What is the role of recordreader in hadoop mapreduce?
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How to set the number of mappers to be created in MapReduce?
Explain the input type/format in mapreduce by default?
Difference between mapreduce and spark
Explain JobConf in MapReduce.
What is the data storage component used by Hadoop?
How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?
Is it necessary to write a mapreduce job in java?
In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?
Is it possible to search for files using wildcards?
What is a Distributed Cache in Hadoop?
What is partitioner and its usage?
What is a map side join?