What is a NameNode? How many instances of NameNode run on a Hadoop Cluster?
Is it possible to provide multiple input to Hadoop? If yes then how can you give multiple directories as input to the Hadoop job
How would you tackle counting words in several text documents?
How will you write a custom partitioner for a Hadoop job?
How can you add the arbitrary key-value pairs in your mapper?
What are combiners? When should I use a combiner in my MapReduce Job?
Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?
What happens if you don?t override the Mapper methods and keep them as it is?
How does an Hadoop application look like or their basic components?
What are the restriction to the key and value class ?
Explain the WordCount implementation via Hadoop framework ?
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