title: Hive - How to know which execution engine I am currently using
body: <blockquote>
    <p>I want to automate my hive ETL workflow in such a way
    that I need to execute hive jobs on the basis of execution engine (Tez
    or MR) because of memory constraints.</p>
  </blockquote>
  
  <p>Would you please help, as I wanted to cross-check in-between of my whole work-flow which execution engine currently I'm dealing with.</p>
  
  <p>Thanks in advance.</p>