Designing Sentry's cross-region replication
Blog post from Sentry
In designing a multi-region Sentry system, the team initially did not plan for cross-region data replication but later found it necessary to ensure efficient and correct operations, such as looking up an organization's region or validating API tokens. The solution required resiliency to network failures and the ability to backlog changes without system failure, leading to the adoption of a distributed systems pattern called transactional outboxes. This pattern ensures atomic operations and eventual consistency with at-least-once delivery semantics by storing changes in outboxes within the same transaction as the data change. Outboxes are processed using Remote Procedure Calls (RPC), and the design supports customer isolation by categorizing and sharding messages, allowing parallel processing. The team rejected other solutions, such as Postgres replication and Change Data Capture with Kafka, due to complexity and over-replication issues. To prevent consistency issues from forgotten outbox records, the team updated their ORM models and built tooling to audit SQL queries during tests. Despite challenges like webhook delivery latency and outbox loops, the outbox system has proved effective, delivering nearly 1 billion messages and enabling a gradual rollout that provided performance baselines and operational confidence.
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