"In the span of just a couple of years, Hadoop, a free software program named after a toy elephant, has taken over some of the world’s biggest Web sites. It controls the top search engines and determines the ads displayed next to the results. It decides what people see on Yahoo's homepage and finds long-lost friends on Facebook. It has achieved this by making it easier and cheaper than ever to analyze and access the unprecedented volumes of data churned out by the Internet. By mapping information spread across thousands of cheap computers and by creating an easier means for writing analytical queries, engineers no longer have to solve a grand computer science challenge every time they want to dig into data. Instead, they simply ask a question."
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