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For a map reduce job that does word count. Which of the following statements is correct? Select one: a. The mapper can only output one key value pair for each unique word. o b. The mapper first groups the data by word before emitting the data. The aggregation can be done in both the mapper and reducer. d. The reducer always performs all the aggregation.

For a map reduce job that does word count. Which of the following statements is correct? Select one: a. The mapper can only output one key value pair for each unique word. o b. The mapper first groups the data by word before emitting the data. The aggregation can be done in both the mapper and reducer. d. The reducer always performs all the aggregation.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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For a map reduce job that does word count. Which of the following statements is correct? Select one: a. The mapper can only output one key value pair for each unique word. O b. The mapper first groups the data by word before emitting the data. The aggregation can be done in both the mapper and reducer. d. The reducer always performs all the aggregation.
Transcribed Image Text:For a map reduce job that does word count. Which of the following statements is correct? Select one: a. The mapper can only output one key value pair for each unique word. O b. The mapper first groups the data by word before emitting the data. The aggregation can be done in both the mapper and reducer. d. The reducer always performs all the aggregation.
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