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When is the reducers are started in a MapReduce job?
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What does a split do?
It can be possible that a Job has 0 reducers?
How many Reducers run for a MapReduce job in Hadoop?
Explain what combiners are and when you should use a combiner in a mapreduce job?
Explain how do ‘map’ and ‘reduce’ work?
What is the need of key-value pair to process the data in MapReduce?
What is the function of mapreducer partitioner?
What is identity mapper and identity reducer?
Developing a MapReduce Application?
Mention what is the hadoop mapreduce apis contract for a key and value class?
When is it not recommended to use MapReduce paradigm for large scale data processing?
Can there be no Reducer?
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