How Mapper is instantiated in a running job?
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Explain the hadoop configuration files at present?
Explain how do ‘map’ and ‘reduce’ works?
How did you debug your Hadoop code ?
Explain a simple Map/Reduce problem.
Is secondary namenode a substitute to the namenode?
What is Partioner in hadoop? Where does it run
What is inputsplit in hadoop? Explain.
What is difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?
Define a task tracker?
What is the difference between SQL and NoSQL?
What are the default configuration files that are used in hadoop?
What do sorting do?
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