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The "DataGeneratorHadoop" page has been changed by RobStewart.
http://wiki.apache.org/pig/DataGeneratorHadoop?action=diff&rev1=3&rev2=4

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  export HADOOP_CLASSPATH=$pigjar:$zipfjar:$datagenjar
  
+ ===== For Hadoop 0.18 =====
  hadoop jar -libjars $zipfjar $datagenjar 
org.apache.pig.test.utils.datagen.DataGenerator -conf $conf_file [options] 
colspec...
+ 
+ ===== For Hadoop 0.20 or Greater =====
+ hadoop jar $datagenjar org.apache.pig.test.utils.datagen.DataGenerator 
-libjars $zipfjar -conf $conf_file [options] colspec..
  
      * options:
          * -m:  number of mappers to run concurrently to generate data. If not 
configured or equal to 0, it runs in local mode.

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