EMERGING TRENDS IN SOFTWARE ENGINEERING
CLOUD COMPUTING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Consider the pseudo-code for MapReduce’s WordCount example (not shown here). Let’s now assume that you want to determine the frequency of phrases consisting of 3 words each instead of determining the frequency of single words. Which part of the pseudo-code do you need to adapt?
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Only map()
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Only reduce()
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Both map() and reduce()
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The code does not have to be changed
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Explanation:
Detailed explanation-1: -Accepted Answers: For which of the following operations is NO communication with the NameNode required? A client writing a file to HDFS.
Detailed explanation-2: -If we set the number of Reducer to 0 (by setting job. setNumreduceTasks(0)), then no reducer will execute and no aggregation will take place. In such case, we will prefer “Map-only job” in Hadoop. In Map-Only job, the map does all task with its InputSplit and the reducer do no job.
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