At Facebook,an Automated System for Verifying Configuration Value Errors Backfired,causing

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At Facebook,an automated system for verifying configuration value errors backfired,causing every single client to try to fix accurate data it perceived as invalid.Since the fix involved querying a cluster of databases,that cluster was quickly overwhelmed by hundreds of thousands of queries a second.The resultant crash took the Facebook system offline for two-and-a-half hours.