If datanodes increase, then do we need to upgrade namenode?
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Explain the core methods of the reducer?
Mention what is the difference between an rdbms and hadoop?
Clarify how job tracker schedules an assignment?
How is the splitting of file invoked in Hadoop framework?
What happens if you don?t override the mapper methods and keep them as it is?
What is distributed copy (distcp)?
How to use combiner in hadoop ?
If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?
What jobtracker is in hadoop? What are the activities followed by hadoop?
How does hadoop achieve fault tolerance?
What is TextInputFormat in Hadoop?
What is the best practice to deploy the secondary name node?
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