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From Sean Owen <sro...@gmail.com>
Subject Re: new to hadoop
Date Sun, 02 May 2010 18:01:21 GMT
--input specifies the data to use, and you have done so. It sounds
like it's empty or not in the right format. What is in
testdata/test.txt?

On Sun, May 2, 2010 at 6:48 PM, Tamas Jambor <jamborta@googlemail.com> wrote:
> 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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