Explain how mapreduce works.
Mention what is the hadoop mapreduce apis contract for a key and value class?
What is heartbeat in hdfs?
what is Speculative Execution?
Explain the process of spilling in Hadoop MapReduce?
Map reduce jobs take too long. What can be done to improve the performance of the cluster?
List the network requirements for using Hadoop ?
mapper or reducer?
what is storage and compute nodes?
In Hadoop what is InputSplit?
What is the role of recordreader in hadoop mapreduce?
Explain job scheduling through JobTracker
In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?