MapReduce

MapReduce is a programming model that allows you to process your data across an entire cluster. It provides access to high-level applications using scripts in languages such as Hive and Pig, and programming languages as Scala and Python.

MapReduce consists of Mappers and Reducers that are different scripts, which you might write, or different functions you might use when writing a MapReduce program. MapReduce makes the use of two functions.