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chrislu
26acff4373
- Implement OffsetCommit API (key 8) for consumer offset persistence - Implement OffsetFetch API (key 9) for consumer offset retrieval - Add comprehensive offset management with group-level validation - Integrate offset storage with existing consumer group coordinator - Support offset retention, metadata, and leader epoch handling - Add partition assignment validation for offset commits - Update ApiVersions to advertise 11 APIs total (was 9) - Complete test suite with 14 new test cases covering: * Basic offset commit/fetch operations * Error conditions (invalid group, wrong generation, unknown member) * End-to-end offset persistence workflows * Request parsing and response building - All integration tests pass with updated API count (11 APIs) - E2E tests show '84 bytes' response (increased from 72 bytes) This completes consumer offset management, enabling Kafka clients to reliably track and persist their consumption progress across sessions.