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Question 2: You've written a MapReduce job that will process 500 million input records and generated 500
million key-value pairs. The data is not uniformly distributed. Your MapReduce job will create a
significant amount of intermediate data that it needs to transfer between mappers and reduces
which is a potential bottleneck. A custom implementation of which interface is most likely to reduce
the amount of intermediate data transferred across the network?
A. Partitioner
B. OutputFormat
C. WritableComparable
D. Writable
E. InputFormat
F. Combiner
Correct Answer: F
Explanation:
Combiners are used to increase the efficiency of a MapReduce program. They are used to aggregate
intermediate map output locally on individual mapper outputs. Combiners can help you reduce the
amount of data that needs to be transferred across to the reducers. You can use your reducer code
as a combiner if the operation performed is commutative and associative.
Reference: 24 Interview Questions & Answers for Hadoop MapReduce developers, What are
combiners? When should I use a combiner in my MapReduce Job?
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