What are the port numbers of namenode?
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Define a udf?
What is CAP Theorem? What aspects does Hadoop support from this theorem?
What do you mean by the NameNode High Availability in hadoop?
What happen on the namenode when a client tries to read a data file?
How to do ‘map’ and ‘reduce’ works?
What is the relationship between Jobs and Tasks in Hadoop?
What is the basic difference between traditional RDBMS and Hadoop?
What does secondary name-node means?
What do you understand by unit and ()in scala?
What does hadoop-env.sh do?
Explain how does hadoop classpath plays a vital role in stopping or starting in hadoop daemons?
what is next step after mapper or maptask?
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