Cloudera
CCD-333 · Question #21
What happens in a MapReduce job when you set the number of reducers to zero?
The correct answer is B. No reducerexecutes, and the output of each mapper is written to a separate file in HDFS. See the full explanation below for the reasoning.
Question
What happens in a MapReduce job when you set the number of reducers to zero?
Options
- ANo reducer executes, but the mappers generate no output.
- BNo reducerexecutes, and the output of each mapper is written to a separate file in HDFS.
- CNo reducer executes, but the outputs ofall the mappers are gathered together and written to a
- DSetting the number of reducers to zero is invalid, and an exception is thrown.
How the community answered
(29 responses)- A14% (4)
- B76% (22)
- C7% (2)
- D3% (1)
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