Rack awareness of Namenode?
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Why the name ‘hadoop’?
Is it necessary to know java to learn hadoop?
Explain the Job OutputFormat?
What are the most commonly defined input formats in Hadoop?
Is hadoop obsolete?
Which data storage components are used by hadoop?
Why do we use Hadoop?
What is a namenode? How many instances of namenode run on a hadoop cluster?
Explain a simple Map/Reduce problem.
How can we check whether namenode is working or not?
Can Hadoop be compared to NOSQL database like Cassandra?
Is hadoop based on google mapreduce?
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