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What are the various InputFormats in Hadoop?
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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?
Differentiate Reducer and Combiner in Hadoop MapReduce?
Explain the process of spilling in Hadoop MapReduce?
What happen if the number of the reducer is 0 in MapReduce?
Why Mapper runs in heavy weight process and not in a thread in MapReduce?
How hadoop mapreduce works?
How to create custom key and custom value in MapReduce Job?
Clarify what is shuffling in map reduce?
In mapreduce what is a scarce system resource? Explain?
How to set which framework would be used to run mapreduce program?
What is a distributed cache in mapreduce framework?
What is the Reducer used for?
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