Map/Reduce Technique

Created: 2014/04/26 ; Modified: 2014/06/20

Hadoop uses the Map/Reduce technique to create tasks that can be executed independently and concurrently one from another.

You can download the document shown in this video.

In this video:

  • Examples of processes (00:16)
    • Count the occurrences of a word in a text.
    • Count the number of visitors per website page.
    • Count the amount of pages that each visitor looked at.
  • Input (01:08)
  • Breaking into tasks (01:27)
  • Map (02:11)
  • Reduce (03:24)
  • Java Code (06:59)