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What combiners are and when you should utilize a combiner in a map reduce job?
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How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?
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.
what is the Hadoop MapReduce APIs contract for a key and value class?
Where is Mapper output stored?
What is mapreduce algorithm?
Define MapReduce?
Explain what are the basic parameters of a mapper?
What is the use of InputFormat in MapReduce process?
What is the function of mapreducer partitioner?
Explain the input type/format in mapreduce by default?
Explain what is distributed cache in mapreduce framework?
What are ‘maps’ and ‘reduces’?
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