10-23. Review Figure 10-15 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 (k1, k2, and so forth) are counts. What is the pur- pose of the Shuffle stage? c. If the overall goal is to count the number of instances ter key, what does the role of the Reduce stage have to be? : 2:52 5:2.1.2 FIGURE 10-15 Schematic representation of MapReduce MapReduce: Simplified Data Processing on Large Clusters, Jeff Dean, Sanjay Ghemawat, Google, Inc, http://research.google.com/ archive/mapreduce-osdi04-slides/ index-auto-0007.html. Courtesy of the authors. 4:2 Input Input" 3:4 :1:1: 4 152 12:25 12 2:2.1 kt:3 Shuffle Reduce la 10-23. Review Figure 10-15 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 (k1, k2, and so forth) are counts. What is the pur- pose of the Shuffle stage? c. If the overall goal is to count the number of instances ter key, what does the role of the Reduce stage have to be? : 2:52 5:2.1.2 FIGURE 10-15 Schematic representation of MapReduce MapReduce: Simplified Data Processing on Large Clusters, Jeff Dean, Sanjay Ghemawat, Google, Inc, http://research.google.com/ archive/mapreduce-osdi04-slides/ index-auto-0007.html. Courtesy of the authors. 4:2 Input Input" 3:4 :1:1: 4 152 12:25 12 2:2.1 kt:3 Shuffle Reduce la