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What is identity mapper and reducer? In which cases can we use them?
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Map reduce jobs take too long. What can be done to improve the performance of the cluster?
Describe what happens to a mapreduce job from submission to output?
What are the advantages of using mapreduce with hadoop?
Compare RDBMS with Hadoop MapReduce.
What is RecordReader in a Map Reduce?
Explain how do ‘map’ and ‘reduce’ work?
Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?
What is identity mapper and reducer? In which cases can we use them?
Is it important for Hadoop MapReduce jobs to be written in Java?
List out Hadoop's three configuration files?
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