What happens when the node running the map task fails before the map output has been sent to the reducer?
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what are the most common input formats defined in Hadoop?
How to write MapReduce Programs?
What is the need of key-value pair to process the data in MapReduce?
Mention when to use Map reduce mode?
Can there be no Reducer?
How to set the number of mappers to be created in MapReduce?
What main configuration parameters are specified in mapreduce?
What is the difference between Reducer and Combiner in Hadoop MapReduce?
Explain what combiners are and when you should use a combiner in a mapreduce job?
What is the Job interface in MapReduce framework?
What is the key- value pair in MapReduce?
What do you mean by data locality?