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What is a RecordReader in Hadoop MapReduce?
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Explain about the partitioning, shuffle and sort phase
What is a partitioner and how the user can control which key will go to which reducer?
What is Combiner in MapReduce?
what daemons run on a master node and slave nodes?
When should you use a reducer?
How can we assure that the values regarding a particular key goes to the same reducer?
It can be possible that a Job has 0 reducers?
What is a scarce system resource?
Where sorting is done on mapper node or reducer node in MapReduce?
Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.
What is reduce side join in mapreduce?
Describe what happens to a mapreduce job from submission to output?
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