what is NameNode in Hadoop?
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What is the Reducer used for?
What is difference between a MapReduce InputSplit and HDFS block
How does inputsplit in mapreduce determines the record boundaries correctly?
How do ‘map’ and ‘reduce’ work?
What do you mean by data locality?
Detail description of the Reducer phases?
Does Partitioner run in its own JVM or shares with another process?
Explain how do ‘map’ and ‘reduce’ work?
Explain task granularity
what are the main configuration parameters that user need to specify to run Mapreduce Job ?
Explain the Reducer's reduce phase?
What is the role of recordreader in hadoop mapreduce?
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