Explain what does the conf.setmapper class do?
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What happens when the node running the map task fails before the map output has been sent to the reducer?
Whether the output of mapper or output of partitioner written on local disk?
What counter in Hadoop MapReduce?
What do sorting and shuffling do?
When should you use a reducer?
What is the next step after Mapper or MapTask?
What are the identity mapper and reducer in MapReduce?
What are the advantages of using map side join in mapreduce?
What happens if the quantity of the reducer is 0 in mapreduce?
What are ‘maps’ and ‘reduces’?
What is Mapper in Hadoop MapReduce?
How can you add the arbitrary key-value pairs in your mapper?