Why can aggregation not be done in Mapper in MapReduce?


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More MapReduce Interview Questions

How do reducers communicate with each other?

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Describe what happens to a mapreduce job from submission to output?

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How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?

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What is the fundamental difference between a MapReduce Split and a HDFS block?scale data processing?

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Why MapReduce uses the key-value pair to process the data?

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Explain what does the conf.setmapper class do?

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Difference between mapreduce and spark

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What is the utility of using Writable Comparable Custom Class in Map Reduce code?

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What is MapReduce?

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What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?

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In MapReduce how to change the name of the output file from part-r-00000?

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What is the difference between a MapReduce InputSplit and HDFS block?

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