What is a IdentityMapper and IdentityReducer in MapReduce ?
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What is the key- value pair in Hadoop MapReduce?
How is reporting controlled in hadoop?
Explain combiners.
How to set mappers and reducers for MapReduce jobs?
how indexing in HDFS is done?
Why comparison of types is important for MapReduce?
Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?
what is distributed cache in mapreduce framework?
What do you understand by the term Straggler ?
Define speculative execution?
Explain what are the basic parameters of a mapper?
How to write a custom partitioner for a Hadoop MapReduce job?
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