How the Client communicates with HDFS?
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How client application interacts with the NameNode?
What is IdentityMapper?
What is a Record Reader in hadoop?
How is hadoop different from other data processing tools?
What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?
Explain the master class and the output class do?
What are the important differences between apache and hadoop?
How many instances of tasktracker run on a hadoop cluster?
What is Derby database?
What is the InputFormat ?
Define a metadata?
Explain the use of tasktracker in the hadoop cluster?