What combiners are and when you should utilize a combiner in a map reduce job?
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What can be optimum value for Reducer?
Explain what you understand by speculative execution
Explain Working of MapReduce?
What are ‘reduces’?
Explain the general mapreduce algorithm
What are the the issues associated with the map and reduce slots based mechanism in mapReduce?
Explain the input type/format in mapreduce by default?
What is identity mapper and identity reducer?
What is Data Locality in Hadoop?
What is SequenceFileInputFormat in Hadoop MapReduce?
What are the four essential parameters of a mapper?
What is the data storage component used by Hadoop?