What is a IdentityMapper and IdentityReducer in MapReduce ?
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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?
What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?
What is Reduce only jobs?
What are the advantages of using map side join in mapreduce?
what is a sequence file in Hadoop?
When is it not recommended to use MapReduce paradigm for large scale data processing?
what job does the conf class do?
what is "map" and what is "reducer" in Hadoop?
what daemons run on a master node and slave nodes?
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
Is reduce-only job possible in Hadoop MapReduce?
Where sorting is done in Hadoop MapReduce Job?
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