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  1. Categories >> Software >> Big Data >> Hadoop >> MapReduce
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What do sorting and shuffling do?

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More MapReduce Interview Questions

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

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Explain combiners.

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Can there be no Reducer?

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What is MapReduce?

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What is identity mapper and identity reducer?

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When is the reducers are started in a MapReduce job?

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How to optimize MapReduce Job?

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Mention Hadoop core components?

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Where is Mapper output stored?

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

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Illustrate a simple example of the working of MapReduce.

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Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?

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