title: Hadoop Namenode not starting
body: <p>I am getting java.io.IOException: Failed to load an FSImage file while starting Namenode</p>
  
  <pre><code>ERROR org.apache.hadoop.hdfs.server.namenode.FSImage: Failed to load image from FSImageFile(file=/opt1/dfs/nn/current/fsimage_0000000000023479779, cpktTxId=0000000000023479779)
  java.io.IOException: Unexpected block size: -1945969516689645797
  
  java.io.IOException: Failed to load an FSImage file!
  </code></pre>
  
  <p>And namenode is not getting started because of this. 
  I have 1 namenode, 1 seconday namenode and 3 datanodes in my cluster.</p>
  
  <p>Can someone help me recover my cluster.</p>