What is identity mapper and chain mapper?
Mention what is the hadoop mapreduce apis contract for a key and value class?
What is the need of MapReduce in Hadoop?
What are the steps involved in MapReduce framework?
What combiners is and when you should use a combiner in a MapReduce Job?
what is Speculative Execution?
What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?
In MapReduce how to change the name of the output file from part-r-00000?
What is the function of mapreducer partitioner?
What happens if the quantity of the reducer is 0 in mapreduce?
Explain about the partitioning, shuffle and sort phase
What is MapReduce? What are the syntax you use to run a MapReduce program?
What is heartbeat in hdfs?
Can there be no Reducer?
What happens when the node running the map task fails before the map output has been sent to the reducer?