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what is "map" and what is "reducer" in Hadoop?
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How is mapreduce related to cloud computing?
What is a MapReduce Combiner?
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What are the advantages of using mapreduce with hadoop?
What happens when the node running the map task fails before the map output has been sent to the reducer?
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Explain the features of Apache Spark because of which it is superior to Apache MapReduce?
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