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What is the difference between Reducer and Combiner in Hadoop MapReduce?


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More MapReduce Interview Questions

What comes in Hadoop 2.0 and MapReduce V2 YARN

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How to set mappers and reducers for MapReduce jobs?

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What are ‘maps’ and ‘reduces’?

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What are the four essential parameters of a mapper?

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How does MapReduce framework view its input internally?

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MapReduce Types and Formats and Setting up a Hadoop Cluster?

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What is shuffling and sorting in Hadoop MapReduce?

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Can you tell us how many daemon processes run on a hadoop system?

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What is a combiner and where you should use it?

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What is the role of a MapReduce partitioner?

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What is a mapreduce algorithm?

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What is the InputSplit in map reduce ?

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