What is a secondary namenode?
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What does ‘jps’ command do?
What are the stable versions of Hadoop?
Is secondary namenode a substitute to the namenode?
What hadoop does in safe mode?
What is a namenode? How many instances of namenode run on a hadoop cluster?
What is configuration of a typical slave node on Hadoop cluster? How many JVMs run on a slave node?
Which files are used by the startup and shutdown commands?
What is Derby database?
How to Administering Hadoop?
Which are the two types of 'writes' in HDFS?
Is map like a pointer?
Explain how do ‘map’ and ‘reduce’ works?