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What is Federation?
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Explain how can you check whether namenode is working beside using the jps command?
What are the modes in which Hadoop run?
What is the best practice to deploy the secondary name node?
Explain what is storage and compute nodes?
What are the configuration files in Hadoop?
Why do the nodes are removed and added frequently in a hadoop cluster?
What happens if one hadoop client renames a file or a directory containing this file while another client is still writing into it?
What is the role of the secondary namenode?
What is meant by streaming access?
Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?
Explain what is jobtracker in hadoop? What are the actions followed by hadoop?
What do you understand by a closure in scala?
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