Explain the basic architecture of Hadoop?
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Can you explain how do ‘map’ and ‘reduce’ work?
Explain what happens in textinformat ?
Explain what is the purpose of RecordReader in Hadoop?
How the HDFS Blocks are replicated?
Which files are used by the startup and shutdown commands?
Does this lead to security issues?
How a task is scheduled by a jobtracker?
What is difference between split and block in hadoop?
Explain what if rack 2 and datanode fails?
What is the difference between traditional RDBMS and Hadoop?
Why are the number of splits equal to the number of maps?
Mention what are the data components used by Hadoop?
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