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Explain the Reducer's reduce phase?
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What is the fundamental difference between a MapReduce Split and a HDFS block?scale data processing?
how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?
what is distributed cache in mapreduce framework?
What is the Job interface in MapReduce framework?
Which are the methods in the mapper interface?
What is identity mapper and reducer? In which cases can we use them?
How is Spark not quite the same as MapReduce? Is Spark quicker than MapReduce?
How many Reducers run for a MapReduce job?
What happens when a datanode fails ?
How to get the single file as the output from MapReduce Job?
How to submit extra files(jars, static files) for MapReduce job during runtime?
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?
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