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What is Mapper in Hadoop MapReduce?


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More MapReduce Interview Questions

What is Output Format in MapReduce?

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How to get the single file as the output from MapReduce Job?

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What is difference between a MapReduce InputSplit and HDFS block

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How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?

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Explain the Reducer's reduce phase?

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

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What is the difference between HDFS block and input split?

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What is the need of MapReduce in Hadoop?

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What are the disservices of utilizing Apache Spark over Hadoop MapReduce?

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Explain task granularity

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What are mapreduce new and old apis while writing map reduce program?. Explain how it works

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Explain the general mapreduce algorithm

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