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Noticias de Alma, Corazón y Vida Sección Alma, Corazón y Vida
Our Mongo database is the source of truth for everything at Foursquare. How many users do we have? How many people are checked into JFK right now? What’s the most-liked tip left by a friend at this bar? Ask Mongo. However, the database has to stay extremely responsive to reads and writes at all times; no one wants their check ins to show up ten minutes after they happen! This means that more expensive queries (such as looking at every user joined with every venue they’ve visited) cannot happen on Mongo. So how do we answer these questions? We dump the data to Hadoop!