What is the role of the namenode?
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Which database is used in hadoop?
What is JobTracker?
Which one is default?
What do you mean by the NameNode High Availability in hadoop?
How can one write custom record reader?
Mention what does the text input format do?
Ideally what should be the block size in hadoop?
What are some typical functions of job tracker in hadoop?
What is the difference between an inputsplit and a block?
What is Distributed Cache in Hadoop?
Why do we need hadoop for big data analytics?
Where are hadoop’s configuration files located and list them?
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