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How many numbers of reducers run in Map-Reduce Job?
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What combiners is and when you should use a combiner in a MapReduce Job?
How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.
What are the various configuration parameters required to run a mapreduce job?
what does the conf.setMapper Class do ?
Define the Use of MapReduce?
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What is MapReduce? What are the syntax you use to run a MapReduce program?
Explain how mapreduce works.
What is sqoop in Hadoop ?
Explain what is the function of mapreduce partitioner?
What is the core of the job in MapReduce framework?
How can we assure that the values regarding a particular key goes to the same reducer?
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