Explain why do we need hadoop?
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What happens to a namenode, when job tracker is down?
Explain what is sqoop in Hadoop ?
What is the use of combiners in the hadoop framework?
What do you mean by taskinstance?
What is crontab? Explain with suitable example?
What are the modules that constitute the Apache Hadoop 2.0 framework?
What do the master class and the output class do?
What is the communication channel between client and namenode/datanode?
What is the default replication factor?
How to exit the vi editor?
Mention what is the use of Context Object?
What are the two main components of ResourceManager?
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