Explain why do we need hadoop?
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What do masters consist of?
What is the difference between traditional RDBMS and Hadoop?
What is commodity hardware?
Are Namenode and job tracker on the same host?
shouldn't DFS be able to handle large volumes of data already?
What are the modules that constitute the Apache Hadoop 2.0 framework?
What are the modes in which Apache Hadoop run?
How Mapper is instantiated in a running job?
Where do you specify the Mapper Implementation?
What is a Secondary Namenode? Is it a substitute to the Namenode?
What is the default block size in hdfs?
Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?
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