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Explain what combiners are and when you should use a combiner in a mapreduce job?
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What are the various configuration parameters required to run a mapreduce job?
How to set the number of reducers?
Explain Working of MapReduce?
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When is it not recommended to use MapReduce paradigm for large scale data processing?
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Mention what is the hadoop mapreduce apis contract for a key and value class?
how Hadoop is different from other data processing tools?
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Explain the differences between a combiner and reducer
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