Answer / Km Gargi

Bad records during parsing can be handled by using techniques like error handling, validation checks, and filtering out incorrect data. In Hadoop, this can be achieved by writing custom InputFormat and OutputFormat classes that take care of bad record handling.

What happens if you don?t override the mapper methods and keep them as it is?

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Can you explain edge nodes in hadoop?

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What happens if number of reducers are 0?

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Explain map-only job?

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What jobtracker is in hadoop? What are the activities followed by hadoop?

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If the hadoop administrator needs to make a change, which configuration file does he need to change?

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What is Mapper in Hadoop?

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Give me examples of unstructured data?

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What are the different commands used to startup and shutdown Hadoop daemons?

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is there a standard procedure to deploy hadoop?

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Explain how Hadoop cluster hardware planning and provisioning is done?

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Is nosql follow relational db model?

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