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When is the reducers are started in a MapReduce job?
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Explain what is the function of mapreduce partitioner?
Clarify what is shuffling in map reduce?
What are the various configuration parameters required to run a mapreduce job?
If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?
Explain what combiners are and when you should use a combiner in a mapreduce job?
what is Speculative Execution?
What are the main configuration parameters in a MapReduce program?
Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?
How to set which framework would be used to run mapreduce program?
Explain the input type/format in mapreduce by default?
What is a combiner and where you should use it?
What is identity mapper and reducer? In which cases can we use them?
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