How Big is ‘Big Data’?
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What is Mapper? How can we compress Mapper output in Hadoop?
Name the most common Input Formats defined in Hadoop? Which one is default?
Explain the core methods of the reducer?
Why aggregation cannot be done in Mapper?
How does speculative execution work in Hadoop?
What is a Heartbeat in Hadoop?
What is Small File Problem in Hadoop? How can it be resolved?
What is rack awareness in hadoop?
what if job tracker machine is down?
How NameNode tackle Datanode failures in Hadoop?
What are the different modes in which we can configure/install Hadoop?
Explain what happens in text format?
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