What are the primary phases of the reducer?
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What do you understand by a closure in scala?
When and how to create hadoop archive?
How would you check whether your NameNode is working or not?
What is active and passive NameNode in Hadoop?
What is difference between reducer and combiner?
What is NameNode? How NameNode tackle Datanode failures in Hadoop?
Why does one remove or add nodes in a Hadoop cluster frequently?
What do you mean by the NameNode High Availability in hadoop?
What is structured and unstructured data?
What are the features of Fully-Distributed mode?
Explain how can we check whether namenode is working or not?
What happens if one hadoop client renames a file or a directory containing this file while another client is still writing into it?
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