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what is "map" and what is "reducer" in Hadoop?
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More MapReduce Interview Questions
What is identity mapper and identity reducer?
Why Mapper runs in heavy weight process and not in a thread in MapReduce?
What can be optimum value for Reducer?
Explain how do ‘map’ and ‘reduce’ work?
What is sqoop in Hadoop ?
How can we control particular key should go in a specific reducer?
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