How to create a custom key and custom value in MapReduce Job?
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Explain how do ‘map’ and ‘reduce’ work?
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
What is the purpose of textinputformat?
How to get the single file as the output from MapReduce Job?
Explain what combiners are and when you should use a combiner in a mapreduce job?
Can you tell us how many daemon processes run on a hadoop system?
Clarify what is shuffling in map reduce?
How many Reducers run for a MapReduce job in Hadoop?
Explain job scheduling through JobTracker
Where is the output of Mapper written in Hadoop?
Mention Hadoop core components?
What do you understand by the term Straggler ?
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