Explain what if rack 2 and datanode fails?
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How to change replication factor of files already stored in HDFS?
If a data Node is full how it's identified?
what is difference between int and intwritable?
Define a task tracker?
Have you ever used Counters in Hadoop. Give us an example scenario?
What is a namenode? How many instances of namenode run on a hadoop cluster?
What are the functions of NameNode?
How does a namenode handle the failure of the data nodes?
Explain the difference between NameNode
What is oozie in hadoop?
What are the network requirements for using hadoop?
What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?
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