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Which mode for which topic?
Compatibility modes
- Backward — new readers can read old data. Safe additions: optional fields with defaults, removed fields with defaults on the consumer.
- Forward — old readers can read new data. Safe additions: optional fields.
- Full — both. The strict mode for shared topics with many independent consumers.
Default to BACKWARD if a single team owns the consumers; pick FULL for platform topics consumed by other teams.
Evolve OrderPlaced — add a required field, the wrong way
Try to add a required field customer_tier (no default). Schema Registry should reject this under BACKWARD. The fix: give it a default.
💭Reflect
Pick the most-shared topic in your stack.
- ›Which compatibility mode is set today? Should it be tighter?
- ›Who owns the deprecation timeline for a field you'd love to remove?
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