What is the Reducer used for?
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what does the conf.setMapper Class do ?
Why Hadoop MapReduce?
Is it mandatory to set input and output type/format in MapReduce?
What are the main configuration parameters in a MapReduce program?
MapReduce Types and Formats and Setting up a Hadoop Cluster?
How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?
How data is spilt in Hadoop?
Define speculative execution?
What are the various configuration parameters required to run a mapreduce job?
How is mapreduce related to cloud computing?
What are the main components of MapReduce Job?
What main configuration parameters are specified in mapreduce?