Define a datanode?
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What happens to job tracker when namenode is down?
Explain the wordcount implementation via hadoop framework ?
How do you categorize a big data?
Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?
What is the main purpose of HDFS fsck command?
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?
Is hadoop obsolete?
Does hadoop always require digital data to process?
What is the functionality of jobtracker in hadoop?
On which port does ssh work?
Why do we need a password-less ssh in fully distributed environment?
What are the hadoop's three configuration files?
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