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What do sorting and shuffling do?
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Explain what combiners are and when you should use a combiner in a mapreduce job?
Explain job scheduling through JobTracker
what daemons run on a master node and slave nodes?
When the reducers are are started in a mapreduce job?
Is reduce-only job possible in Hadoop MapReduce?
What is LazyOutputFormat in MapReduce?
What is Distributed Cache in the MapReduce Framework?
What is the next step after Mapper or MapTask?
For a job in Hadoop, is it possible to change the number of mappers to be created?
What is the fundamental difference between a MapReduce Split and a HDFS block?scale data processing?
What happens when a datanode fails ?
What are the various configuration parameters required to run a mapreduce job?
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