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What is a IdentityMapper and IdentityReducer in MapReduce ?
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Where sorting is done in Hadoop MapReduce Job?
How to set mappers and reducers for MapReduce jobs?
How can you add the arbitrary key-value pairs in your mapper?
What combiners are and when you should utilize a combiner in a map reduce job?
When is the reducers are started in a MapReduce job?
what does the text input format do?
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