title: Hadoop JobClient: Error Reading task output
body: <p>I'm trying to process 40GB of Wikipedia English articles on my cluster. The problem is the following repeating error message:</p>
  
  <pre><code>13/04/27 17:11:52 INFO mapred.JobClient: Task Id : attempt_201304271659_0003_m_000046_0, Status : FAILED
  Too many fetch-failures
  13/04/27 17:11:52 WARN mapred.JobClient: Error reading task outputhttp://ubuntu:50060/tasklog?plaintext=true&amp;attemptid=attempt_201304271659_0003_m_000046_0&amp;filter=stdout
  </code></pre>
  
  <p>When I run the same MapReduce program on a smaller part of the Wikipedia articles rather than the full set, it works just fine and I get all the desired results. Based on that, I figured maybe its a memory issue. I cleared all the user logs (as specified in a similar <a href="https://stackoverflow.com/questions/2091287/error-in-hadoop-mapreduce">post</a>) and tried again. No Use.
  I turned down replication to 1 and added a few more nodes. Still no use.</p>
  
  <p>The cluster summary are as follows:</p>
  
  <ul>
  <li><strong>Configured Capacity:</strong> 205.76 GB</li>
  <li><strong>DFS Used:</strong> 40.39 GB</li>
  <li><strong>Non DFS USed:</strong> 44.66 GB</li>
  <li><strong>DFS Remaining:</strong> 120.7 GB</li>
  <li><strong>DFS Used%:</strong> 19.63%</li>
  <li><strong>DFS Remaining%:</strong> 58.66%</li>
  <li><strong>Live Nodes:</strong> 12</li>
  <li><strong>Dead Nodes:</strong> 0</li>
  <li><strong>Decomissioned Nodes:</strong> 0</li>
  <li><strong>Number of Under Replicated Blocks:</strong> 0</li>
  </ul>
  
  <p>Each node runs on <strong>Ubuntu 12.04 LTS</strong></p>
  
  <p>Any help is appreciated.</p>
  
  <p><strong>EDIT</strong></p>
  
  <p>JobTracker Log: <a href="http://txtup.co/gtBaY" rel="nofollow noreferrer">http://txtup.co/gtBaY</a></p>
  
  <p>TaskTracker Log: <a href="http://txtup.co/wEZ5l" rel="nofollow noreferrer">http://txtup.co/wEZ5l</a></p>