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What is an identity mapper and identity reducer?
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Why Mapreduce output written in local disk?
Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?
what are the main configuration parameters that user need to specify to run Mapreduce Job ?
Mention what is the hadoop mapreduce apis contract for a key and value class?
Why is Apache Spark faster than Hadoop MapReduce?
What is shuffling and sorting in Hadoop MapReduce?
Define MapReduce?
What main configuration parameters are specified in mapreduce?
Explain the features of Apache Spark because of which it is superior to Apache MapReduce?
What is difference between a MapReduce InputSplit and HDFS block
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.
For a job in Hadoop, is it possible to change the number of mappers to be created?
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