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?
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Which one will you decide for an undertaking – Hadoop MapReduce or Apache Spark?
Explain how mapreduce works.
How do reducers communicate with each other?
what job does the conf class do?
What happens if the quantity of the reducer is 0 in mapreduce?
What does conf.setmapper class do?
Explain combiners.
A number of combiners can be changed or not in MapReduce?
what daemons run on a master node and slave nodes?
How do Hadoop MapReduce works?
Why Hadoop MapReduce?
What can be optimum value for Reducer?
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