What main configuration parameters are specified in mapreduce?
What is a partitioner and how the user can control which key will go to which reducer?
What is the Reducer used for?
What is the difference between Reducer and Combiner in Hadoop MapReduce?
Does Partitioner run in its own JVM or shares with another process?
When should you use a reducer?
Is Mapreduce Required For Impala? Will Impala Continue To Work As Expected If Mapreduce Is Stopped?
What combiners is and when you should use a combiner in a MapReduce Job?
How can we assure that the values regarding a particular key goes to the same reducer?
What is map/reduce job in hadoop?
What are the four essential parameters of a mapper?
Explain what are the basic parameters of a mapper?
Is it possible to search for files using wildcards?