How can we check whether namenode is working or not?
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What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?
What does ‘jps’ command do?
What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?
What is formatting of the dfs?
What is rack-aware replica placement policy?
What is your favourite tool in the hadoop ecosystem?
what is SPF?
Explain the difference between NameNode
Define streaming?
How can one increase replication factor to a desired value in Hadoop?
On what basis Namenode will decide which datanode to write on?
What is yarn in hadoop?
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