Explain about the partitioning, shuffle and sort phase in MapReduce?
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How to write a custom partitioner for a Hadoop MapReduce job?
When should you use sequencefileinputformat?
What are the advantages of using map side join in mapreduce?
Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.
Explain what is shuffling in mapreduce?
Explain what are the basic parameters of a mapper?
How to configure the number of the Combiner in MapReduce?
What is the data storage component used by Hadoop?
MapReduce Types and Formats and Setting up a Hadoop Cluster?
How can we control particular key should go in a specific reducer?
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 are combiners? When should I use a combiner in my MapReduce Job?
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