Clarify what is sequence file input format?
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How will you write a custom partitioner for a Hadoop job?
How many datanodes can run on a single Hadoop cluster?
What is Identity reducer?
What happens in text format?
Mention what is rack awareness?
What happen on the namenode when a client tries to read a data file?
Where is hadoop-env.sh file present?
What are the port numbers of job tracker?
What is single node cluster in Hadoop? for what all purposes Hadoop run on a single node cluster?
What is the difference between TextinputFormat and KeyValueTextInputFormat class?
How can you set an arbitrary number of mappers to be created for a job in Hadoop?
What is NameNode? How NameNode tackle Datanode failures in Hadoop?
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