Did you ever built a production process in hadoop ? If yes then what was the process when your hadoop job fails due to any reason?
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What problems have you faced when you are working on Hadoop code?
What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?
Explain the wordcount implementation via hadoop framework ?
What is inputformat in hadoop?
What is a Secondary Namenode? Is it a substitute to the Namenode?
How to write a Custom Key Class?
What is DistributedCache and its purpose?
What do you know by storage and compute node?
Which one is default InputFormat in Hadoop ?
Can you explain how do ‘map’ and ‘reduce’ work?
what is the typical block size of an HDFS block?
Explain what is the purpose of RecordReader in Hadoop?
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