What is a namenode?
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Explain Data Locality in Hadoop?
How often DataNode send heartbeat to NameNode in Hadoop?
What does secondary name-node means?
What is the purpose of context object?
What do you understand by standalone (or local) mode?
What is job tracker role in hadoop?
How job tracker schedules an assignment?
If DataNode increases, then do we need to upgrade NameNode in Hadoop?
Is nosql follow relational db model?
Name the files which are used by the startup and shutdown commands?
What is Mapper? How can we compress Mapper output in Hadoop?
How often do you need to reformat the namenode?
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