What are the main components of a Hadoop Application?
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How do you categorize a big data?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
What if a namenode has no data?
How you can contact your client everyday ?
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?
How does a namenode handle the failure of the data nodes?
What is a JobTracker in Hadoop? How many instances of JobTracker run on a Hadoop Cluster?
How does master slave architecture in the hadoop?
What is Hadoop Custom partitioner ?
Can you tell us more about ssh?
explain Metadata in Namenode?
What infrastructure do we need to process 100 TB data using Hadoop?