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Cloudera Cloudera Certified Developer for Apache Hadoop (CCDH)
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Question #1
#1
Multiple Choice
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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.
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Exam CCD-410 Topic 1 Question 1
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