How Mapper is instantiated in a running job?
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In which location Name Node stores its Metadata and why?
What are the most commonly defined input formats in Hadoop?
What other technologies have you used in hadoop sta ck?
Whats is distributed cache in hadoop?
How would you use Map/Reduce to split a very large graph into smaller pieces and parallelize the computation of edges according to the fast/dynamic change of data?
did you maintain the hadoop cluster in-house or used hadoop in the cloud?
Explain the wordcount implementation via hadoop framework ?
What is NoSQL?
What do the master class and the output class do?
What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?
What mechanism does hadoop framework provides to synchronize changes made in distribution cache during runtime of the application?
Define a commodity hardware? Does commodity hardware include ram?