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Explain the difference between a MapReduce InputSplit and HDFS block?


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More MapReduce Interview Questions

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

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

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

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What are mapreduce new and old apis while writing map reduce program?. Explain how it works

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How to optimize MapReduce Job?

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Is it possible to rename the output file?

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

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Why can aggregation not be done in Mapper in MapReduce?

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what does the conf.setMapper Class do ?

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How to optimize Hadoop MapReduce Job?

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

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