Define data cleansing?
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What is heartbeat in hadoop?
what happens when namenode goes down during file read operation in hadoop?
What are input format, input split & record reader and what they do?
What are some typical functions of Job Tracker?
Explain what is jobtracker in hadoop? What are the actions followed by hadoop?
Ideally what should be replication factor in a Hadoop cluster?
Where are hadoop’s configuration files located and list them?
Give examples of some companies that are using Hadoop structure?
What are the features of Fully-Distributed mode?
Explain what is speculative execution?
What are the main components of hadoop?
What does the high availability of a name-node means?
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