What is identity mapper and identity reducer?
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Explain combiners.
What is an input reader in reference to mapreduce?
When should you use a reducer?
What is the Job interface in MapReduce framework?
What counter in Hadoop MapReduce?
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
What is Hadoop Map Reduce ?
What is the function of mapreduce partitioner?
In MapReduce, ideally how many mappers should be configured on a slave?
What is a partitioner and how the user can control which key will go to which reducer?
Explain the process of spilling in Hadoop MapReduce?
what does the conf.setMapper Class do ?
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