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Explain how do ‘map’ and ‘reduce’ work?


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More MapReduce Interview Questions

what is JobTracker in Hadoop? What are the actions followed by Hadoop?

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What is RecordReader in a Map Reduce?

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How to compress mapper output in Hadoop?

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What is SequenceFileInputFormat?

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what does the conf.setMapper Class do ?

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What happens when the node running the map task fails before the map output has been sent to the reducer?

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Can we set the number of reducers to zero in MapReduce?

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What are the various configuration parameters required to run a mapreduce job?

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What is Mapper in Hadoop MapReduce?

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When should you use a reducer?

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What is a MapReduce Combiner?

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What is Text Input Format?

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