title: Error in starting hadoop Job Tracker
body: <p>I tried to run a simple program in hadoop using Windows-Cygwin.</p>
  
  <p>I am able to start the namenode .</p>
  
  <p>The jobtracker start however fails with exception :</p>
  
  <pre><code>FATAL mapred.JobTracker: java.lang.IllegalArgumentException: Does not contain a valid host:port authority: local
          at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:162)
          at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:128)
          at org.apache.hadoop.mapred.JobTracker.getAddress(JobTracker.java:2560)
          at org.apache.hadoop.mapred.JobTracker.&lt;init&gt;(JobTracker.java:2200)
          at org.apache.hadoop.mapred.JobTracker.&lt;init&gt;(JobTracker.java:2192)
          at org.apache.hadoop.mapred.JobTracker.&lt;init&gt;(JobTracker.java:2186)
          at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:300)
          at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:291)
          at org.apache.hadoop.mapred.JobTracker.main(JobTracker.java:4978)
  </code></pre>
  
  <p>I tried all possible methods to resolve this ,but in vain. Any pointers will greatly help me.</p>
  
  <p><strong>Hdfs-site.xml  configurations :</strong></p>
  
  <pre><code> &lt;configuration&gt;&lt;br&gt;
     &lt;property&gt;
       &lt;name&gt;fs.default.name&lt; /name&gt;
       &lt;value&gt;hdfs://localhost:9100&lt;/value&gt;
     &lt;/property&gt;
     &lt;property&gt;
       &lt;name&gt;mapred.job.tracker&lt; /name&gt;
       &lt;value&gt;localhost:9101&lt; /value&gt;
     &lt;/property&gt;
     &lt;property&gt;
       &lt;name&gt;dfs.replication&lt; /name&gt;
       &lt;value&gt;1&lt;/value&gt;
     &lt;/property&gt; 
   &lt;/configuration&gt;
  </code></pre>