Chaos Engineering at Twilio with Ratequeue HA

Twilio engineers improved their core services' availability by implementing Chaos Engineering and Ratequeue HA, which eliminated the need for human intervention in common faults involving their queueing-and-rate-limiting system. The team designed a custom solution leveraging existing Twilio services to automate failover, detecting primary host failure, promoting a replica, and ensuring data integrity. They also implemented Ratequeue Chaos, a tool that simulates failures, monitors recovery, and validates the effectiveness of their automated failover system. This approach increased system resilience and availability, with the complete automated failover completing in under a minute after detection.

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