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)
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Author:James Kurose, Keith Ross
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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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