What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?
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Have you ever used Counters in Hadoop. Give us an example scenario?
How many instances of JobTracker can run on a Hadoop Cluser?
What is the use of Combiner?
What is configuration of a typical slave node on Hadoop cluster? How many JVMs run on a slave node?
What do you know about keyvaluetextinputformat?
What do you mean by taskinstance?
What is HDFS Federation?
How to restart Namenode?
What do slaves consist of?
How to change Replication Factor For below cases ?
what is a datanode?
What are the different types of Znodes?
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