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From "Akira AJISAKA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8834) Hadoop examples when run without an argument, gives ERROR instead of just usage info
Date Thu, 05 Feb 2015 00:41:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14306327#comment-14306327
] 

Akira AJISAKA commented on HADOOP-8834:
---------------------------------------

I'm thinking we should suppress error message only when no argument are set. The following
is fine for me.
{code}
    if (otherArgs.size() != 2) {
      if (!otherArgs.isEmpty()) {
         // print error message
      }
      return printUsage();
    }
{code}

> 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-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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