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What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?
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Mention Hadoop core components?
What happens when the node running the map task fails before the map output has been sent to the reducer?
Explain about the partitioning, shuffle and sort phase in MapReduce?
What is the need of key-value pair to process the data in MapReduce?
What is the use of InputFormat in MapReduce process?
What is a map side join?
Difference between mapreduce and spark
What is a partitioner and how the user can control which key will go to which reducer?
Define the Use of MapReduce?
Why MapReduce uses the key-value pair to process the data?
What is a TaskInstance?
Mention what is the next step after mapper or maptask?
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