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What are the identity mapper and reducer in MapReduce?


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More MapReduce Interview Questions

What is the InputSplit in map reduce ?

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List out Hadoop's three configuration files?

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What is the input type/format in MapReduce by default?

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What is heartbeat in hdfs? Explain.

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What are the steps involved in MapReduce framework?

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How does Mappers run method works?

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What is the difference between an RDBMS and Hadoop?

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how to proceed to write your first mapreducer program?

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Explain InputSplit in Hadoop MapReduce?

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Mention when to use Map reduce mode?

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What is a RecordReader in Hadoop MapReduce?

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how can you debug Hadoop code?

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