title: Yarn : Do we need nodemanager on namenode?
body: <p>Do we need to start nodemanager on a node which is namenode i.e i wont make it datanode?
  I will be starting namenode and resourcemanager on a machine. Since I wont start datanode on this machine, I think I dont need to start nodemanager as well ?</p>
  
  <p>Thank</p>