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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8834) Hadoop examples when run without an argument, gives ERROR instead of just usage info
Date Fri, 01 Mar 2013 14:29:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13590560#comment-13590560
] 

Harsh J commented on HADOOP-8834:
---------------------------------

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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