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

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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)