How to set the number of reducers?
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What are the advantages of using map side join in mapreduce?
What combiners are and when you should use a combiner in a mapreduce job?
What is the function of mapreduce partitioner?
Explain what is “map” and what is "reducer" in hadoop?
What is MapReduce in Hadoop?
What is shuffling in mapreduce?
Explain what does the conf.setmapper class do?
What are the advantages of using mapreduce with hadoop?
Can you tell us how many daemon processes run on a hadoop system?
Define the purpose of the partition function in mapreduce framework
What is KeyValueTextInputFormat in Hadoop MapReduce?
How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.
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