What is Chain Mapper?
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What do you mean by the NameNode High Availability in hadoop?
Mention what is data cleansing?
Why use hadoop?
What is NameNode? How NameNode tackle Datanode failures in Hadoop?
What does the mapred.job.tracker command do?
What are the port numbers of task tracker?
Is it possible to have hadoop job output in multiple directories? If yes, how?
Mention what is distributed cache in hadoop?
What is Chain Mapper?
What happen if number of reducer is set to 0 in Hadoop?
What happens if you get a ‘connection refused java exception’ when you type hadoop fsck /?
What do you know about the speculative execution?
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