Explain combiners.
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What is the best way to copy files between HDFS clusters?
what is storage and compute nodes?
Define MapReduce?
What is the difference between HDFS block and input split?
What are the data components used by Hadoop?
Explain how do ‘map’ and ‘reduce’ work?
Explain about the basic parameters of mapper and reducer function
Explain task granularity
What is the use of InputFormat in MapReduce process?
When is it suggested to use a combiner in a MapReduce job?
Why Mapreduce output written in local disk?
what is the Hadoop MapReduce APIs contract for a key and value class?
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