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Exam CCD-410 topic 1 question 26 discussion

Actual exam question from Cloudera's CCD-410
Question #: 26
Topic #: 1
[All CCD-410 Questions]

What data does a Reducer reduce method process?

  • A. All the data in a single input file.
  • B. All data produced by a single mapper.
  • C. All data for a given key, regardless of which mapper(s) produced it.
  • D. All data for a given value, regardless of which mapper(s) produced it.
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Suggested Answer: C 🗳️
Reducing lets you aggregate values together. A reducer function receives an iterator of input values from an input list. It then combines these values together, returning a single output value.
All values with the same key are presented to a single reduce task.
Reference: Yahoo! Hadoop Tutorial, Module 4: MapReduce
by johikepe at April 5, 2025, 1:51 p.m.

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