What is the jobtracker and what it performs in a hadoop cluster?
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what are the nodes in the Hadoop cluster?
What is Row Key?
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Explain Erasure Coding in Apache Hadoop?
What exactly is hadoop?
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 are the functionalities of jobtracker?
What hadoop does in safe mode?
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