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https://issues.apache.org/jira/browse/HADOOP-8834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13590560#comment-13590560
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Harsh J commented on HADOOP-8834:
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Hi Abhishek,
I believe the intention of this improvement report was to not print that
message at all, when no args are passed. That is, if a command will not work
with any args (has necessary args and no default substitutes), then we
shouldn't print that a user has provided wrong arguments when he passes no
arguments at all. The suggestion isn't to remove that ERROR part of the
message, which can actually stay there if we are printing it.
Let me know if this makes sense now, and thanks for working on this!
> Hadoop examples when run without an argument, gives ERROR instead of just
> usage info
> ------------------------------------------------------------------------------------
>
> Key: HADOOP-8834
> URL: https://issues.apache.org/jira/browse/HADOOP-8834
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.23.0, trunk-win
> Reporter: Robert Justice
> Assignee: Abhishek Kapoor
> Priority: Minor
> Attachments: 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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