How NameNode tackle Datanode failures in Hadoop?
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Can you explain combiner?
Mention what daemons run on a master node and slave nodes?
Can you define udf?
Explain is it possible to search for files using wildcards?
What does secondary name-node means?
What do you understand by standalone (or local) mode?
Is it possible to rename the output file, and if so, how?
How Hadoop’s CLASSPATH plays a vital role in starting or stopping in Hadoop daemons?
How namenode handles data node failures?
If DataNode increases, then do we need to upgrade NameNode?
What are the modes in which Hadoop run?
What mode(s) can hadoop code be run in?
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