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What Is Map Reduce? Hire Map Reduce Expert

Map: Parallelize processing on different chunks of data stored on different nodes

  • The processing function is cloned and ‘mapped’ to each data chunk to key-value pairs

  • Translation: Breaking down the elements to key-value pairs. There can be many of the same keys

  • For example, the processing function keeps a tally of the number of occurrences of every word in the doc

Reduce: Consolidating the results of each mapping function into a common unit

  • The final output might be a tally of the occurrence of each word in all the documents

  • Translation: Adding the values of the key-value pairs in the Map task based on the keys

Intermediate Step: shuffling and sorting the results produced by each mapping function.

  • E.g. all words from all the documents that start with ‘a’ to ‘g’ go to one intermediate unit, all words that start with ‘h’ to ‘p’ go to another, and so on, and then they are sorted alphabetically.

MapReduce Example #1

  • Given this variable:

  • some_string = “Deer, Bear, River, Car, Car, River, Deer, Car and Bear”

MapReduce Example #2

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