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Explain the differences between a combiner and reducer


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More MapReduce Interview Questions

How to set mappers and reducers for MapReduce jobs?

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Which one will you decide for an undertaking – Hadoop MapReduce or Apache Spark?

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What is Hadoop Map Reduce ?

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what happens in textinformat ?

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What is the need of MapReduce in Hadoop?

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How do you stop a running job gracefully?

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Where is Mapper output stored?

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What is a partitioner and how the user can control which key will go to which reducer?

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Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.

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Why Mapreduce output written in local disk?

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What is Mapper in Hadoop MapReduce?

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What are the the issues associated with the map and reduce slots based mechanism in mapReduce?

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