An Introduction to the Map Reduce Framework of the Hadoop. A demo of the Word Count Example.

1. Map Reduce

2. Map Reduce Overview
• Tasks are distributed to multiple nodes
• Each node processes the data stored in that node
• Consists of two phase:
• Map – Reads input data and output intermediate
keys and values
• Reduce – Values with the same key are sent to
the same reducer for further processing

3. Map Reduce

4. HELLO WORLD
Word Count

5. Mapper

6. Reducer

7. Shuffle and Sort
Reduce
Reduce
Map
Map
Map
Map

8. Thank You !!