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What is the difference between Hadoop and Traditional RDBMS?
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What are different hdfs dfs shell commands to perform copy operation?
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 a JobTracker in Hadoop? How many instances of JobTracker run on a Hadoop Cluster?
What should be the ideal replication factor in Hadoop Cluster?
What is safe mode in Hadoop?
What is a Combiner?
What other technologies have you used in hadoop sta ck?
What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?
How does NameNode tackle DataNode failures?
Can NameNode and DataNode be a commodity hardware?
Explain the use of .mecia class?
What are different types of filesystem?
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