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Explain what combiners are and when you should use a combiner in a mapreduce job?
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How to change a number of mappers running on a slave in MapReduce?
Mention what is the hadoop mapreduce apis contract for a key and value class?
A number of combiners can be changed or not in MapReduce?
What platform and Java version is required to run Hadoop?
List the configuration parameters that have to be specified when running a MapReduce job.
What is the process of changing the split size if there is limited storage space on Commodity Hardware?
What is the difference between Hadoop and RDBMS?
What happens if the quantity of the reducer is 0 in mapreduce?
What is InputFormat in Hadoop MapReduce?
What are the configuration parameters in the 'MapReduce' program?
When Namenode is down what happens to job tracker?
Explain the input type/format in mapreduce by default?
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