What does a 'MapReduce Partitioner' do?
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Mention what are the main configuration parameters that user need to specify to run mapreduce job?
when do reducers play their role in a mapreduce task?
How to set the number of reducers?
What combiners are and when you should use a combiner in a mapreduce job?
What do you understand by mapreduce?
Explain what is “map” and what is "reducer" in hadoop?
What is the role of a MapReduce partitioner?
What is identity mapper and reducer? In which cases can we use them?
How much space will the split occupy in Mapreduce?
what is JobTracker in Hadoop? What are the actions followed by Hadoop?
how JobTracker schedules a task ?
Describe what happens to a mapreduce job from submission to output?
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