HADOOP-13697:
-----------------------------------
Attachment: HADOOP-13697.001.patch
{code}
$ hadoop daemonlog
Usage: Command options are:
[-getlevel <host:port> <classname> [-protocol (http|https)]
[-setlevel <host:port> <classname> <level> [-protocol (http|https)]
Generic options supported are
-conf <configuration file> specify an application configuration file
-D <property=value> use value for given property
-fs <local|namenode:port> specify a namenode
-jt <local|resourcemanager:port> specify a ResourceManager
-files <comma separated list of files> specify comma separated files to be
copied to the map reduce cluster
-libjars <comma separated list of jars> specify comma separated jar files to
include in the classpath.
-archives <comma separated list of archives> specify comma separated
archives to be unarchived on the compute machines.
The general command line syntax is
command [genericOptions] [commandOptions]
{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
> Attachments: HADOOP-13697.000.patch, HADOOP-13697.001.patch
>
>
> {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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