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Define a daemon?
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Did you ever built a production process in hadoop ? If yes then what was the process when your hadoop job fails due to any reason?
What is inputformat in hadoop?
did you maintain the hadoop cluster in-house or used hadoop in the cloud?
What are the stable versions of Hadoop?
How does NameNode tackle DataNode failures?
What is a namenode? How many instances of namenode run on a hadoop cluster?
What hadoop does in safe mode?
How will you make changes to the default configuration files?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
Why password is needed in ssh localhost?
What do shuffling do?
How many instances of a jobtracker run on hadoop cluster?
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