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Explain the differences between a combiner and reducer


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More MapReduce Interview Questions

Explain slot in Hadoop Map-Reduce v1?

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How to optimize Hadoop MapReduce Job?

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What do sorting and shuffling do?

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What is a distributed cache in mapreduce framework?

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What are the various input and output types supported by mapreduce?

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How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?

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what happens in textinformat ?

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What do you mean by shuffling and sorting in MapReduce?

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what is the Hadoop MapReduce APIs contract for a key and value class?

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What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?

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How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.

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Where the mapper's intermediate data will be stored?

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