title: Hadoop 2.x -- how to configure secondary namenode?
body: <p>I have an old Hadoop install that I'm looking to update to Hadoop 2. In the
  old setup, I have a $HADOOP_HOME/conf/masters file that specifies the
  secondary namenode.</p>
  
  <p>Looking through the Hadoop 2 documentation I can't find any mention of a
  "masters" file, or how to setup a secondary namenode.</p>
  
  <p>Any help in the right direction would be appreciated.</p>