I have a following scenario:
* Two mappers (acting on two different files) and one reducer
* The mapper code for two different files is the same, except for
minor change which depends on which file is being read
* Essentially assume there is an if statement - if first file is being
read do this else do this
So how do I provide this context to map function i.e. file name or say a
boolean flag variable indicating the file being read?