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


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More MapReduce Interview Questions

What is Combiner in MapReduce?

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How data is spilt in Hadoop?

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What is difference between a MapReduce InputSplit and HDFS block

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Is it possible to search for files using wildcards?

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What is identity mapper and identity reducer?

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Define Writable data types in Hadoop MapReduce?

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What are the steps involved in MapReduce framework?

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What is the data storage component used by Hadoop?

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Is it important for Hadoop MapReduce jobs to be written in Java?

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Where sorting is done on mapper node or reducer node in MapReduce?

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What is the fundamental difference between a MapReduce Split and a HDFS block?scale data processing?

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What are the four basic parameters of a reducer?

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