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CCD-410 · Question #20
CCD-410 Question #20: Real Exam Question with Answer & Explanation
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Question
In the reducer, the MapReduce API provides you with an iterator over Writable values. What does calling the next () method return?
Options
- AIt returns a reference to a different Writable object time.
- BIt returns a reference to a Writable object from an object pool.
- CIt returns a reference to the same Writable object each time, but populated with different data.
- DIt returns a reference to a Writable object. The API leaves unspecified whether this is a reused object
- EIt returns a reference to the same Writable object if the next value is the same as the previous value,
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