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What is the need of key-value pair to process the data in MapReduce?


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More MapReduce Interview Questions

What is the default value of map and reduce max attempts?

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Why can aggregation not be done in Mapper in MapReduce?

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Where is Mapper output stored?

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Why is output file name in Hadoop MapReduce part-r-00000?

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What is the utility of using Writable Comparable Custom Class in Map Reduce code?

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Explain the features of Apache Spark because of which it is superior to Apache MapReduce?

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Explain what is shuffling in mapreduce?

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what job does the conf class do?

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How to submit extra files(jars, static files) for MapReduce job during runtime?

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How can we assure that the values regarding a particular key goes to the same reducer?

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Mention when to use Map reduce mode?

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What are mapreduce new and old apis while writing map reduce program?. Explain how it works

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