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What is a record reader?
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After increasing the replication level, I still see that data is under replicated. What could be wrong?
How can you set an arbitrary number of mappers to be created for a job in Hadoop?
Explain what is jobtracker in hadoop? What are the actions followed by hadoop?
What is the command to change the replication factor ?
Tell me some major benefits of Hadoop?
What are the different commands used to startup and shutdown Hadoop daemons?
What is the best practice to deploy the secondary name node?
Can you explain bloommapfile.
Which one is default?
Why does one remove or add nodes in a Hadoop cluster frequently?
What are input format, input split & record reader and what they do?
What is active and passive NameNode in Hadoop?
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