When should you use a reducer?
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More MapReduce Interview Questions
Define the Use of MapReduce?
What is shuffling and sorting in Hadoop MapReduce?
What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?
how to proceed to write your first mapreducer program?
Different ways of debugging a job in MapReduce?
What happens when the node running the map task fails before the map output has been sent to the reducer?
What is a "reducer" in Hadoop?
Why Mapreduce output written in local disk?
A number of combiners can be changed or not in MapReduce?
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Explain the general mapreduce algorithm
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