[MAPREDUCE-6244] Hadoop examples when run without an argument, gives ERROR instead of just usage info

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 0.23.0, trunk-win, 2.6.0
• Assignee: Abhishek Kapoor
• Reporter: Robert Justice
• Created: 21/Sep/12 14:40
• Updated: 09/Feb/15 19:00

Description

Hadoop sort example should not give an ERROR and only should display usage when run with no parameters.

$ 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&gt;] [-outFormat <output format class&gt;] [-outKey <output key class&gt;] [-outValue <output value class&gt;] [-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]