In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?
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Explain JobConf in MapReduce.
what are the most common input formats defined in Hadoop?
When should you use a reducer?
Explain what does the conf.setMapper Class do in MapReduce?
How can we control particular key should go in a specific reducer?
What are the primary phases of a Reducer?
what does the conf.setMapper Class do ?
Mention Hadoop core components?
What combiners are and when you should use a combiner in a mapreduce job?
What is shuffling and sorting in Hadoop MapReduce?
What is identity mapper and reducer? In which cases can we use them?
What is the core of the job in MapReduce framework?
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