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CCD-410 · Question #27
CCD-410 Question #27: Real Exam Question with Answer & Explanation
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Question
When can a reduce class also serve as a combiner without affecting the output of a MapReduce program?
Options
- AWhen the types of the reduce operation's input key and input value match the types of the reducer's output
- BWhen the signature of the reduce method matches the signature of the combine method.
- CAlways. Code can be reused in Java since it is a polymorphic object-oriented programming language.
- DAlways. The point of a combiner is to serve as a mini-reducer directly after the map phase to increase
- ENever. Combiners and reducers must be implemented separately because they serve different purposes.
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