Explain use cases where SequenceFile class can be a good fit?
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What is a checkpoint?
Is it possible to provide multiple inputs to hadoop? If yes, explain.
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 would you modify that solution to only count the number of unique words in all the documents?
What is Disk Balancer in Apache Hadoop?
Define a metadata?
What are combiners and its purpose?
How is the distance between two nodes defined in Hadoop?
Explain what if rack 2 and datanode fails?
What do you mean by taskinstance?
did you maintain the hadoop cluster in-house or used hadoop in the cloud?
What is 'Key value pair' in HDFS?
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