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What is the data storage component used by Hadoop?
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What is InputFormat in Hadoop MapReduce?
What is a "map" in Hadoop?
Clarify what is shuffling in map reduce?
How to get the single file as the output from MapReduce Job?
What is a partitioner and how the user can control which key will go to which reducer?
What are combiners? When should I use a combiner in my MapReduce Job?
Explain how do ‘map’ and ‘reduce’ work?
A number of combiners can be changed or not in MapReduce?
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?
When should you use sequencefileinputformat?
Explain the Reducer's Sort phase?
What combiners are and when you should use a combiner in a mapreduce job?
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