Answer / Vijay Kumar Yadav

A Job consists of one or more Map tasks followed by one or more Reduce tasks. Each task processes a portion of the input data to produce output. In other words, a job is a high-level unit of work, while tasks are low-level units of computation.

Explain what is hadoop?

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What type of data hadoop can handle ?

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What is TaskTracker?

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Which are the three modes in which hadoop can be run?

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Can you explain the common input formats in hadoop?

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What is a commodity hardware? Does commodity hardware include RAM?

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What is the hadoop-core configuration?

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What are the major differences between Hadoop 2 and Hadoop 3?

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What is the purpose of RecordReader in hadoop?

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What are the core methods of a Reducer?

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Can hadoop replace relational database?

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What is the difference between TextInputFormat and KeyValueInputFormat class?

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