Clarify what is shuffling in map reduce?
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What is the role of a MapReduce partitioner?
List the configuration parameters that have to be specified when running a MapReduce job.
Explain the differences between a combiner and reducer
What are the identity mapper and reducer in MapReduce?
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
What is shuffleing in mapreduce?
What is Counter in MapReduce?
What Are Good Use Cases For Impala As Opposed To Hive Or MapReduce?
What are the various configuration parameters required to run a mapreduce job?
What is RecordReader in a Map Reduce?
Map reduce jobs take too long. What can be done to improve the performance of the cluster?
How do ‘map’ and ‘reduce’ work?
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