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Explain what does the conf.setmapper class do?
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How many Mappers run for a MapReduce job?
What is MapReduce?
Explain combiners.
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 the input type/format in MapReduce by default?
In MapReduce, ideally how many mappers should be configured on a slave?
What is Reducer in MapReduce?
What MapReduce framework consists of?
Explain what is distributed cache in mapreduce framework?
What is MapReduce? What are the syntax you use to run a MapReduce program?
Why Mapreduce output written in local disk?
What is the need of MapReduce?
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