What is a single point of failure in Hadoop 1 and how is it resolved in Hadoop 2?
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What is Distributed Cache in Hadoop?
Can you explain commodity hardware?
How to debug Hadoop code?
Compare Hadoop and RDBMS?
What do you mean by the NameNode High Availability in hadoop?
How to restart NameNode or all the daemons in Hadoop?
How would you check whether your NameNode is working or not?
Explain what is a task tracker in hadoop?
If datanodes increase, then do we need to upgrade namenode?
Explain how can you debug hadoop code?
When and how to create hadoop archive?
What is a combiner in hadoop?
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