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What are the four basic parameters of a reducer?


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More MapReduce Interview Questions

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

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

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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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mapper or reducer?

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what does the text input format do?

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What is InputFormat in Hadoop MapReduce?

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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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Detail description of the Reducer phases?

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

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Is it possible to rename the output file?

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What is the difference between map and reduce?

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

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