Explain what is “map” and what is "reducer" in hadoop?
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When is it not recommended to use MapReduce paradigm for large
Clarify what is shuffling in map reduce?
Why is Apache Spark faster than Hadoop MapReduce?
What is identity mapper and identity reducer?
What are the primary phases of a Reducer?
how indexing in HDFS is done?
what are the most common input formats defined in Hadoop?
Explain what does the conf.setmapper class do?
Explain combiners.
How to overwrite an existing output file during execution of mapreduce jobs?
What is a map side join?
What happens when a datanode fails ?
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