Answer / Neeraj Kamal

A Map-Only job is a type of Hadoop job where only the Mapper is executed, and there are no Reducers. The output from the Mapper itself serves as the final result. This kind of job is used when the processing in the Mapper can produce the desired outcome without needing further aggregation or sorting.

Which operating system(s) are supported for production hadoop deployment?

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Is nosql follow relational db model?

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Are there any special requirements for namenode?

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How would you check whether your NameNode is working or not?

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What is Rack Awareness? What is its need in Hadoop?

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