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This flood of data is coming from many sources. Consider the following:[3]

  • The New York Stock Exchange generates about one terabyte of new trade data per day.

  • Facebook hosts approximately 10 billion photos, taking up one petabyte of storage.

  • Ancestry.com, the genealogy site, stores around 2.5 petabytes of data.

  • The Internet Archive stores around 2 petabytes of data and is growing at a rate of 20 terabytes per month.

  • The L...

From

Cover of Hadoop: The Definitive Guide, 3rd Edition

Note

Examples of data generation.