Q. What is the primary function of the Hadoop MapReduce "Map-side Aggregation" technique?
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(A)
Aggregate values on the mapper side
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(B)
Combine intermediate key-value pairs on the mapper side
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(C)
Sort and shuffle data
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(D)
Distribute data to reducers
✅ Correct Answer: (B)
Combine intermediate key-value pairs on the mapper side