What are the four basic parameters of a reducer?
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What is identity mapper and chain mapper?
Explain what combiners are and when you should use a combiner in a mapreduce job?
What is the best way to copy files between HDFS clusters?
How does fault tolerance work in mapreduce?
What is the difference between HDFS block and input split?
What is OutputCommitter?
How to set the number of reducers?
How is Spark not quite the same as MapReduce? Is Spark quicker than MapReduce?
Explain how do ‘map’ and ‘reduce’ work?
Can we rename the output file?
How to set the number of mappers for a MapReduce job?
What is an input reader in reference to mapreduce?
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