title: unable to run hadoop wordcount example?
body: <p>I am running hadoop wordcount example in single node environment on ubuntu 12.04 in vmware.
  i running the example like this:--</p>
  
  <pre><code>hadoop@master:~/hadoop$ hadoop jar hadoop-examples-1.0.4.jar wordcount    
  /home/hadoop/gutenberg/ /home/hadoop/gutenberg-output
  </code></pre>
  
  <p>i have input file at below location:</p>
  
  <pre><code>/home/hadoop/gutenberg
  </code></pre>
  
  <p>and location for output file is:</p>
  
  <pre><code>    /home/hadoop/gutenberg-output
  </code></pre>
  
  <p>when i run wordcount program i am getting following errors:--</p>
  
  <pre><code> 13/04/18 06:02:10 INFO mapred.JobClient: Cleaning up the staging area     
  hdfs://localhost:54310/home/hadoop/tmp/mapred/staging/hadoop/.staging/job_201304180554_0001       
  13/04/18 06:02:10 ERROR security.UserGroupInformation: PriviledgedActionException       
  as:hadoop cause:org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory 
  /home/hadoop/gutenberg-output already exists 
  org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory 
  /home/hadoop/gutenberg-output already exists at 
  
  org.apache.hadoop.mapreduce.lib.output.FileOutputFormat.checkOutputSpecs(FileOutputFormat.j 
  ava:137) at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:887) at 
  org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:850) at 
  java.security.AccessController.doPrivileged(Native Method) at 
  javax.security.auth.Subject.doAs(Subject.java:416) at 
  org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121) at   
  org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:850) at  
  org.apache.hadoop.mapreduce.Job.submit(Job.java:500) at  
  org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:530) at 
  org.apache.hadoop.examples.WordCount.main(WordCount.java:67) at 
  sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at 
  sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at 
  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
  at java.lang.reflect.Method.invoke(Method.java:616) at 
  org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68) 
  at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139) at 
  org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64) 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:616) at   
  org.apache.hadoop.util.RunJar.main(RunJar.java:156) hadoop@master:~/hadoop$ bin/stop-
  all.sh Warning: $HADOOP_HOME is deprecated. stopping jobtracker localhost: stopping   
  tasktracker stopping namenode localhost: stopping datanode localhost: stopping 
  secondarynamenode    hadoop@master:~/hadoop$
  </code></pre>