Have you ever used counters in hadoop?
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Give a brief overview of Hadoop history?
What is Combiner in Hadoop?
What is the difference between a hadoop database and relational database?
Clarify what is sqoop in hadoop?
How to add/delete a Node to the existing cluster?
What are the common types of NOSQL data bases ?
Explain how can you check whether namenode is working beside using the jps command?
What type of data hadoop can handle ?
How can you set an arbitrary number of mappers to be created for a job in Hadoop?
Name the most common input formats defined in hadoop?
Explain how can we check whether namenode is working or not?
What type of data we should put in distributed cache? When to put the data in dc? How much volume we should put in?
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