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Provide context to map function

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?