Mention what is the hadoop mapreduce apis contract for a key and value class?

671

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

608

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What is the function of mapreduce partitioner?

635

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

594

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Explain what is “map” and what is "reducer" in hadoop?

638

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Explain what does the conf.setmapper class do?

606

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Explain what are the basic parameters of a mapper?

802

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Mention what is the next step after mapper or maptask?

626

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Explain what is shuffling in mapreduce?

620

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Explain what is distributed cache in mapreduce framework?

614

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Mention what are the main configuration parameters that user need to specify to run mapreduce job?

729

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Explain what is the function of mapreduce partitioner?

637

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Explain what is heartbeat in hdfs?

35

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Explain what is a difference between an input split and hdfs block?

31

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Explain how indexing in hdfs is done?

38

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