This topic contains 0 replies, has 1 voice, and was last updated by  hyndavi 1 year, 6 months ago.

Viewing 1 post (of 1 total)
  • Author
  • #1990 Reply


    The Mapper code reads the input files as <Key,Value> pairs and emits key value pairs. The Mapper class extends MapReduceBase and implements the Mapper interface. The Mapper interface expects four generics, which define the types of the input and output key/value pairs. The first two parameters define the input key and value types, the second two define the output key and value types.
    referred from google…..

Viewing 1 post (of 1 total)
Reply To: what is the job of mapper?
Your information:


Your Name (required)

Your Email (required)


Phone No

Your Message


  • No products in the cart.