What is an identity mapper and identity reducer?
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What are the primary phases of a Reducer?
What are the data components used by Hadoop?
Explain the process of spilling in MapReduce?
What happens when the node running the map task fails before the map output has been sent to the reducer?
Developing a MapReduce Application?
When should you use a reducer?
What do you mean by inputformat?
Difference between mapreduce and spark
Why MapReduce uses the key-value pair to process the data?
what is NameNode in Hadoop?
What is the relation between MapReduce and Hive?
Mention what is the hadoop mapreduce apis contract for a key and value class?
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