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When should you use a reducer?


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More MapReduce Interview Questions

Explain the process of spilling in MapReduce?

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How data is spilt in Hadoop?

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What is the need of MapReduce?

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How to compress mapper output in Hadoop?

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Mention what is the next step after mapper or maptask?

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Explain what does the conf.setMapper Class do in MapReduce?

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What are the data components used by Hadoop?

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With the help of two examples name the map and reduce function purpose

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When is it suggested to use a combiner in a MapReduce job?

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How many Reducers run for a MapReduce job?

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What do you understand by the term Straggler ?

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What do you mean by inputformat?

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