Define a datanode?
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What is configuration of a typical slave node on Hadoop cluster? How many JVMs run on a slave node?
How did you debug your Hadoop code ?
In which location Name Node stores its Metadata and why?
What is InputSplit and RecordReader?
Mention what is the use of Context Object?
What is the default block size in hdfs?
Explain the difference between NameNode
What is a Secondary Namenode? Is it a substitute to the Namenode?
Explain what if rack 2 and datanode fails?
What is the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?
How is security achieved in Apache Hadoop?
What does /etc /init.d do?
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