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What is yarn in hadoop?
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What are the characteristics of hadoop framework?
What is HDFS High Availability?
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?
Define a job tracker?
What Mapper does?
Where is the Mapper Output stored?
What do slaves consist of?
Can you explain how do ‘map’ and ‘reduce’ work?
How can we look for the namenode in the browser?
How many instances of tasktracker run on a hadoop cluster?
What happens to a namenode, when job tracker is down?
Data Engineer Given a list of followers in the format:123, 345234, 678345, 123…Where column one is the ID of the follower and column two is the ID of the followee. Find all mutual following pairs (the pair 123, 345 in the example above). How would you use Map/Reduce to solve the problem when the list does not fit in memory?
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