What are the differences between hadoop 1 and hadoop 2?
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Mention what is data cleansing?
What do you know about the speculative execution?
What sorts of actions does the job tracker process perform?
What are input format, input split & record reader and what they do?
What is NameNode? How NameNode tackle Datanode failures in Hadoop?
What is difference between reducer and combiner?
what if job tracker machine is down?
What is Reducer in Hadoop?
How Hadoop is cost-effective?
What is meant by streaming access?
What does hadoop-metrics.properties file do?
Mention how many inputsplits is made by a hadoop framework?
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