What is the difference between rdbms and hadoop?
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Explain why do we need hadoop?
How we can take Hadoop out of Safe Mode?
Explain the basic difference between traditional rdbms and hadoop?
What is unstructured data?
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 the heartbeat used for?
How is security achieved in Apache Hadoop?
How to enable recycle bin or trash in hadoop?
What is a JobTracker in Hadoop? How many instances of JobTracker run on a Hadoop Cluster?
What is the purpose of button groups?
What is crontab? Explain with suitable example?
What do you know about sequencefileinputformat?
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