Error Running Collaborative Filtering Job

[Gayatri Rao]

Hi,

I have been trying to run the Hadoop Item Based Collaborative Filtering Job
as described in
https://cwiki.apache.org/confluence/display/MAHOUT/TasteCommandLine
Few MR jobs run sucessfully
((RecommenderJob-ItemIDIndexMapper-ItemIDIndexReduce,RecommenderJob-ToItemPrefsMapper-ToUserVectorReduc,RecommenderJob-CountUsersMapper-CountUsersReducer,RecommenderJob-MaybePruneRowsMapper-ToItemVectorsR)

After which the job dies with an exception


Exception in thread "main"
org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does
not exist: /data/temp/similarityMatrix
    at
org.apache.hadoop.mapreduce.lib.input.FileInputFormat.listStatus(FileInputFormat.java:224)
    at
org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat.listStatus(SequenceFileInputFormat.java:55)
    at
org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:241)
    at org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:885)
    at
org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:779)
    at org.apache.hadoop.mapreduce.Job.submit(Job.java:432)
    at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:447)
    at
org.apache.mahout.cf.taste.hadoop.item.RecommenderJob.run(RecommenderJob.java:234)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at
org.apache.mahout.cf.taste.hadoop.item.RecommenderJob.main(RecommenderJob.java:328)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:156)

I find the following files in /data/temp

[gaya...@e1aeu046110d mahout-distribution-0.4]$ hadoop dfs -ls /data/temp
Found 4 items
drwxr-xr-x   - gayatri supergroup          0 2010-12-17 16:53
/data/temp/countUsers
drwxr-xr-x   - gayatri supergroup          0 2010-12-17 16:51
/data/temp/itemIDIndex
drwxr-xr-x   - gayatri supergroup          0 2010-12-17 16:54
/data/temp/itemUserMatrix
drwxr-xr-x   - gayatri supergroup          0 2010-12-17 16:52
/data/temp/userVectors

Is this a configuration issue? I am not able to understand what might be the
error.

Thanks
Gayatri