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What is a combiner and where you should use it?
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Why Mapper runs in heavy weight process and not in a thread in MapReduce?
What is the need of key-value pair to process the data in MapReduce?
What is the difference between map and reduce?
What is the key- value pair in MapReduce?
Name job control options specified by mapreduce.
How to set the number of mappers to be created in MapReduce?
Is it possible to split 100 lines of input as a single split in MapReduce?
Is it mandatory to set input and output type/format in MapReduce?
Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?
What is MapReduce? What are the syntax you use to run a MapReduce program?
How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?
How does fault tolerance work in mapreduce?
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