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https://issues.apache.org/jira/browse/MAPREDUCE-6244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14308237#comment-14308237
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Akira AJISAKA commented on MAPREDUCE-6244:
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bq. We should inspect all job to make their behavior consistent. My thought is
that it's enough to print usages when the number of given arguments are wrong.
I'm okay with just printing usages. Consistency is more important.
> Hadoop examples when run without an argument, gives ERROR instead of just
> usage info
> ------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6244
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6244
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Affects Versions: 0.23.0, trunk-win, 2.6.0
> Reporter: Robert Justice
> Assignee: Abhishek Kapoor
> Priority: Minor
> Attachments: HADOOP-8834.patch, HADOOP-8834.patch
>
>
> Hadoop sort example should not give an ERROR and only should display usage
> when run with no parameters.
> {code}
> $ hadoop jar /usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar sort
> ERROR: Wrong number of parameters: 0 instead of 2.
> sort [-m <maps>] [-r <reduces>] [-inFormat <input format class>] [-outFormat
> <output format class>] [-outKey <output key class>] [-outValue <output value
> class>] [-totalOrder <pcnt> <num samples> <max splits>] <input> <output>
> 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|jobtracker:port> specify a job tracker
> -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
> bin/hadoop command [genericOptions] [commandOptions]
> {code}
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