How to optimize MapReduce Job?
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How does inputsplit in mapreduce determines the record boundaries correctly?
when do reducers play their role in a mapreduce task?
What is the InputSplit in map reduce ?
What happen if the number of the reducer is 0 in MapReduce?
what is Speculative Execution?
What are the the issues associated with the map and reduce slots based mechanism in mapReduce?
What is difference between an input split and hdfs block?
What is heartbeat in hdfs? Explain.
What happens when the node running the map task fails before the map output has been sent to the reducer?
What is a IdentityMapper and IdentityReducer in MapReduce ?
How to create custom key and custom value in MapReduce Job?
What is Counter in MapReduce?
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