What can we learn from the Foursquare Incident?

Sharding is a great scalability solution, but as Foursquare recently revealed in a post-mortem about their 17 hours of downtime, sharding also has problems. MongoDB, the database Foursquare uses, also contributed their post-mortem of what went wrong too.
via High Scalability – Troubles with Sharding: What can we learn from the Foursquare Incident?.





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