How to create a custom key and custom value in MapReduce Job?
what is NameNode in Hadoop?
What is an identity mapper and identity reducer?
What is a Speculative Execution in Hadoop MapReduce?
What are ‘maps’ and ‘reduces’?
How to specify more than one directory as input in the Hadoop MapReduce Program?
Explain combiners.
What happen if the number of the reducer is 0 in MapReduce?
what is storage and compute nodes?
What are the steps involved in MapReduce framework?
Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?
Is it possible to search for files using wildcards?
List the configuration parameters that have to be specified when running a MapReduce job.