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3.4 KiB
3.4 KiB
Kafka API Version Matrix Audit
Summary
This document audits the advertised API versions in handleApiVersions() against actual implementation support in validateAPIVersion() and handlers.
Current Status: ALL VERIFIED ✅
API Version Matrix
| API Key | API Name | Advertised | Validated | Handler Implemented | Status |
|---|---|---|---|---|---|
| 18 | ApiVersions | v0-v4 | v0-v4 | v0-v4 | ✅ Match |
| 3 | Metadata | v0-v7 | v0-v7 | v0-v7 | ✅ Match |
| 0 | Produce | v0-v7 | v0-v7 | v0-v7 | ✅ Match |
| 1 | Fetch | v0-v7 | v0-v7 | v0-v7 | ✅ Match |
| 2 | ListOffsets | v0-v2 | v0-v2 | v0-v2 | ✅ Match |
| 19 | CreateTopics | v0-v5 | v0-v5 | v0-v5 | ✅ Match |
| 20 | DeleteTopics | v0-v4 | v0-v4 | v0-v4 | ✅ Match |
| 10 | FindCoordinator | v0-v3 | v0-v3 | v0-v3 | ✅ Match |
| 11 | JoinGroup | v0-v6 | v0-v6 | v0-v6 | ✅ Match |
| 14 | SyncGroup | v0-v5 | v0-v5 | v0-v5 | ✅ Match |
| 8 | OffsetCommit | v0-v2 | v0-v2 | v0-v2 | ✅ Match |
| 9 | OffsetFetch | v0-v5 | v0-v5 | v0-v5 | ✅ Match |
| 12 | Heartbeat | v0-v4 | v0-v4 | v0-v4 | ✅ Match |
| 13 | LeaveGroup | v0-v4 | v0-v4 | v0-v4 | ✅ Match |
| 15 | DescribeGroups | v0-v5 | v0-v5 | v0-v5 | ✅ Match |
| 16 | ListGroups | v0-v4 | v0-v4 | v0-v4 | ✅ Match |
| 32 | DescribeConfigs | v0-v4 | v0-v4 | v0-v4 | ✅ Match |
| 22 | InitProducerId | v0-v4 | v0-v4 | v0-v4 | ✅ Match |
| 60 | DescribeCluster | v0-v1 | v0-v1 | v0-v1 | ✅ Match |
Implementation Details
Core APIs
- ApiVersions (v0-v4): Supports both flexible (v3+) and non-flexible formats. v4 added for Kafka 8.0.0 compatibility.
- Metadata (v0-v7): Full version support with flexible format in v7+
- Produce (v0-v7): Supports transactional writes and idempotent producers
- Fetch (v0-v7): Includes schema-aware fetching and multi-batch support
Consumer Group Coordination
- FindCoordinator (v0-v3): v3+ supports flexible format
- JoinGroup (v0-v6): Capped at v6 (first flexible version)
- SyncGroup (v0-v5): Full consumer group protocol support
- Heartbeat (v0-v4): Consumer group session management
- LeaveGroup (v0-v4): Clean consumer group exit
- OffsetCommit (v0-v2): Consumer offset persistence
- OffsetFetch (v0-v5): v3+ includes throttle_time_ms, v5+ includes leader_epoch
Topic Management
- CreateTopics (v0-v5): v2+ uses compact arrays and tagged fields
- DeleteTopics (v0-v4): Full topic deletion support
- ListOffsets (v0-v2): Offset listing for partitions
Admin & Discovery
- DescribeCluster (v0-v1): AdminClient compatibility (KIP-919)
- DescribeGroups (v0-v5): Consumer group introspection
- ListGroups (v0-v4): List all consumer groups
- DescribeConfigs (v0-v4): Configuration inspection
- InitProducerId (v0-v4): Transactional producer initialization
Verification Source
All version ranges verified from handler.go:
SupportedApiKeysarray (line 1196): Advertised versionsvalidateAPIVersion()function (line 2903): Validation ranges- Individual handler implementations: Actual version support
Last verified: 2025-10-13
Maintenance Notes
- After adding new API handlers, update all three locations:
SupportedApiKeysarrayvalidateAPIVersion()map- This documentation
- Test new versions with kafka-go and Sarama clients
- Ensure flexible format support for v3+ APIs where applicable