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How to create a custom key and custom value in MapReduce Job?
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What do you mean by shuffling and sorting in MapReduce?
Explain about the partitioning, shuffle and sort phase in MapReduce?
Explain the Reducer's Sort phase?
What is shuffling in mapreduce?
What is a partitioner and how the user can control which key will go to which reducer?
In mapreduce what is a scarce system resource? Explain?
How to sort intermediate output based on values in MapReduce?
How to write MapReduce Programs?
What is the function of mapreduce partitioner?
Is there any point of learning mapreduce, then?
Map reduce jobs take too long. What can be done to improve the performance of the cluster?
What happens when a datanode fails ?
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