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Can there be no Reducer?
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Define the purpose of the partition function in mapreduce framework
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?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
How to set mappers and reducers for MapReduce jobs?
What is shuffleing in mapreduce?
What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?
What do you mean by data locality?
How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?
When is the reducers are started in a MapReduce job?
Clarify what is shuffling in map reduce?
Explain the difference between a MapReduce InputSplit and HDFS block?
What is a TaskInstance?
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