Facebook unveils Presto engine for querying 250 PB data warehouse – Old GigaOmAt a conference for developers at Facebook (s fb) headquarters on Thursday, engineers working for the social networking giant revealed that it’s using a new homemade query engine called Presto to do fast interactive analysis on its already enormous 250-petabyte-and-growing data warehouse. More than 850 Facebook employees use Presto every day, scanning 320 TB each day, engineer Martin Traverso said
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