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What is the difference between Job and Task in MapReduce?
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What happen if the number of the reducer is 0 in MapReduce?
Is it mandatory to set input and output type/format in MapReduce?
Whether the output of mapper or output of partitioner written on local disk?
Explain how do ‘map’ and ‘reduce’ work?
What is Reduce only jobs?
Clarify what combiners are and when you should utilize a combiner in a map reduce job?
In Hadoop, which file controls reporting in Hadoop?
List the configuration parameters that have to be specified when running a MapReduce job.
What is identity mapper and chain mapper?
Why Mapper runs in heavy weight process and not in a thread in MapReduce?
Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?
Where sorting is done on mapper node or reducer node in MapReduce?
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