What is NoSQL?
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What is a speculative execution in Apache Hadoop MapReduce?
What is a namenode? How many instances of namenode run on a hadoop cluster?
What is IdentityMapper?
Explain the hadoop configuration files at present?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
What are the basic available commands in Hadoop sqoop ?
What is version-id mismatch error in hadoop?
Define a job tracker?
when hadoop enter in safe mode?
Is it necessary to know java to learn hadoop?
How did you debug your Hadoop code ?
What happens to a namenode, when job tracker is down?
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