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What are the advantages of using map side join in mapreduce?
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If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?
What is identity mapper and reducer? In which cases can we use them?
Explain combiners.
what is NameNode in Hadoop?
Define the purpose of the partition function in mapreduce framework
How to set mappers and reducers for MapReduce jobs?
How do ‘map’ and ‘reduce’ work?
When should you use a reducer?
How to submit extra files(jars, static files) for Hadoop MapReduce job during runtime?
what daemons run on a master node and slave nodes?
What is the use of InputFormat in MapReduce process?
Illustrate a simple example of the working of MapReduce.
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