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Exam Code: CCD-410
Exam Name: Cloudera Certified Developer for Apache Hadoop (CCDH)
Q&As: 60
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Pass4itsure Latest and Most Accurate Cloudera CCD-410 Dumps Exam Q&As:
QUESTION 1
When is the earliest point at which the reduce method of a given Reducer can be called?
A. As soon as at least one mapper has finished processing its input split.
B. As soon as a mapper has emitted at least one record.
C. Not until all mappers have finished processing all records.
D. It depends on the InputFormat used for the job.
CCD-410 exam Correct Answer: C
Explanation
Explanation/Reference:
In a MapReduce job reducers do not start executing the reduce method until the all Map jobs have
completed. Reducers start copying intermediate key-value pairs from the mappers as soon as they are
available. The programmer defined reduce method is called only after all the mappers have finished.