What stored in HDFS?
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What are sink processors?
Explain the Job OutputFormat?
What is 'Key value pair' in HDFS?
How client application interacts with the NameNode?
what are Task Tracker and Job Tracker?
How to configure hadoop to reuse JVM for mappers?
Explain the difference between gen1 and gen2 hadoop with regards to the namenode?
What are combiners and its purpose?
how can we change Replication Factor?
What is the relation between job and task in hadoop?
What is IdentityMapper?
Did you ever built a production process in hadoop ? If yes then what was the process when your hadoop job fails due to any reason?
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