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How do ‘map’ and ‘reduce’ work?
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Which Sorting algorithm is used in Hadoop MapReduce?
What is the input type/format in MapReduce by default?
What are the advantages of using mapreduce with hadoop?
What is identity mapper and reducer? In which cases can we use them?
What is partitioner and its usage?
In mapreduce what is a scarce system resource? Explain?
How many Reducers run for a MapReduce job in Hadoop?
How do you stop a running job gracefully?
Explain the differences between a combiner and reducer
Why Mapper runs in heavy weight process and not in a thread in MapReduce?
Why is output file name in Hadoop MapReduce part-r-00000?
What is the function of mapreducer partitioner?
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