title: Running hadoop jobs on Amazon ec2: multi node cluster
body: <p>I have to run hadoop mapreduce jobs on Amazon EC2 cluster.</p>
  
  <p>I tried the setup using existing AMI's. But after starting master and clients "jps" doesn't list any nodes.</p>
  
  <p>SO even after using the public hadoop AMI do we have to do the hadoop setup for masters and slaves? How will master know the IP address of slaves??</p>
  
  <p>Can anyone please direct me to some good documents.
  I am banging my head on this for more than 12 hrs now.</p>
  
  <p>Can anyone please help?</p>
  
  <p>Thanks.</p>