What is a Secondary Namenode? Is it a substitute to the Namenode?
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Define fault tolerance?
Can you explain how do ‘map’ and ‘reduce’ work?
Explain the wordcount implementation via hadoop framework ?
What does /etc /init.d do?
How the Client communicates with HDFS?
What is output format in hadoop?
What is Distributed Cache?
What is the functionality of jobtracker in hadoop?
What is a 'block' in HDFS?
What is Input Split in hadoop?
How to write a Custom Key Class?
How did you debug your Hadoop code ?
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