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Differentiate Reducer and Combiner in Hadoop MapReduce?


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More MapReduce Interview Questions

What is a map side join?

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What is MapReduce? What are the syntax you use to run a MapReduce program?

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When Namenode is down what happens to job tracker?

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What are ‘maps’ and ‘reduces’?

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what is NameNode in Hadoop?

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What is the role of a MapReduce partitioner?

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How to optimize Hadoop MapReduce Job?

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What is the fundamental difference between a MapReduce InputSplit and HDFS block?

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What is optimal size of a file for distributed cache?

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Compare RDBMS with Hadoop MapReduce.

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What do you mean by shuffling and sorting in MapReduce?

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What is the difference between a MapReduce InputSplit and HDFS block?

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