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What is Reducer in MapReduce?
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Where sorting is done on mapper node or reducer node in MapReduce?
What is the difference between an RDBMS and Hadoop?
What is the default input type in MapReduce?
what is JobTracker in Hadoop? What are the actions followed by Hadoop?
Describe what happens to a mapreduce job from submission to output?
What is SequenceFileInputFormat?
When is the reducers are started in a MapReduce job?
What is the best way to copy files between HDFS clusters?
What are the advantages of using map side join in mapreduce?
Is there any point of learning mapreduce, then?
what is the Hadoop MapReduce APIs contract for a key and value class?
What is a combiner and where you should use it?
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