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What are the hadoop configuration files at present?
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What happens if you don?t override the mapper methods and keep them as it is?
Can you define udf?
What is NameNode? How NameNode tackle Datanode failures in Hadoop?
What does the file hadoop-metrics.properties do?
Mention what daemons run on a master node and slave nodes?
Mention what is rack awareness?
Explain is it possible to search for files using wildcards?
what happens when namenode goes down during file read operation in hadoop?
what is next step after mapper or maptask?
What is the purpose of RecordReader in hadoop?
How many daemon processes run on a hadoop cluster?
Name the operating system(s) which are supported for production hadoop deployment?
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