title: java.io.IOException: Lease timeout of 0 seconds expired
body: <p>I'm getting the following warning while running my mapreduce jobs under cd4. </p>
  
  <blockquote>
    <p>java.io.IOException: Lease timeout of 0 seconds expired.
            at org.apache.hadoop.hdfs.DFSOutputStream.abort(DFSOutputStream.java:1700)
            at org.apache.hadoop.hdfs.DFSClient.closeAllFilesBeingWritten(DFSClient.java:652)
            at org.apache.hadoop.hdfs.DFSClient.renewLease(DFSClient.java:604)
            at org.apache.hadoop.hdfs.LeaseRenewer.renew(LeaseRenewer.java:411)
            at org.apache.hadoop.hdfs.LeaseRenewer.run(LeaseRenewer.java:436)
            at org.apache.hadoop.hdfs.LeaseRenewer.access$700(LeaseRenewer.java:70)
            at org.apache.hadoop.hdfs.LeaseRenewer$1.run(LeaseRenewer.java:297)
            at java.lang.Thread.run(Thread.java:662)</p>
  </blockquote>
  
  <p>Any idea what this means?</p>