What hadoop does in safe mode?
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What is the difference between SQL and NoSQL?
how is a file of the size 1 GB uncompressed
On what basis name node distribute blocks across the data nodes?
Define a commodity hardware? Does commodity hardware include ram?
How can we check whether namenode is working or not?
What Mapper does?
What is Distributed Cache?
What is the default replication factor?
Define fault tolerance?
What is the sequencefileinputformat in hadoop?
What is difference between split and block in hadoop?
Explain a simple Map/Reduce problem.