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Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?


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More MapReduce Interview Questions

What are advantages of Spark over MapReduce?

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What is the inputsplit in map reduce software?

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In MapReduce, ideally how many mappers should be configured on a slave?

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What is the need of MapReduce in Hadoop?

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What is partitioner and its usage?

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If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?

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What is mapper in map reduce?

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List the network requirements for using Hadoop ?

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Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?

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What is the need of key-value pair to process the data in MapReduce?

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Compare Pig vs Hive vs Hadoop MapReduce?

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

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