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What are the four basic parameters of a reducer?


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More MapReduce Interview Questions

What is identity mapper and chain mapper?

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Explain what combiners are and when you should use a combiner in a mapreduce job?

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What is the best way to copy files between HDFS clusters?

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How does fault tolerance work in mapreduce?

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What is the difference between HDFS block and input split?

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What is OutputCommitter?

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How to set the number of reducers?

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How is Spark not quite the same as MapReduce? Is Spark quicker than MapReduce?

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Explain how do ‘map’ and ‘reduce’ work?

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Can we rename the output file?

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How to set the number of mappers for a MapReduce job?

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What is an input reader in reference to mapreduce?

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