[jira] [Created] (MAHOUT-1122) Mahout prints usage statement AND executes the request class which is confusing

["Clint Heath (JIRA)" <ji...@apache.org>]

Clint Heath created MAHOUT-1122:
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             Summary: Mahout prints usage statement AND executes the request class which is confusing
                 Key: MAHOUT-1122
                 URL: https://issues.apache.org/jira/browse/MAHOUT-1122
             Project: Mahout
          Issue Type: Bug
          Components: CLI
    Affects Versions: 0.7
            Reporter: Clint Heath
            Priority: Minor


We have seen an issue when running mahout on the CLI where if you do not include required arguments, the specified class still gets executed to completion, but Mahout prints a usage statement too, which is confusing.  If a required argument is missed, print usage and exit.

Here is the log:

[server~]$ mahout org.apache.mahout.clustering.syntheticcontrol.kmeans.Job -Dpool.name=analytics-pool 
MAHOUT_LOCAL is not set; adding HADOOP_CONF_DIR to classpath. 
Running on hadoop, using /usr/lib/hadoop/bin/hadoop and HADOOP_CONF_DIR=/etc/hadoop/conf 
MAHOUT-JOB: /usr/lib/mahout/mahout-examples-0.7-cdh4.1.1-job.jar 
12/11/29 00:01:37 WARN driver.MahoutDriver: No org.apache.mahout.clustering.syntheticcontrol.kmeans.Job.props found on classpath, will use command-line arguments only 
12/11/29 00:01:37 INFO kmeans.Job: Running with only user-supplied arguments 
12/11/29 00:01:38 ERROR common.AbstractJob: Missing required option --t1 
usage: <command> [Generic Options] [Job-Specific Options] 
Generic Options: 
-archives <paths> comma separated archives to be unarchived 
on the compute machines. 
-conf <configuration file> specify an application configuration file 
-D <property=value> use value for given property 
-files <paths> comma separated files to be copied to the 
map reduce cluster 
-fs <local|namenode:port> specify a namenode 
-jt <local|jobtracker:port> specify a job tracker 
-libjars <paths> comma separated jar files to include in 
the classpath. 
-tokenCacheFile <tokensFile> name of the file with the tokens 
Missing required option --t1 
Usage: 
[--input <input> --output <output> --distanceMeasure <distanceMeasure> 
--numClusters <k> --t1 <t1> --t2 <t2> --convergenceDelta <convergenceDelta> 
--maxIter <maxIter> --overwrite --help --tempDir <tempDir> --startPhase 
<startPhase> --endPhase <endPhase>] 
--t1 (-t1) t1 T1 threshold value 
12/11/29 00:01:38 INFO driver.MahoutDriver: Program took 192 ms (Minutes: 0.0032)

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