What is the Reducer used for?


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More MapReduce Interview Questions

what does the conf.setMapper Class do ?

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Why Hadoop MapReduce?

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Is it mandatory to set input and output type/format in MapReduce?

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What are the main configuration parameters in a MapReduce program?

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MapReduce Types and Formats and Setting up a Hadoop Cluster?

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

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How data is spilt in Hadoop?

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Define speculative execution?

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What are the various configuration parameters required to run a mapreduce job?

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How is mapreduce related to cloud computing?

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What are the main components of MapReduce Job?

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What main configuration parameters are specified in mapreduce?

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