What will you do when NameNode is down?
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Mention what is the use of Context Object?
In which location Name Node stores its Metadata and why?
What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?
What is Schema on Read and Schema on Write?
What is HDFS block size and what did you chose in your project?
Why is hadoop faster?
How many instances of a jobtracker run on hadoop cluster?
What is Hadoop serialization?
What are the core components of Apache Hadoop?
how can we change Replication Factor?
Command to format the NameNode?
What is output format in hadoop?