Explain small file problem in hadoop
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What are input format, input split & record reader and what they do?
What does rack awareness algorithm means and why is it utilized as a part of hadoop?
What are the major differences between Hadoop 2 and Hadoop 3?
What is a udf?
List Hadoop’s three configuration files?
What is pseudo-distributed mode?
Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?
What do you know about yarn?
Is there another way to check whether Namenode is working?
What is a single point of failure in Hadoop 1 and how is it resolved in Hadoop 2?
What mode(s) can hadoop code be run in?
How Hadoop is cost-effective?
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