title: difference between hadoop mr1 and yarn and mr2?
body: <p>Can someone pls tell what is the differece between MR1 and yarn and MR2</p>
  
  <p>My understanding is MR1 will be having below components
  Namenode,
  secondary name node,
  datanode,
  job tracker,
  task tracker</p>
  
  <p>Yarn
  Node manager
  Resource Manager</p>
  
  <p>Is Yarn consists of MR1 or MR2 ( or both MR2 and Yarn are same?)</p>
  
  <p>sorry if i asked basic level question</p>