what is NameNode in Hadoop?
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Where is Mapper output stored?
What is the use of InputFormat in MapReduce process?
Explain what is the function of mapreduce partitioner?
What is RecordReader in a Map Reduce?
Explain what is “map” and what is "reducer" in hadoop?
What are ‘reduces’?
What is the utility of using Writable Comparable Custom Class in Map Reduce code?
What is identity mapper and identity reducer?
Clarify what combiners are and when you should utilize a combiner in a map reduce job?
For a Hadoop job, how will you write a custom partitioner?
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
What is a partitioner and how the user can control which key will go to which reducer?