Question: Review Figure 11-6 and answer the following questions based on it. a. What has happened between Input and Input'? b. Assume that the values associated

Review Figure 11-6 and answer the following questions based on it.

a. What has happened between Input and Input'?

b. Assume that the values associated with each of the keys (kl, k2, etc.) are counts. What is the purpose of the Shuffle stage?

c. If the overall goal is to count the number of instances per key, what does the role of the Reduce stage have to be?

Schematic representation of MapReduce FIGURE 11-6 Map Shuffle Reduce ndu Input' kt: 3; k5: 2 k2: 2; k5: 1 k2: 1; k3: 4 k

Schematic representation of MapReduce FIGURE 11-6 Map Shuffle Reduce ndu Input' kt: 3; k5: 2 k2: 2; k5: 1 k2: 1; k3: 4 k4: 2; k5: 2 kt:3 k2: 2,1 k3: 4 k4: 2 k5: 2,1,2 R. R.

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