Why can aggregation not be done in Mapper in MapReduce?


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More MapReduce Interview Questions

Why Mapreduce output written in local disk?

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What is reduce side join in mapreduce?

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How is mapreduce related to cloud computing?

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What is sqoop in Hadoop ?

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

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MapReduce Types and Formats and Setting up a Hadoop Cluster?

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What is the purpose of textinputformat?

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What is SequenceFileInputFormat in Hadoop MapReduce?

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

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What are the disservices of utilizing Apache Spark over Hadoop MapReduce?

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what is WebDAV in Hadoop?

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

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