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What are combiners? When should I use a combiner in my MapReduce Job?


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More MapReduce Interview Questions

MapReduce Types and Formats and Setting up a Hadoop Cluster?

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Mention Hadoop core components?

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Is it possible to split 100 lines of input as a single split in MapReduce?

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Compare Pig vs Hive vs Hadoop MapReduce?

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What is the process of changing the split size if there is limited storage space on Commodity Hardware?

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

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What is optimal size of a file for distributed cache?

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When the reducers are are started in a mapreduce job?

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When should you use a reducer?

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Where is the output of Mapper written in Hadoop?

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Difference between mapreduce and spark

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What is an identity mapper and identity reducer?

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