title: Trouble with Hadoop RecommenderJob
body: <p>I have added my input files 'input.txt' and 'users.txt' to HDFS successfully.  I have tested Hadoop and Mahout jobs separately with success.  However, when I go to run a RecommenderJob with the following command line:</p>
  
  <blockquote>
    <p>bin/hadoop jar /Applications/mahout-distribution-0.9/mahout-core-0.9-job.jar org.apache.mahout.cf.taste.hadoop.item.RecommenderJob -Dmapred.input.dir=/user/valtera45/input/input.txt -Dmapred.output.dir=/user/valtera45/output
    --usersFile /user/valtera45/input2/users.txt --similarityClassname SIMILARITY_COOCCURRENCE</p>
  </blockquote>
  
  <p>This is the output I get:</p>
  
  <blockquote>
    <p>Exception in thread "main" java.io.IOException: Cannot open filename /user/valtera45/temp/preparePreferenceMatrix/numUsers.bin
        at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.openInfo(DFSClient.java:1444)
        at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.(DFSClient.java:1435)
        at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:347)
        at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:178)
        at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:351)
        at org.apache.mahout.common.HadoopUtil.readInt(HadoopUtil.java:339)
        at org.apache.mahout.cf.taste.hadoop.item.RecommenderJob.run(RecommenderJob.java:172)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
        at org.apache.mahout.cf.taste.hadoop.item.RecommenderJob.main(RecommenderJob.java:322)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:156)</p>
  </blockquote>
  
  <p>Whenever I run a standalone Mahout job, a temp folder gets created within the Mahout directory.  The RecommenderJob can't seem to get past this step.  Any ideas?  Thanks in advance.  I know the input files I am using are well formatted because they have worked successfully for others. </p>