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What combiners is and when you should use a combiner in a MapReduce Job?


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More MapReduce Interview Questions

Why can aggregation not be done in Mapper in MapReduce?

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How to set which framework would be used to run mapreduce program?

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What is optimal size of a file for distributed cache?

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

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

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When is it not recommended to use MapReduce paradigm for large scale data processing?

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Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?

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What are the identity mapper and reducer in MapReduce?

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How to get the single file as the output from MapReduce Job?

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What is RecordReader in a Map Reduce?

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What are the data components used by Hadoop?

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What is the difference between map and reduce?

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