How do you define "block" in HDFS?
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Define a datanode?
How many JVMs run on a slave node?
What is the difference between HDFS and NAS ?
How to resolve IOException: Cannot create directory
What is HDFS Block size? How is it different from traditional file system block size?
What is inputsplit in hadoop? Explain.
What are the two main parts of the hadoop framework?
What is the jobtracker?
Command to format the NameNode?
Explain how do ‘map’ and ‘reduce’ works?
What will you do when NameNode is down?
What are active and passive "NameNodes"?
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