title: When to go for custom Input format for Map reduce jobs
body: <p>When should we go for custom Input Format while using Map Reduce programming ?</p>
  
  <p>Say I have a file which I need to read line by line and it has 15 columns delimited by pipe, should I go for custom Input Format ? </p>
  
  <p>I can use a TextInput Format as well as Custom Input Format in this case.</p>