Explain how jobtracker schedules a task?
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How many datanodes can run on a single Hadoop cluster?
What is the role of the secondary namenode?
What happens when two clients try to access the same file in the hdfs?
Can I set the number of reducers to zero?
Compare Hadoop 2 and Hadoop 3?
Explain how can you debug hadoop code?
What is Rack Awareness? What is its need in Hadoop?
What is job tracker in Hadoop?
Where are hadoop’s configuration files located and list them?
What happens if you get a ‘connection refused java exception’ when you type hadoop fsck /?
What are the different commands used to startup and shutdown Hadoop daemons?
What is a record reader?
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