What are the four basic parameters of a reducer?
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Can we set the number of reducers to zero in MapReduce?
When is it suggested to use a combiner in a MapReduce job?
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.
mapper or reducer?
what does the text input format do?
What is InputFormat in Hadoop MapReduce?
What happens when the node running the map task fails before the map output has been sent to the reducer?
Detail description of the Reducer phases?
what is the Hadoop MapReduce APIs contract for a key and value class?
Is it possible to rename the output file?
What is the difference between map and reduce?
How can we assure that the values regarding a particular key goes to the same reducer?
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