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What are the identity mapper and reducer in MapReduce?


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More MapReduce Interview Questions

Why Mapper runs in heavy weight process and not in a thread in MapReduce?

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What do you understand by the term Straggler ?

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What Are Good Use Cases For Impala As Opposed To Hive Or MapReduce?

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

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What is the difference between HDFS block and input split?

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What is MapReduce?

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How many Reducers run for a MapReduce job in Hadoop?

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Where sorting is done in Hadoop MapReduce Job?

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What do you know about nlineinputformat?

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what are the three modes in which Hadoop can be run?

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how can you debug Hadoop code?

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