What is HDFS ? How it is different from traditional file systems?
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What is output format in hadoop?
What is the difference between HDFS and NAS ?
What is the difference between Hadoop and Traditional RDBMS?
Command to format the NameNode?
What is a 'block' in HDFS?
How can we check whether namenode is working or not?
Can we do online transactions(oltp) using hadoop?
How the Client communicates with HDFS?
Can the balancer be run while Hadoop is in use?
What is a spill factor with respect to the ram?
What is oozie in hadoop?
Explain the features of fully distributed mode?