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What is difference between regular file system and HDFS?
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Have you ever used Counters in Hadoop. Give us an example scenario?
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?
What is Derby database?
What is Row Key?
What is difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
What are the hadoop's three configuration files?
What is a block and block scanner in HDFS?
What happens in a textinputformat?
What are the modes in which Apache Hadoop run?
What is the main purpose of HDFS fsck command?
Can we have multiple entries in the master files?
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