Can you explain combiner?
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Mention what are the most common input formats defined in hadoop?
What is configured in /etc/hosts and what is its role in setting Hadoop cluster?
Explain how can you debug hadoop code?
Clarify what a task tracker is in hadoop?
What is single node cluster in Hadoop? for what all purposes Hadoop run on a single node cluster?
How to do ‘map’ and ‘reduce’ works?
What is the basic difference between traditional RDBMS and Hadoop?
What is the relationship between Jobs and Tasks in Hadoop?
Can you explain commodity hardware?
Compare Hadoop 2 and Hadoop 3?
What happens if you don?t override the mapper methods and keep them as it is?
How often DataNode send heartbeat to NameNode in Hadoop?
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