Question: Why did eBay need a Big Data solution? What are the common characteristics of emerging Big Data technologies? What is Hadoop? How does it work?

Why did eBay need a Big Data solution? What are the common characteristics of emerging Big Data technologies? What is Hadoop? How does it work?

What is MapReduce? What does it do? How does it do it? What are the main Hadoop components? What functions do they perform?

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