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From Tamas Jambor <jambo...@googlemail.com>
Subject new to hadoop
Date Sun, 02 May 2010 17:48:46 GMT
hi,

I have just started exploring the distributed version of mahout. I 
wanted to start with running the example job as follows:

  hadoop jar mahout-core-0.3.job 
org.apache.mahout.cf.taste.hadoop.item.RecommenderJob --input 
testdata/test.txt --output output --tempDir temp --jarFile 
mahout-core-0.3.jar

but I couldn't find a parameter where I can specify the data set the 
recommender will use. I assume this is the reason why the job fails:

10/05/02 18:40:15 INFO mapred.JobClient: Task Id : 
attempt_201004291158_0018_m_000001_2, Status : FAILED
java.lang.ArrayIndexOutOfBoundsException: 1
         at 
org.apache.mahout.cf.taste.hadoop.item.ItemIDIndexMapper.map(ItemIDIndexMapper.java:42)
         at 
org.apache.mahout.cf.taste.hadoop.item.ItemIDIndexMapper.map(ItemIDIndexMapper.java:31)
         at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
         at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
         at org.apache.hadoop.mapred.Child.main(Child.java:170)

thanks

Tamas

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