What is the use of context object?
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Define “speculative execution” in hadoop?
Why aggregation cannot be done in Mapper?
What is a udf?
What is the difference between a hadoop database and relational database?
How to debug Hadoop code?
Mention what are the most common input formats defined in hadoop?
Mention what daemons run on a master node and slave nodes?
What is Small File Problem in Hadoop? How can it be resolved?
What are the benefits yarn brings in to hadoop?
What is the block size in Hadoop?
How is the splitting of file invoked in Hadoop ?
What is a namenode?
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