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For a job in Hadoop, is it possible to change the number of mappers to be created?
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What is the key- value pair in Hadoop MapReduce?
What are the data components used by Hadoop?
Explain the process of spilling in Hadoop MapReduce?
When is it suggested to use a combiner in a MapReduce job?
When is the reducers are started in 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?
Can we set the number of reducers to zero in MapReduce?
Explain combiners.
What do you mean by shuffling and sorting in MapReduce?
Mention when to use Map reduce mode?
How to get the single file as the output from MapReduce Job?
Explain the Reducer's reduce phase?
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