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what is the Hadoop MapReduce APIs contract for a key and value class?
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MapReduce Types and Formats and Setting up a Hadoop Cluster?
What is a MapReduce Combiner?
Explain about the partitioning, shuffle and sort phase in MapReduce?
How to set which framework would be used to run mapreduce program?
What is identity mapper and reducer? In which cases can we use them?
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?
Explain the features of Apache Spark because of which it is superior to Apache MapReduce?
What combiners are and when you should use a combiner in a mapreduce job?
what is JobTracker in Hadoop? What are the actions followed by Hadoop?
What is a Speculative Execution in Hadoop MapReduce?
How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?
Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?
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