Explain about Hadoop file system and processing framework?
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How is the splitting of file invoked in Hadoop ?
Explain the common input formats in hadoop?
Explain how does hadoop classpath plays a vital role in stopping or starting in hadoop daemons?
What happens if the number of reducers is 0 in Hadoop?
Why aggregation cannot be done in Mapper?
What is difference between reducer and combiner?
What is a combiner in hadoop?
Which modes can Hadoop be run in? List a few features for each mode?
What is High Availability feature in Hadoop2?
Can you define udf?
How can one check whether NameNode is working or not?
Why do the nodes are removed and added frequently in a hadoop cluster?
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