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How many Mappers run for a MapReduce job?
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How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.
What is an input reader in reference to mapreduce?
What are the disservices of utilizing Apache Spark over Hadoop MapReduce?
What is an identity mapper and identity reducer?
What are ‘maps’ and ‘reduces’?
What combiners is and when you should use a combiner in a MapReduce Job?
What are the various input and output types supported by mapreduce?
Can MapReduce program be written in any language other than Java?
What is the key- value pair in MapReduce?
Explain about the partitioning, shuffle and sort phase
What is shuffling in mapreduce?
What is shuffling and sorting in Hadoop MapReduce?
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