What do shuffling do?
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What is a Secondary Namenode? Is it a substitute to the Namenode?
What is Schema on Read and Schema on Write?
What is zookeeper in hadoop?
What is the jobtracker?
what should be the ideal replication factor in hadoop?
How is security achieved in Apache Hadoop?
What is the functionality of jobtracker in hadoop?
What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?
Define a metadata?
Define streaming?
How we can change Replication factor when Data is on the fly?
Explain the hadoop-core configuration?