Explain how mapreduce works.
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How to create custom key and custom value in MapReduce Job?
What is OutputCommitter?
Why is output file name in Hadoop MapReduce part-r-00000?
What is the Reducer used for?
MapReduce Types and Formats and Setting up a Hadoop Cluster?
Differentiate Reducer and Combiner in Hadoop MapReduce?
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What is SequenceFileInputFormat?
What is shuffling and sorting in Hadoop MapReduce?
What is the next step after Mapper or MapTask?
How to set the number of reducers?
What is the fundamental difference between a MapReduce InputSplit and HDFS block?
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