title: Error in running Hadoop example on single node cluster
body: <p>I'm running the word count example provided by hadoop. The following is the error that i am getting:</p>
  
  <pre><code>-bash-4.1$ ./hadoop jar /home/chanders/Hadoop/bin/hadoop-examples-0.20.203.0.jar wordcount /usr/temp_hadoop /usr/output
  Warning: Maximum heap size rounded up to 1024 MB
  Warning: Maximum heap size rounded up to 1024 MB
  Exception in thread "main" java.io.IOException: Error opening job jar: /home/chanders/Hadoop/bin/hadoop-examples-0.20.203.0.jar
      at org.apache.hadoop.util.RunJar.main(RunJar.java:90)
  Caused by: java.util.zip.ZipException: error in opening zip file
      at java.util.zip.ZipFile.open(Native Method)
      at java.util.zip.ZipFile.&lt;init&gt;(ZipFile.java:129)
      at java.util.jar.JarFile.&lt;init&gt;(JarFile.java:141)
      at java.util.jar.JarFile.&lt;init&gt;(JarFile.java:78)
      at org.apache.hadoop.util.RunJar.main(RunJar.java:88)
  -bash-4.1$ ^C
  -bash-4.1$ ./hadoop jar /home/chanders/Hadoop/bin/hadoop*examples*.jar wordcount /usr/temp_hadoop /usr/output
  Warning: Maximum heap size rounded up to 1024 MB
  Warning: Maximum heap size rounded up to 1024 MB
  Exception in thread "main" java.io.IOException: Error opening job jar: /home/chanders/Hadoop/bin/hadoop*examples*.jar
      at org.apache.hadoop.util.RunJar.main(RunJar.java:90)
  Caused by: java.util.zip.ZipException: error in opening zip file
      at java.util.zip.ZipFile.open(Native Method)
      at java.util.zip.ZipFile.&lt;init&gt;(ZipFile.java:129)
      at java.util.jar.JarFile.&lt;init&gt;(JarFile.java:141)
      at java.util.jar.JarFile.&lt;init&gt;(JarFile.java:78)
      at org.apache.hadoop.util.RunJar.main(RunJar.java:88)
  </code></pre>
  
  <p>Information about my installation: I followed the installation instructions from Michaeal Noll's link <a href="http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/" rel="nofollow">Here</a> 
  The only change is that i havent created a separate hadoop user. I'm using it under my login.  </p>