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What is Federation?
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What is the characteristic of streaming API that makes it flexible run MapReduce jobs in languages like Perl, Ruby, Awk etc.?
After the Map phase finishes, the Hadoop framework does 'Partitioning, Shuffle and sort'. Explain what happens in this phase?
What are input format, input split & record reader and what they do?
Explain how can you debug hadoop code?
What is rack awareness in hadoop?
What happens if one hadoop client renames a file or a directory containing this file while another client is still writing into it?
Mention what are the three modes in which hadoop can be run?
What is purpose of RecordWriter in Hadoop?
What does the high availability of a name-node means? How is it accomplished?
What are the differences between hadoop 1 and hadoop 2?
Why is checkpointing important in hadoop?
Can we deploy job tracker other than name node?
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