Can you explain record reader?
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Have you ever used counters in hadoop?
What are the main components in Hadoop Eco-System and what are their functions ?
What is the command to change the replication factor ?
What are the restriction to the key and value class ?
What is Identity reducer?
Explain what happens when hadoop spawned 50 tasks for a job and one of the task failed?
Can we create a hadoop cluster from scratch?
What sorts of actions does the job tracker process perform?
How often do you need to reformat the namenode?
What happens if one hadoop client renames a file or a directory containing this file while another client is still writing into it?
What are the parameters of mappers and reducers?
What is active and passive NameNode in Hadoop?
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