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


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More MapReduce Interview Questions

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

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Name job control options specified by mapreduce.

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What is SequenceFileInputFormat in Hadoop MapReduce?

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How to set the number of mappers for a MapReduce job?

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Where sorting is done on mapper node or reducer node in MapReduce?

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How do you stop a running job gracefully?

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What is the key- value pair in MapReduce?

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what is WebDAV in Hadoop?

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

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How to specify more than one directory as input to the MapReduce Job?

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What are the primary phases of a Reducer?

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How does fault tolerance work in mapreduce?

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