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What combiners are and when you should utilize a combiner in a map reduce job?


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More MapReduce Interview Questions

What is MapReduce in Hadoop?

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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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Explain about the partitioning, shuffle and sort phase

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What do you understand by mapreduce?

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What Are Good Use Cases For Impala As Opposed To Hive Or MapReduce?

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Explain InputSplit in Hadoop MapReduce?

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How to create custom key and custom value in MapReduce Job?

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What is the difference between map and reduce?

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What happens if the quantity of the reducer is 0 in mapreduce?

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What is shuffling and sorting in Hadoop MapReduce?

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

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How to set mappers and reducers for Hadoop jobs?

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