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mq(kafka): Phase 3 Step 1 - Consumer Group Foundation
mq(kafka): Phase 3 Step 1 - Consumer Group Foundation
- Implement comprehensive consumer group coordinator with state management - Add JoinGroup API (key 11) for consumer group membership - Add SyncGroup API (key 14) for partition assignment coordination - Create Range and RoundRobin assignment strategies - Support consumer group lifecycle: Empty -> PreparingRebalance -> CompletingRebalance -> Stable - Add automatic member cleanup and expired session handling - Comprehensive test coverage for consumer groups, assignment strategies - Update ApiVersions to advertise 9 APIs total (was 7) - All existing integration tests pass with new consumer group support This provides the foundation for distributed Kafka consumers with automatic partition rebalancing and group coordination, compatible with standard Kafka clients.pull/7231/head
chrislu
2 months ago
16 changed files with 2374 additions and 317 deletions
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46test/kafka/seaweedmq_integration_test.go
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92weed/command/mq_kafka_gateway.go
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242weed/mq/KAFKA_PHASE3_PLAN.md
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289weed/mq/kafka/consumer/assignment.go
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359weed/mq/kafka/consumer/assignment_test.go
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298weed/mq/kafka/consumer/group_coordinator.go
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219weed/mq/kafka/consumer/group_coordinator_test.go
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14weed/mq/kafka/gateway/server.go
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108weed/mq/kafka/integration/agent_client.go
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50weed/mq/kafka/integration/agent_client_test.go
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114weed/mq/kafka/integration/seaweedmq_handler.go
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100weed/mq/kafka/integration/seaweedmq_handler_test.go
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38weed/mq/kafka/protocol/handler.go
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10weed/mq/kafka/protocol/handler_test.go
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626weed/mq/kafka/protocol/joingroup.go
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86weed/mq/kafka/protocol/produce.go
@ -0,0 +1,242 @@ |
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# Phase 3: Consumer Groups & Advanced Kafka Features |
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|
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## Overview |
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|
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Phase 3 transforms the Kafka Gateway from a basic producer/consumer system into a full-featured, production-ready Kafka-compatible platform with consumer groups, advanced APIs, and enterprise features. |
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|
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## Goals |
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- **Consumer Group Coordination**: Full distributed consumer support |
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- **Advanced Kafka APIs**: Offset management, group coordination, heartbeats |
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- **Performance & Scalability**: Connection pooling, batching, compression |
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- **Production Features**: Metrics, monitoring, advanced configuration |
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- **Enterprise Ready**: Security, observability, operational tools |
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|
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## Core Features |
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|
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### 1. Consumer Group Coordination |
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|
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**New Kafka APIs to Implement:** |
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- **JoinGroup** (API 11): Consumer joins a consumer group |
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- **SyncGroup** (API 14): Coordinate partition assignments |
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- **Heartbeat** (API 12): Keep consumer alive in group |
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- **LeaveGroup** (API 13): Clean consumer departure |
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- **OffsetCommit** (API 8): Commit consumer offsets |
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- **OffsetFetch** (API 9): Retrieve committed offsets |
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- **DescribeGroups** (API 15): Get group metadata |
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|
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**Consumer Group Manager:** |
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- Group membership tracking |
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- Partition assignment strategies (Range, RoundRobin) |
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- Rebalancing coordination |
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- Offset storage and retrieval |
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- Consumer liveness monitoring |
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|
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### 2. Advanced Record Processing |
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|
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**Record Batch Improvements:** |
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- Full Kafka record format parsing (v0, v1, v2) |
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- Compression support (gzip, snappy, lz4, zstd) |
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- Proper CRC validation |
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- Transaction markers handling |
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- Timestamp extraction and validation |
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|
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**Performance Optimizations:** |
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- Record batching for SeaweedMQ |
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- Connection pooling to Agent |
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- Async publishing with acknowledgment batching |
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- Memory pooling for large messages |
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|
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### 3. Enhanced Protocol Support |
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|
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**Additional APIs:** |
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- **FindCoordinator** (API 10): Locate group coordinator |
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- **DescribeConfigs** (API 32): Get broker/topic configs |
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- **AlterConfigs** (API 33): Modify configurations |
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- **DescribeLogDirs** (API 35): Storage information |
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- **CreatePartitions** (API 37): Dynamic partition scaling |
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|
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**Protocol Improvements:** |
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- Multiple API version support |
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- Better error code mapping |
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- Request/response correlation tracking |
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- Protocol version negotiation |
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|
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### 4. Operational Features |
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**Metrics & Monitoring:** |
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- Prometheus metrics endpoint |
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- Consumer group lag monitoring |
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- Throughput and latency metrics |
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- Error rate tracking |
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- Connection pool metrics |
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**Health & Diagnostics:** |
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- Health check endpoints |
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- Debug APIs for troubleshooting |
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- Consumer group status reporting |
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- Partition assignment visualization |
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|
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**Configuration Management:** |
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- Dynamic configuration updates |
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- Topic-level settings |
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- Consumer group policies |
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- Rate limiting and quotas |
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|
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## Implementation Plan |
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|
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### Step 1: Consumer Group Foundation (2-3 days) |
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1. Consumer group state management |
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2. Basic JoinGroup/SyncGroup APIs |
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3. Partition assignment logic |
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4. Group membership tracking |
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|
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### Step 2: Offset Management (1-2 days) |
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1. OffsetCommit/OffsetFetch APIs |
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2. Offset storage in SeaweedMQ |
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3. Consumer position tracking |
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4. Offset retention policies |
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|
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### Step 3: Consumer Coordination (1-2 days) |
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1. Heartbeat mechanism |
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2. Group rebalancing |
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3. Consumer failure detection |
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4. LeaveGroup handling |
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### Step 4: Advanced Record Processing (2-3 days) |
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1. Full record batch parsing |
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2. Compression codec support |
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3. Performance optimizations |
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4. Memory management |
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|
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### Step 5: Enhanced APIs (1-2 days) |
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1. FindCoordinator implementation |
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2. DescribeGroups functionality |
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3. Configuration APIs |
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4. Administrative tools |
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|
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### Step 6: Production Features (2-3 days) |
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1. Metrics and monitoring |
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2. Health checks |
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3. Operational dashboards |
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4. Performance tuning |
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|
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## Architecture Changes |
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|
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### Consumer Group Coordinator |
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``` |
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┌─────────────────────────────────────────────────┐ |
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│ Gateway Server │ |
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├─────────────────────────────────────────────────┤ |
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│ Protocol Handler │ |
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│ ├── Consumer Group Coordinator │ |
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│ │ ├── Group State Machine │ |
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│ │ ├── Partition Assignment │ |
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│ │ ├── Rebalancing Logic │ |
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│ │ └── Offset Manager │ |
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│ ├── Enhanced Record Processor │ |
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│ └── Metrics Collector │ |
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├─────────────────────────────────────────────────┤ |
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│ SeaweedMQ Integration Layer │ |
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│ ├── Connection Pool │ |
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│ ├── Batch Publisher │ |
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│ └── Offset Storage │ |
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└─────────────────────────────────────────────────┘ |
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``` |
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### Consumer Group State Management |
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``` |
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Consumer Group States: |
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- Empty: No active consumers |
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- PreparingRebalance: Waiting for consumers to join |
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- CompletingRebalance: Assigning partitions |
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- Stable: Normal operation |
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- Dead: Group marked for deletion |
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Consumer States: |
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- Unknown: Initial state |
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- MemberPending: Joining group |
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- MemberStable: Active in group |
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- MemberLeaving: Graceful departure |
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``` |
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## Success Criteria |
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### Functional Requirements |
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- ✅ Consumer groups work with multiple consumers |
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- ✅ Automatic partition rebalancing |
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- ✅ Offset commit/fetch functionality |
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- ✅ Consumer failure handling |
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- ✅ Full Kafka record format support |
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- ✅ Compression support for major codecs |
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### Performance Requirements |
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- ✅ Handle 10k+ messages/second per partition |
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- ✅ Support 100+ consumer groups simultaneously |
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- ✅ Sub-100ms consumer group rebalancing |
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- ✅ Memory usage < 1GB for 1000 consumers |
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### Compatibility Requirements |
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- ✅ Compatible with kafka-go, Sarama, and other Go clients |
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- ✅ Support Kafka 2.8+ client protocol versions |
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- ✅ Backwards compatible with Phase 1&2 implementations |
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|
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## Testing Strategy |
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### Unit Tests |
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- Consumer group state transitions |
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- Partition assignment algorithms |
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- Offset management logic |
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- Record parsing and validation |
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### Integration Tests |
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- Multi-consumer group scenarios |
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- Consumer failures and recovery |
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- Rebalancing under load |
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- SeaweedMQ storage integration |
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### End-to-End Tests |
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- Real Kafka client libraries (kafka-go, Sarama) |
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- Producer/consumer workflows |
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- Consumer group coordination |
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- Performance benchmarking |
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|
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### Load Tests |
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- 1000+ concurrent consumers |
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- High-throughput scenarios |
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- Memory and CPU profiling |
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- Failure recovery testing |
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|
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## Deliverables |
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|
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1. **Consumer Group Coordinator** - Full group management system |
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2. **Enhanced Protocol Handler** - 13+ Kafka APIs supported |
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3. **Advanced Record Processing** - Compression, batching, validation |
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4. **Metrics & Monitoring** - Prometheus integration, dashboards |
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5. **Performance Optimizations** - Connection pooling, memory management |
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6. **Comprehensive Testing** - Unit, integration, E2E, and load tests |
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7. **Documentation** - API docs, deployment guides, troubleshooting |
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|
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## Risk Mitigation |
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### Technical Risks |
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- **Consumer group complexity**: Start with basic Range assignment, expand gradually |
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- **Performance bottlenecks**: Profile early, optimize incrementally |
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- **SeaweedMQ integration**: Maintain compatibility layer for fallback |
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### Operational Risks |
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- **Breaking changes**: Maintain Phase 2 compatibility throughout |
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- **Resource usage**: Implement proper resource limits and monitoring |
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- **Data consistency**: Ensure offset storage reliability |
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|
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## Post-Phase 3 Vision |
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After Phase 3, the SeaweedFS Kafka Gateway will be: |
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- **Production Ready**: Handle enterprise Kafka workloads |
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- **Highly Compatible**: Work with major Kafka client libraries |
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- **Operationally Excellent**: Full observability and management tools |
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- **Performant**: Meet enterprise throughput requirements |
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- **Reliable**: Handle failures gracefully with strong consistency guarantees |
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This positions SeaweedFS as a compelling alternative to traditional Kafka deployments, especially for organizations already using SeaweedFS for storage and wanting unified message queue capabilities. |
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@ -0,0 +1,289 @@ |
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package consumer |
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import ( |
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"sort" |
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) |
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// AssignmentStrategy defines how partitions are assigned to consumers
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type AssignmentStrategy interface { |
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Name() string |
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Assign(members []*GroupMember, topicPartitions map[string][]int32) map[string][]PartitionAssignment |
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} |
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// RangeAssignmentStrategy implements the Range assignment strategy
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// Assigns partitions in ranges to consumers, similar to Kafka's range assignor
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type RangeAssignmentStrategy struct{} |
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func (r *RangeAssignmentStrategy) Name() string { |
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return "range" |
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} |
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func (r *RangeAssignmentStrategy) Assign(members []*GroupMember, topicPartitions map[string][]int32) map[string][]PartitionAssignment { |
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if len(members) == 0 { |
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return make(map[string][]PartitionAssignment) |
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} |
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assignments := make(map[string][]PartitionAssignment) |
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for _, member := range members { |
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assignments[member.ID] = make([]PartitionAssignment, 0) |
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} |
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|
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// Sort members for consistent assignment
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sortedMembers := make([]*GroupMember, len(members)) |
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copy(sortedMembers, members) |
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sort.Slice(sortedMembers, func(i, j int) bool { |
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return sortedMembers[i].ID < sortedMembers[j].ID |
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}) |
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|
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// Get all subscribed topics
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subscribedTopics := make(map[string]bool) |
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for _, member := range members { |
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for _, topic := range member.Subscription { |
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subscribedTopics[topic] = true |
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} |
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} |
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|
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// Assign partitions for each topic
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for topic := range subscribedTopics { |
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partitions, exists := topicPartitions[topic] |
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if !exists { |
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continue |
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} |
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|
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// Sort partitions for consistent assignment
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sort.Slice(partitions, func(i, j int) bool { |
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return partitions[i] < partitions[j] |
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}) |
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|
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// Find members subscribed to this topic
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topicMembers := make([]*GroupMember, 0) |
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for _, member := range sortedMembers { |
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for _, subscribedTopic := range member.Subscription { |
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if subscribedTopic == topic { |
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topicMembers = append(topicMembers, member) |
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break |
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} |
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} |
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} |
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if len(topicMembers) == 0 { |
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continue |
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} |
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// Assign partitions to members using range strategy
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numPartitions := len(partitions) |
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numMembers := len(topicMembers) |
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partitionsPerMember := numPartitions / numMembers |
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remainingPartitions := numPartitions % numMembers |
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partitionIndex := 0 |
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for memberIndex, member := range topicMembers { |
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// Calculate how many partitions this member should get
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memberPartitions := partitionsPerMember |
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if memberIndex < remainingPartitions { |
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memberPartitions++ |
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} |
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// Assign partitions to this member
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for i := 0; i < memberPartitions && partitionIndex < numPartitions; i++ { |
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assignment := PartitionAssignment{ |
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Topic: topic, |
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Partition: partitions[partitionIndex], |
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} |
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assignments[member.ID] = append(assignments[member.ID], assignment) |
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partitionIndex++ |
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} |
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} |
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} |
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return assignments |
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} |
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// RoundRobinAssignmentStrategy implements the RoundRobin assignment strategy
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// Distributes partitions evenly across all consumers in round-robin fashion
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type RoundRobinAssignmentStrategy struct{} |
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func (rr *RoundRobinAssignmentStrategy) Name() string { |
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return "roundrobin" |
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} |
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func (rr *RoundRobinAssignmentStrategy) Assign(members []*GroupMember, topicPartitions map[string][]int32) map[string][]PartitionAssignment { |
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if len(members) == 0 { |
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return make(map[string][]PartitionAssignment) |
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} |
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assignments := make(map[string][]PartitionAssignment) |
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for _, member := range members { |
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assignments[member.ID] = make([]PartitionAssignment, 0) |
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} |
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|
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// Sort members for consistent assignment
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sortedMembers := make([]*GroupMember, len(members)) |
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copy(sortedMembers, members) |
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sort.Slice(sortedMembers, func(i, j int) bool { |
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return sortedMembers[i].ID < sortedMembers[j].ID |
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}) |
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|
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// Collect all partition assignments across all topics
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allAssignments := make([]PartitionAssignment, 0) |
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|
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// Get all subscribed topics
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subscribedTopics := make(map[string]bool) |
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for _, member := range members { |
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for _, topic := range member.Subscription { |
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subscribedTopics[topic] = true |
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} |
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} |
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// Collect all partitions from all subscribed topics
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for topic := range subscribedTopics { |
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partitions, exists := topicPartitions[topic] |
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if !exists { |
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continue |
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} |
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for _, partition := range partitions { |
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allAssignments = append(allAssignments, PartitionAssignment{ |
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Topic: topic, |
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Partition: partition, |
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}) |
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} |
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} |
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|
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// Sort assignments for consistent distribution
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sort.Slice(allAssignments, func(i, j int) bool { |
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if allAssignments[i].Topic != allAssignments[j].Topic { |
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return allAssignments[i].Topic < allAssignments[j].Topic |
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} |
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return allAssignments[i].Partition < allAssignments[j].Partition |
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}) |
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|
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// Distribute partitions in round-robin fashion
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memberIndex := 0 |
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for _, assignment := range allAssignments { |
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// Find a member that is subscribed to this topic
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assigned := false |
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startIndex := memberIndex |
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for !assigned { |
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member := sortedMembers[memberIndex] |
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|
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// Check if this member is subscribed to the topic
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subscribed := false |
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for _, topic := range member.Subscription { |
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if topic == assignment.Topic { |
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subscribed = true |
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break |
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} |
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} |
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|
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if subscribed { |
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assignments[member.ID] = append(assignments[member.ID], assignment) |
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assigned = true |
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} |
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memberIndex = (memberIndex + 1) % len(sortedMembers) |
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|
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// Prevent infinite loop if no member is subscribed to this topic
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if memberIndex == startIndex && !assigned { |
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break |
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} |
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} |
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} |
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return assignments |
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} |
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|
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// GetAssignmentStrategy returns the appropriate assignment strategy
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func GetAssignmentStrategy(name string) AssignmentStrategy { |
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switch name { |
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case "range": |
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return &RangeAssignmentStrategy{} |
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case "roundrobin": |
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return &RoundRobinAssignmentStrategy{} |
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default: |
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// Default to range strategy
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return &RangeAssignmentStrategy{} |
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} |
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} |
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|
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// AssignPartitions performs partition assignment for a consumer group
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func (group *ConsumerGroup) AssignPartitions(topicPartitions map[string][]int32) { |
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if len(group.Members) == 0 { |
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return |
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} |
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|
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// Convert members map to slice
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members := make([]*GroupMember, 0, len(group.Members)) |
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for _, member := range group.Members { |
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if member.State == MemberStateStable || member.State == MemberStatePending { |
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members = append(members, member) |
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} |
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} |
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|
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if len(members) == 0 { |
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return |
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} |
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|
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// Get assignment strategy
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strategy := GetAssignmentStrategy(group.Protocol) |
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assignments := strategy.Assign(members, topicPartitions) |
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|
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// Apply assignments to members
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for memberID, assignment := range assignments { |
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if member, exists := group.Members[memberID]; exists { |
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member.Assignment = assignment |
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} |
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} |
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} |
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|
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// GetMemberAssignments returns the current partition assignments for all members
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func (group *ConsumerGroup) GetMemberAssignments() map[string][]PartitionAssignment { |
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group.Mu.RLock() |
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defer group.Mu.RUnlock() |
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|
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assignments := make(map[string][]PartitionAssignment) |
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for memberID, member := range group.Members { |
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assignments[memberID] = make([]PartitionAssignment, len(member.Assignment)) |
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copy(assignments[memberID], member.Assignment) |
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} |
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|
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return assignments |
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} |
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|
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// UpdateMemberSubscription updates a member's topic subscription
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func (group *ConsumerGroup) UpdateMemberSubscription(memberID string, topics []string) { |
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group.Mu.Lock() |
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defer group.Mu.Unlock() |
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|
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member, exists := group.Members[memberID] |
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if !exists { |
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return |
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} |
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|
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// Update member subscription
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member.Subscription = make([]string, len(topics)) |
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copy(member.Subscription, topics) |
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|
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// Update group's subscribed topics
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group.SubscribedTopics = make(map[string]bool) |
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for _, m := range group.Members { |
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for _, topic := range m.Subscription { |
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group.SubscribedTopics[topic] = true |
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} |
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} |
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} |
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|
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// GetSubscribedTopics returns all topics subscribed by the group
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func (group *ConsumerGroup) GetSubscribedTopics() []string { |
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group.Mu.RLock() |
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defer group.Mu.RUnlock() |
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|
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topics := make([]string, 0, len(group.SubscribedTopics)) |
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for topic := range group.SubscribedTopics { |
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topics = append(topics, topic) |
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} |
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|
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sort.Strings(topics) |
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return topics |
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} |
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@ -0,0 +1,359 @@ |
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package consumer |
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|
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import ( |
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"reflect" |
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"sort" |
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"testing" |
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) |
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|
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func TestRangeAssignmentStrategy(t *testing.T) { |
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strategy := &RangeAssignmentStrategy{} |
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|
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if strategy.Name() != "range" { |
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t.Errorf("Expected strategy name 'range', got '%s'", strategy.Name()) |
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} |
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|
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// Test with 2 members, 4 partitions on one topic
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members := []*GroupMember{ |
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{ |
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ID: "member1", |
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Subscription: []string{"topic1"}, |
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}, |
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{ |
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ID: "member2", |
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Subscription: []string{"topic1"}, |
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}, |
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} |
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|
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topicPartitions := map[string][]int32{ |
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"topic1": {0, 1, 2, 3}, |
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} |
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|
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assignments := strategy.Assign(members, topicPartitions) |
|||
|
|||
// Verify all members have assignments
|
|||
if len(assignments) != 2 { |
|||
t.Fatalf("Expected assignments for 2 members, got %d", len(assignments)) |
|||
} |
|||
|
|||
// Verify total partitions assigned
|
|||
totalAssigned := 0 |
|||
for _, assignment := range assignments { |
|||
totalAssigned += len(assignment) |
|||
} |
|||
|
|||
if totalAssigned != 4 { |
|||
t.Errorf("Expected 4 total partitions assigned, got %d", totalAssigned) |
|||
} |
|||
|
|||
// Range assignment should distribute evenly: 2 partitions each
|
|||
for memberID, assignment := range assignments { |
|||
if len(assignment) != 2 { |
|||
t.Errorf("Expected 2 partitions for member %s, got %d", memberID, len(assignment)) |
|||
} |
|||
|
|||
// Verify all assignments are for the subscribed topic
|
|||
for _, pa := range assignment { |
|||
if pa.Topic != "topic1" { |
|||
t.Errorf("Expected topic 'topic1', got '%s'", pa.Topic) |
|||
} |
|||
} |
|||
} |
|||
} |
|||
|
|||
func TestRangeAssignmentStrategy_UnevenPartitions(t *testing.T) { |
|||
strategy := &RangeAssignmentStrategy{} |
|||
|
|||
// Test with 3 members, 4 partitions - should distribute 2,1,1
|
|||
members := []*GroupMember{ |
|||
{ID: "member1", Subscription: []string{"topic1"}}, |
|||
{ID: "member2", Subscription: []string{"topic1"}}, |
|||
{ID: "member3", Subscription: []string{"topic1"}}, |
|||
} |
|||
|
|||
topicPartitions := map[string][]int32{ |
|||
"topic1": {0, 1, 2, 3}, |
|||
} |
|||
|
|||
assignments := strategy.Assign(members, topicPartitions) |
|||
|
|||
// Get assignment counts
|
|||
counts := make([]int, 0, 3) |
|||
for _, assignment := range assignments { |
|||
counts = append(counts, len(assignment)) |
|||
} |
|||
sort.Ints(counts) |
|||
|
|||
// Should be distributed as [1, 1, 2] (first member gets extra partition)
|
|||
expected := []int{1, 1, 2} |
|||
if !reflect.DeepEqual(counts, expected) { |
|||
t.Errorf("Expected partition distribution %v, got %v", expected, counts) |
|||
} |
|||
} |
|||
|
|||
func TestRangeAssignmentStrategy_MultipleTopics(t *testing.T) { |
|||
strategy := &RangeAssignmentStrategy{} |
|||
|
|||
members := []*GroupMember{ |
|||
{ID: "member1", Subscription: []string{"topic1", "topic2"}}, |
|||
{ID: "member2", Subscription: []string{"topic1"}}, |
|||
} |
|||
|
|||
topicPartitions := map[string][]int32{ |
|||
"topic1": {0, 1}, |
|||
"topic2": {0, 1}, |
|||
} |
|||
|
|||
assignments := strategy.Assign(members, topicPartitions) |
|||
|
|||
// Member1 should get assignments from both topics
|
|||
member1Assignments := assignments["member1"] |
|||
topicsAssigned := make(map[string]int) |
|||
for _, pa := range member1Assignments { |
|||
topicsAssigned[pa.Topic]++ |
|||
} |
|||
|
|||
if len(topicsAssigned) != 2 { |
|||
t.Errorf("Expected member1 to be assigned to 2 topics, got %d", len(topicsAssigned)) |
|||
} |
|||
|
|||
// Member2 should only get topic1 assignments
|
|||
member2Assignments := assignments["member2"] |
|||
for _, pa := range member2Assignments { |
|||
if pa.Topic != "topic1" { |
|||
t.Errorf("Expected member2 to only get topic1, but got %s", pa.Topic) |
|||
} |
|||
} |
|||
} |
|||
|
|||
func TestRoundRobinAssignmentStrategy(t *testing.T) { |
|||
strategy := &RoundRobinAssignmentStrategy{} |
|||
|
|||
if strategy.Name() != "roundrobin" { |
|||
t.Errorf("Expected strategy name 'roundrobin', got '%s'", strategy.Name()) |
|||
} |
|||
|
|||
// Test with 2 members, 4 partitions on one topic
|
|||
members := []*GroupMember{ |
|||
{ID: "member1", Subscription: []string{"topic1"}}, |
|||
{ID: "member2", Subscription: []string{"topic1"}}, |
|||
} |
|||
|
|||
topicPartitions := map[string][]int32{ |
|||
"topic1": {0, 1, 2, 3}, |
|||
} |
|||
|
|||
assignments := strategy.Assign(members, topicPartitions) |
|||
|
|||
// Verify all members have assignments
|
|||
if len(assignments) != 2 { |
|||
t.Fatalf("Expected assignments for 2 members, got %d", len(assignments)) |
|||
} |
|||
|
|||
// Verify total partitions assigned
|
|||
totalAssigned := 0 |
|||
for _, assignment := range assignments { |
|||
totalAssigned += len(assignment) |
|||
} |
|||
|
|||
if totalAssigned != 4 { |
|||
t.Errorf("Expected 4 total partitions assigned, got %d", totalAssigned) |
|||
} |
|||
|
|||
// Round robin should distribute evenly: 2 partitions each
|
|||
for memberID, assignment := range assignments { |
|||
if len(assignment) != 2 { |
|||
t.Errorf("Expected 2 partitions for member %s, got %d", memberID, len(assignment)) |
|||
} |
|||
} |
|||
} |
|||
|
|||
func TestRoundRobinAssignmentStrategy_MultipleTopics(t *testing.T) { |
|||
strategy := &RoundRobinAssignmentStrategy{} |
|||
|
|||
members := []*GroupMember{ |
|||
{ID: "member1", Subscription: []string{"topic1", "topic2"}}, |
|||
{ID: "member2", Subscription: []string{"topic1", "topic2"}}, |
|||
} |
|||
|
|||
topicPartitions := map[string][]int32{ |
|||
"topic1": {0, 1}, |
|||
"topic2": {0, 1}, |
|||
} |
|||
|
|||
assignments := strategy.Assign(members, topicPartitions) |
|||
|
|||
// Each member should get 2 partitions (round robin across topics)
|
|||
for memberID, assignment := range assignments { |
|||
if len(assignment) != 2 { |
|||
t.Errorf("Expected 2 partitions for member %s, got %d", memberID, len(assignment)) |
|||
} |
|||
} |
|||
|
|||
// Verify no partition is assigned twice
|
|||
assignedPartitions := make(map[string]map[int32]bool) |
|||
for _, assignment := range assignments { |
|||
for _, pa := range assignment { |
|||
if assignedPartitions[pa.Topic] == nil { |
|||
assignedPartitions[pa.Topic] = make(map[int32]bool) |
|||
} |
|||
if assignedPartitions[pa.Topic][pa.Partition] { |
|||
t.Errorf("Partition %d of topic %s assigned multiple times", pa.Partition, pa.Topic) |
|||
} |
|||
assignedPartitions[pa.Topic][pa.Partition] = true |
|||
} |
|||
} |
|||
} |
|||
|
|||
func TestGetAssignmentStrategy(t *testing.T) { |
|||
rangeStrategy := GetAssignmentStrategy("range") |
|||
if rangeStrategy.Name() != "range" { |
|||
t.Errorf("Expected range strategy, got %s", rangeStrategy.Name()) |
|||
} |
|||
|
|||
rrStrategy := GetAssignmentStrategy("roundrobin") |
|||
if rrStrategy.Name() != "roundrobin" { |
|||
t.Errorf("Expected roundrobin strategy, got %s", rrStrategy.Name()) |
|||
} |
|||
|
|||
// Unknown strategy should default to range
|
|||
defaultStrategy := GetAssignmentStrategy("unknown") |
|||
if defaultStrategy.Name() != "range" { |
|||
t.Errorf("Expected default strategy to be range, got %s", defaultStrategy.Name()) |
|||
} |
|||
} |
|||
|
|||
func TestConsumerGroup_AssignPartitions(t *testing.T) { |
|||
group := &ConsumerGroup{ |
|||
ID: "test-group", |
|||
Protocol: "range", |
|||
Members: map[string]*GroupMember{ |
|||
"member1": { |
|||
ID: "member1", |
|||
Subscription: []string{"topic1"}, |
|||
State: MemberStateStable, |
|||
}, |
|||
"member2": { |
|||
ID: "member2", |
|||
Subscription: []string{"topic1"}, |
|||
State: MemberStateStable, |
|||
}, |
|||
}, |
|||
} |
|||
|
|||
topicPartitions := map[string][]int32{ |
|||
"topic1": {0, 1, 2, 3}, |
|||
} |
|||
|
|||
group.AssignPartitions(topicPartitions) |
|||
|
|||
// Verify assignments were created
|
|||
for memberID, member := range group.Members { |
|||
if len(member.Assignment) == 0 { |
|||
t.Errorf("Expected member %s to have partition assignments", memberID) |
|||
} |
|||
|
|||
// Verify all assignments are valid
|
|||
for _, pa := range member.Assignment { |
|||
if pa.Topic != "topic1" { |
|||
t.Errorf("Unexpected topic assignment: %s", pa.Topic) |
|||
} |
|||
if pa.Partition < 0 || pa.Partition >= 4 { |
|||
t.Errorf("Unexpected partition assignment: %d", pa.Partition) |
|||
} |
|||
} |
|||
} |
|||
} |
|||
|
|||
func TestConsumerGroup_GetMemberAssignments(t *testing.T) { |
|||
group := &ConsumerGroup{ |
|||
Members: map[string]*GroupMember{ |
|||
"member1": { |
|||
ID: "member1", |
|||
Assignment: []PartitionAssignment{ |
|||
{Topic: "topic1", Partition: 0}, |
|||
{Topic: "topic1", Partition: 1}, |
|||
}, |
|||
}, |
|||
}, |
|||
} |
|||
|
|||
assignments := group.GetMemberAssignments() |
|||
|
|||
if len(assignments) != 1 { |
|||
t.Fatalf("Expected 1 member assignment, got %d", len(assignments)) |
|||
} |
|||
|
|||
member1Assignments := assignments["member1"] |
|||
if len(member1Assignments) != 2 { |
|||
t.Errorf("Expected 2 partition assignments for member1, got %d", len(member1Assignments)) |
|||
} |
|||
|
|||
// Verify assignment content
|
|||
expectedAssignments := []PartitionAssignment{ |
|||
{Topic: "topic1", Partition: 0}, |
|||
{Topic: "topic1", Partition: 1}, |
|||
} |
|||
|
|||
if !reflect.DeepEqual(member1Assignments, expectedAssignments) { |
|||
t.Errorf("Expected assignments %v, got %v", expectedAssignments, member1Assignments) |
|||
} |
|||
} |
|||
|
|||
func TestConsumerGroup_UpdateMemberSubscription(t *testing.T) { |
|||
group := &ConsumerGroup{ |
|||
Members: map[string]*GroupMember{ |
|||
"member1": { |
|||
ID: "member1", |
|||
Subscription: []string{"topic1"}, |
|||
}, |
|||
"member2": { |
|||
ID: "member2", |
|||
Subscription: []string{"topic2"}, |
|||
}, |
|||
}, |
|||
SubscribedTopics: map[string]bool{ |
|||
"topic1": true, |
|||
"topic2": true, |
|||
}, |
|||
} |
|||
|
|||
// Update member1's subscription
|
|||
group.UpdateMemberSubscription("member1", []string{"topic1", "topic3"}) |
|||
|
|||
// Verify member subscription updated
|
|||
member1 := group.Members["member1"] |
|||
expectedSubscription := []string{"topic1", "topic3"} |
|||
if !reflect.DeepEqual(member1.Subscription, expectedSubscription) { |
|||
t.Errorf("Expected subscription %v, got %v", expectedSubscription, member1.Subscription) |
|||
} |
|||
|
|||
// Verify group subscribed topics updated
|
|||
expectedGroupTopics := []string{"topic1", "topic2", "topic3"} |
|||
actualGroupTopics := group.GetSubscribedTopics() |
|||
|
|||
if !reflect.DeepEqual(actualGroupTopics, expectedGroupTopics) { |
|||
t.Errorf("Expected group topics %v, got %v", expectedGroupTopics, actualGroupTopics) |
|||
} |
|||
} |
|||
|
|||
func TestAssignmentStrategy_EmptyMembers(t *testing.T) { |
|||
rangeStrategy := &RangeAssignmentStrategy{} |
|||
rrStrategy := &RoundRobinAssignmentStrategy{} |
|||
|
|||
topicPartitions := map[string][]int32{ |
|||
"topic1": {0, 1, 2, 3}, |
|||
} |
|||
|
|||
// Both strategies should handle empty members gracefully
|
|||
rangeAssignments := rangeStrategy.Assign([]*GroupMember{}, topicPartitions) |
|||
rrAssignments := rrStrategy.Assign([]*GroupMember{}, topicPartitions) |
|||
|
|||
if len(rangeAssignments) != 0 { |
|||
t.Error("Expected empty assignments for empty members list (range)") |
|||
} |
|||
|
|||
if len(rrAssignments) != 0 { |
|||
t.Error("Expected empty assignments for empty members list (round robin)") |
|||
} |
|||
} |
|||
@ -0,0 +1,298 @@ |
|||
package consumer |
|||
|
|||
import ( |
|||
"fmt" |
|||
"sync" |
|||
"time" |
|||
) |
|||
|
|||
// GroupState represents the state of a consumer group
|
|||
type GroupState int |
|||
|
|||
const ( |
|||
GroupStateEmpty GroupState = iota |
|||
GroupStatePreparingRebalance |
|||
GroupStateCompletingRebalance |
|||
GroupStateStable |
|||
GroupStateDead |
|||
) |
|||
|
|||
func (gs GroupState) String() string { |
|||
switch gs { |
|||
case GroupStateEmpty: |
|||
return "Empty" |
|||
case GroupStatePreparingRebalance: |
|||
return "PreparingRebalance" |
|||
case GroupStateCompletingRebalance: |
|||
return "CompletingRebalance" |
|||
case GroupStateStable: |
|||
return "Stable" |
|||
case GroupStateDead: |
|||
return "Dead" |
|||
default: |
|||
return "Unknown" |
|||
} |
|||
} |
|||
|
|||
// MemberState represents the state of a group member
|
|||
type MemberState int |
|||
|
|||
const ( |
|||
MemberStateUnknown MemberState = iota |
|||
MemberStatePending |
|||
MemberStateStable |
|||
MemberStateLeaving |
|||
) |
|||
|
|||
func (ms MemberState) String() string { |
|||
switch ms { |
|||
case MemberStateUnknown: |
|||
return "Unknown" |
|||
case MemberStatePending: |
|||
return "Pending" |
|||
case MemberStateStable: |
|||
return "Stable" |
|||
case MemberStateLeaving: |
|||
return "Leaving" |
|||
default: |
|||
return "Unknown" |
|||
} |
|||
} |
|||
|
|||
// GroupMember represents a consumer in a consumer group
|
|||
type GroupMember struct { |
|||
ID string // Member ID (generated by gateway)
|
|||
ClientID string // Client ID from consumer
|
|||
ClientHost string // Client host/IP
|
|||
SessionTimeout int32 // Session timeout in milliseconds
|
|||
RebalanceTimeout int32 // Rebalance timeout in milliseconds
|
|||
Subscription []string // Subscribed topics
|
|||
Assignment []PartitionAssignment // Assigned partitions
|
|||
Metadata []byte // Protocol-specific metadata
|
|||
State MemberState // Current member state
|
|||
LastHeartbeat time.Time // Last heartbeat timestamp
|
|||
JoinedAt time.Time // When member joined group
|
|||
} |
|||
|
|||
// PartitionAssignment represents partition assignment for a member
|
|||
type PartitionAssignment struct { |
|||
Topic string |
|||
Partition int32 |
|||
} |
|||
|
|||
// ConsumerGroup represents a Kafka consumer group
|
|||
type ConsumerGroup struct { |
|||
ID string // Group ID
|
|||
State GroupState // Current group state
|
|||
Generation int32 // Generation ID (incremented on rebalance)
|
|||
Protocol string // Assignment protocol (e.g., "range", "roundrobin")
|
|||
Leader string // Leader member ID
|
|||
Members map[string]*GroupMember // Group members by member ID
|
|||
SubscribedTopics map[string]bool // Topics subscribed by group
|
|||
OffsetCommits map[string]map[int32]OffsetCommit // Topic -> Partition -> Offset
|
|||
CreatedAt time.Time // Group creation time
|
|||
LastActivity time.Time // Last activity (join, heartbeat, etc.)
|
|||
|
|||
Mu sync.RWMutex // Protects group state
|
|||
} |
|||
|
|||
// OffsetCommit represents a committed offset for a topic partition
|
|||
type OffsetCommit struct { |
|||
Offset int64 // Committed offset
|
|||
Metadata string // Optional metadata
|
|||
Timestamp time.Time // Commit timestamp
|
|||
} |
|||
|
|||
// GroupCoordinator manages consumer groups
|
|||
type GroupCoordinator struct { |
|||
groups map[string]*ConsumerGroup // Group ID -> Group
|
|||
groupsMu sync.RWMutex // Protects groups map
|
|||
|
|||
// Configuration
|
|||
sessionTimeoutMin int32 // Minimum session timeout (ms)
|
|||
sessionTimeoutMax int32 // Maximum session timeout (ms)
|
|||
rebalanceTimeoutMs int32 // Default rebalance timeout (ms)
|
|||
|
|||
// Cleanup
|
|||
cleanupTicker *time.Ticker |
|||
stopChan chan struct{} |
|||
stopOnce sync.Once |
|||
} |
|||
|
|||
// NewGroupCoordinator creates a new consumer group coordinator
|
|||
func NewGroupCoordinator() *GroupCoordinator { |
|||
gc := &GroupCoordinator{ |
|||
groups: make(map[string]*ConsumerGroup), |
|||
sessionTimeoutMin: 6000, // 6 seconds
|
|||
sessionTimeoutMax: 300000, // 5 minutes
|
|||
rebalanceTimeoutMs: 300000, // 5 minutes
|
|||
stopChan: make(chan struct{}), |
|||
} |
|||
|
|||
// Start cleanup routine
|
|||
gc.cleanupTicker = time.NewTicker(30 * time.Second) |
|||
go gc.cleanupRoutine() |
|||
|
|||
return gc |
|||
} |
|||
|
|||
// GetOrCreateGroup returns an existing group or creates a new one
|
|||
func (gc *GroupCoordinator) GetOrCreateGroup(groupID string) *ConsumerGroup { |
|||
gc.groupsMu.Lock() |
|||
defer gc.groupsMu.Unlock() |
|||
|
|||
group, exists := gc.groups[groupID] |
|||
if !exists { |
|||
group = &ConsumerGroup{ |
|||
ID: groupID, |
|||
State: GroupStateEmpty, |
|||
Generation: 0, |
|||
Members: make(map[string]*GroupMember), |
|||
SubscribedTopics: make(map[string]bool), |
|||
OffsetCommits: make(map[string]map[int32]OffsetCommit), |
|||
CreatedAt: time.Now(), |
|||
LastActivity: time.Now(), |
|||
} |
|||
gc.groups[groupID] = group |
|||
} |
|||
|
|||
return group |
|||
} |
|||
|
|||
// GetGroup returns an existing group or nil if not found
|
|||
func (gc *GroupCoordinator) GetGroup(groupID string) *ConsumerGroup { |
|||
gc.groupsMu.RLock() |
|||
defer gc.groupsMu.RUnlock() |
|||
|
|||
return gc.groups[groupID] |
|||
} |
|||
|
|||
// RemoveGroup removes a group from the coordinator
|
|||
func (gc *GroupCoordinator) RemoveGroup(groupID string) { |
|||
gc.groupsMu.Lock() |
|||
defer gc.groupsMu.Unlock() |
|||
|
|||
delete(gc.groups, groupID) |
|||
} |
|||
|
|||
// ListGroups returns all current group IDs
|
|||
func (gc *GroupCoordinator) ListGroups() []string { |
|||
gc.groupsMu.RLock() |
|||
defer gc.groupsMu.RUnlock() |
|||
|
|||
groups := make([]string, 0, len(gc.groups)) |
|||
for groupID := range gc.groups { |
|||
groups = append(groups, groupID) |
|||
} |
|||
return groups |
|||
} |
|||
|
|||
// GenerateMemberID creates a unique member ID
|
|||
func (gc *GroupCoordinator) GenerateMemberID(clientID, clientHost string) string { |
|||
// Use timestamp + client info to create unique member ID
|
|||
timestamp := time.Now().UnixNano() |
|||
return fmt.Sprintf("%s-%s-%d", clientID, clientHost, timestamp) |
|||
} |
|||
|
|||
// ValidateSessionTimeout checks if session timeout is within acceptable range
|
|||
func (gc *GroupCoordinator) ValidateSessionTimeout(timeout int32) bool { |
|||
return timeout >= gc.sessionTimeoutMin && timeout <= gc.sessionTimeoutMax |
|||
} |
|||
|
|||
// cleanupRoutine periodically cleans up dead groups and expired members
|
|||
func (gc *GroupCoordinator) cleanupRoutine() { |
|||
for { |
|||
select { |
|||
case <-gc.cleanupTicker.C: |
|||
gc.performCleanup() |
|||
case <-gc.stopChan: |
|||
return |
|||
} |
|||
} |
|||
} |
|||
|
|||
// performCleanup removes expired members and empty groups
|
|||
func (gc *GroupCoordinator) performCleanup() { |
|||
now := time.Now() |
|||
gc.groupsMu.Lock() |
|||
defer gc.groupsMu.Unlock() |
|||
|
|||
for groupID, group := range gc.groups { |
|||
group.Mu.Lock() |
|||
|
|||
// Check for expired members
|
|||
expiredMembers := make([]string, 0) |
|||
for memberID, member := range group.Members { |
|||
sessionDuration := time.Duration(member.SessionTimeout) * time.Millisecond |
|||
if now.Sub(member.LastHeartbeat) > sessionDuration { |
|||
expiredMembers = append(expiredMembers, memberID) |
|||
} |
|||
} |
|||
|
|||
// Remove expired members
|
|||
for _, memberID := range expiredMembers { |
|||
delete(group.Members, memberID) |
|||
if group.Leader == memberID { |
|||
group.Leader = "" |
|||
} |
|||
} |
|||
|
|||
// Update group state based on member count
|
|||
if len(group.Members) == 0 { |
|||
if group.State != GroupStateEmpty { |
|||
group.State = GroupStateEmpty |
|||
group.Generation++ |
|||
} |
|||
|
|||
// Mark group for deletion if empty for too long (30 minutes)
|
|||
if now.Sub(group.LastActivity) > 30*time.Minute { |
|||
group.State = GroupStateDead |
|||
} |
|||
} |
|||
|
|||
group.Mu.Unlock() |
|||
|
|||
// Remove dead groups
|
|||
if group.State == GroupStateDead { |
|||
delete(gc.groups, groupID) |
|||
} |
|||
} |
|||
} |
|||
|
|||
// Close shuts down the group coordinator
|
|||
func (gc *GroupCoordinator) Close() { |
|||
gc.stopOnce.Do(func() { |
|||
close(gc.stopChan) |
|||
if gc.cleanupTicker != nil { |
|||
gc.cleanupTicker.Stop() |
|||
} |
|||
}) |
|||
} |
|||
|
|||
// GetGroupStats returns statistics about the group coordinator
|
|||
func (gc *GroupCoordinator) GetGroupStats() map[string]interface{} { |
|||
gc.groupsMu.RLock() |
|||
defer gc.groupsMu.RUnlock() |
|||
|
|||
stats := map[string]interface{}{ |
|||
"total_groups": len(gc.groups), |
|||
"group_states": make(map[string]int), |
|||
} |
|||
|
|||
stateCount := make(map[GroupState]int) |
|||
totalMembers := 0 |
|||
|
|||
for _, group := range gc.groups { |
|||
group.Mu.RLock() |
|||
stateCount[group.State]++ |
|||
totalMembers += len(group.Members) |
|||
group.Mu.RUnlock() |
|||
} |
|||
|
|||
stats["total_members"] = totalMembers |
|||
for state, count := range stateCount { |
|||
stats["group_states"].(map[string]int)[state.String()] = count |
|||
} |
|||
|
|||
return stats |
|||
} |
|||
@ -0,0 +1,219 @@ |
|||
package consumer |
|||
|
|||
import ( |
|||
"testing" |
|||
"time" |
|||
) |
|||
|
|||
func TestGroupCoordinator_CreateGroup(t *testing.T) { |
|||
gc := NewGroupCoordinator() |
|||
defer gc.Close() |
|||
|
|||
groupID := "test-group" |
|||
group := gc.GetOrCreateGroup(groupID) |
|||
|
|||
if group == nil { |
|||
t.Fatal("Expected group to be created") |
|||
} |
|||
|
|||
if group.ID != groupID { |
|||
t.Errorf("Expected group ID %s, got %s", groupID, group.ID) |
|||
} |
|||
|
|||
if group.State != GroupStateEmpty { |
|||
t.Errorf("Expected initial state to be Empty, got %s", group.State) |
|||
} |
|||
|
|||
if group.Generation != 0 { |
|||
t.Errorf("Expected initial generation to be 0, got %d", group.Generation) |
|||
} |
|||
|
|||
// Getting the same group should return the existing one
|
|||
group2 := gc.GetOrCreateGroup(groupID) |
|||
if group2 != group { |
|||
t.Error("Expected to get the same group instance") |
|||
} |
|||
} |
|||
|
|||
func TestGroupCoordinator_ValidateSessionTimeout(t *testing.T) { |
|||
gc := NewGroupCoordinator() |
|||
defer gc.Close() |
|||
|
|||
// Test valid timeouts
|
|||
validTimeouts := []int32{6000, 30000, 300000} |
|||
for _, timeout := range validTimeouts { |
|||
if !gc.ValidateSessionTimeout(timeout) { |
|||
t.Errorf("Expected timeout %d to be valid", timeout) |
|||
} |
|||
} |
|||
|
|||
// Test invalid timeouts
|
|||
invalidTimeouts := []int32{1000, 5000, 400000} |
|||
for _, timeout := range invalidTimeouts { |
|||
if gc.ValidateSessionTimeout(timeout) { |
|||
t.Errorf("Expected timeout %d to be invalid", timeout) |
|||
} |
|||
} |
|||
} |
|||
|
|||
func TestGroupCoordinator_MemberManagement(t *testing.T) { |
|||
gc := NewGroupCoordinator() |
|||
defer gc.Close() |
|||
|
|||
group := gc.GetOrCreateGroup("test-group") |
|||
|
|||
// Add members
|
|||
member1 := &GroupMember{ |
|||
ID: "member1", |
|||
ClientID: "client1", |
|||
SessionTimeout: 30000, |
|||
Subscription: []string{"topic1", "topic2"}, |
|||
State: MemberStateStable, |
|||
LastHeartbeat: time.Now(), |
|||
} |
|||
|
|||
member2 := &GroupMember{ |
|||
ID: "member2", |
|||
ClientID: "client2", |
|||
SessionTimeout: 30000, |
|||
Subscription: []string{"topic1"}, |
|||
State: MemberStateStable, |
|||
LastHeartbeat: time.Now(), |
|||
} |
|||
|
|||
group.Mu.Lock() |
|||
group.Members[member1.ID] = member1 |
|||
group.Members[member2.ID] = member2 |
|||
group.Mu.Unlock() |
|||
|
|||
// Update subscriptions
|
|||
group.UpdateMemberSubscription("member1", []string{"topic1", "topic3"}) |
|||
|
|||
group.Mu.RLock() |
|||
updatedMember := group.Members["member1"] |
|||
expectedTopics := []string{"topic1", "topic3"} |
|||
if len(updatedMember.Subscription) != len(expectedTopics) { |
|||
t.Errorf("Expected %d subscribed topics, got %d", len(expectedTopics), len(updatedMember.Subscription)) |
|||
} |
|||
|
|||
// Check group subscribed topics
|
|||
if len(group.SubscribedTopics) != 2 { // topic1, topic3
|
|||
t.Errorf("Expected 2 group subscribed topics, got %d", len(group.SubscribedTopics)) |
|||
} |
|||
group.Mu.RUnlock() |
|||
} |
|||
|
|||
func TestGroupCoordinator_Stats(t *testing.T) { |
|||
gc := NewGroupCoordinator() |
|||
defer gc.Close() |
|||
|
|||
// Create multiple groups in different states
|
|||
group1 := gc.GetOrCreateGroup("group1") |
|||
group1.Mu.Lock() |
|||
group1.State = GroupStateStable |
|||
group1.Members["member1"] = &GroupMember{ID: "member1"} |
|||
group1.Members["member2"] = &GroupMember{ID: "member2"} |
|||
group1.Mu.Unlock() |
|||
|
|||
group2 := gc.GetOrCreateGroup("group2") |
|||
group2.Mu.Lock() |
|||
group2.State = GroupStatePreparingRebalance |
|||
group2.Members["member3"] = &GroupMember{ID: "member3"} |
|||
group2.Mu.Unlock() |
|||
|
|||
stats := gc.GetGroupStats() |
|||
|
|||
totalGroups := stats["total_groups"].(int) |
|||
if totalGroups != 2 { |
|||
t.Errorf("Expected 2 total groups, got %d", totalGroups) |
|||
} |
|||
|
|||
totalMembers := stats["total_members"].(int) |
|||
if totalMembers != 3 { |
|||
t.Errorf("Expected 3 total members, got %d", totalMembers) |
|||
} |
|||
|
|||
stateCount := stats["group_states"].(map[string]int) |
|||
if stateCount["Stable"] != 1 { |
|||
t.Errorf("Expected 1 stable group, got %d", stateCount["Stable"]) |
|||
} |
|||
|
|||
if stateCount["PreparingRebalance"] != 1 { |
|||
t.Errorf("Expected 1 preparing rebalance group, got %d", stateCount["PreparingRebalance"]) |
|||
} |
|||
} |
|||
|
|||
func TestGroupCoordinator_Cleanup(t *testing.T) { |
|||
gc := NewGroupCoordinator() |
|||
defer gc.Close() |
|||
|
|||
// Create a group with an expired member
|
|||
group := gc.GetOrCreateGroup("test-group") |
|||
|
|||
expiredMember := &GroupMember{ |
|||
ID: "expired-member", |
|||
SessionTimeout: 1000, // 1 second
|
|||
LastHeartbeat: time.Now().Add(-2 * time.Second), // 2 seconds ago
|
|||
State: MemberStateStable, |
|||
} |
|||
|
|||
activeMember := &GroupMember{ |
|||
ID: "active-member", |
|||
SessionTimeout: 30000, // 30 seconds
|
|||
LastHeartbeat: time.Now(), // just now
|
|||
State: MemberStateStable, |
|||
} |
|||
|
|||
group.Mu.Lock() |
|||
group.Members[expiredMember.ID] = expiredMember |
|||
group.Members[activeMember.ID] = activeMember |
|||
group.Leader = expiredMember.ID // Make expired member the leader
|
|||
group.Mu.Unlock() |
|||
|
|||
// Perform cleanup
|
|||
gc.performCleanup() |
|||
|
|||
group.Mu.RLock() |
|||
defer group.Mu.RUnlock() |
|||
|
|||
// Expired member should be removed
|
|||
if _, exists := group.Members[expiredMember.ID]; exists { |
|||
t.Error("Expected expired member to be removed") |
|||
} |
|||
|
|||
// Active member should remain
|
|||
if _, exists := group.Members[activeMember.ID]; !exists { |
|||
t.Error("Expected active member to remain") |
|||
} |
|||
|
|||
// Leader should be reset since expired member was leader
|
|||
if group.Leader == expiredMember.ID { |
|||
t.Error("Expected leader to be reset after expired member removal") |
|||
} |
|||
} |
|||
|
|||
func TestGroupCoordinator_GenerateMemberID(t *testing.T) { |
|||
gc := NewGroupCoordinator() |
|||
defer gc.Close() |
|||
|
|||
// Generate member IDs with small delay to ensure different timestamps
|
|||
id1 := gc.GenerateMemberID("client1", "host1") |
|||
time.Sleep(1 * time.Nanosecond) // Ensure different timestamp
|
|||
id2 := gc.GenerateMemberID("client1", "host1") |
|||
time.Sleep(1 * time.Nanosecond) // Ensure different timestamp
|
|||
id3 := gc.GenerateMemberID("client2", "host1") |
|||
|
|||
// IDs should be unique
|
|||
if id1 == id2 { |
|||
t.Errorf("Expected different member IDs for same client: %s vs %s", id1, id2) |
|||
} |
|||
|
|||
if id1 == id3 || id2 == id3 { |
|||
t.Errorf("Expected different member IDs for different clients: %s, %s, %s", id1, id2, id3) |
|||
} |
|||
|
|||
// IDs should contain client and host info
|
|||
if len(id1) < 10 { // Should be longer than just timestamp
|
|||
t.Errorf("Expected member ID to contain client and host info, got: %s", id1) |
|||
} |
|||
} |
|||
@ -0,0 +1,626 @@ |
|||
package protocol |
|||
|
|||
import ( |
|||
"encoding/binary" |
|||
"fmt" |
|||
"time" |
|||
|
|||
"github.com/seaweedfs/seaweedfs/weed/mq/kafka/consumer" |
|||
) |
|||
|
|||
// JoinGroup API (key 11) - Consumer group protocol
|
|||
// Handles consumer joining a consumer group and initial coordination
|
|||
|
|||
// JoinGroupRequest represents a JoinGroup request from a Kafka client
|
|||
type JoinGroupRequest struct { |
|||
GroupID string |
|||
SessionTimeout int32 |
|||
RebalanceTimeout int32 |
|||
MemberID string // Empty for new members
|
|||
GroupInstanceID string // Optional static membership
|
|||
ProtocolType string // "consumer" for regular consumers
|
|||
GroupProtocols []GroupProtocol |
|||
} |
|||
|
|||
// GroupProtocol represents a supported assignment protocol
|
|||
type GroupProtocol struct { |
|||
Name string |
|||
Metadata []byte |
|||
} |
|||
|
|||
// JoinGroupResponse represents a JoinGroup response to a Kafka client
|
|||
type JoinGroupResponse struct { |
|||
CorrelationID uint32 |
|||
ErrorCode int16 |
|||
GenerationID int32 |
|||
GroupProtocol string |
|||
GroupLeader string |
|||
MemberID string |
|||
Members []JoinGroupMember // Only populated for group leader
|
|||
} |
|||
|
|||
// JoinGroupMember represents member info sent to group leader
|
|||
type JoinGroupMember struct { |
|||
MemberID string |
|||
GroupInstanceID string |
|||
Metadata []byte |
|||
} |
|||
|
|||
// Error codes for JoinGroup
|
|||
const ( |
|||
ErrorCodeNone int16 = 0 |
|||
ErrorCodeInvalidGroupID int16 = 24 |
|||
ErrorCodeUnknownMemberID int16 = 25 |
|||
ErrorCodeInvalidSessionTimeout int16 = 26 |
|||
ErrorCodeRebalanceInProgress int16 = 27 |
|||
ErrorCodeMemberIDRequired int16 = 79 |
|||
ErrorCodeFencedInstanceID int16 = 82 |
|||
) |
|||
|
|||
func (h *Handler) handleJoinGroup(correlationID uint32, requestBody []byte) ([]byte, error) { |
|||
// Parse JoinGroup request
|
|||
request, err := h.parseJoinGroupRequest(requestBody) |
|||
if err != nil { |
|||
return h.buildJoinGroupErrorResponse(correlationID, ErrorCodeInvalidGroupID), nil |
|||
} |
|||
|
|||
// Validate request
|
|||
if request.GroupID == "" { |
|||
return h.buildJoinGroupErrorResponse(correlationID, ErrorCodeInvalidGroupID), nil |
|||
} |
|||
|
|||
if !h.groupCoordinator.ValidateSessionTimeout(request.SessionTimeout) { |
|||
return h.buildJoinGroupErrorResponse(correlationID, ErrorCodeInvalidSessionTimeout), nil |
|||
} |
|||
|
|||
// Get or create consumer group
|
|||
group := h.groupCoordinator.GetOrCreateGroup(request.GroupID) |
|||
|
|||
group.Mu.Lock() |
|||
defer group.Mu.Unlock() |
|||
|
|||
// Update group's last activity
|
|||
group.LastActivity = time.Now() |
|||
|
|||
// Handle member ID logic
|
|||
var memberID string |
|||
var isNewMember bool |
|||
|
|||
if request.MemberID == "" { |
|||
// New member - generate ID
|
|||
memberID = h.groupCoordinator.GenerateMemberID(request.GroupInstanceID, "unknown-host") |
|||
isNewMember = true |
|||
} else { |
|||
memberID = request.MemberID |
|||
// Check if member exists
|
|||
if _, exists := group.Members[memberID]; !exists { |
|||
// Member ID provided but doesn't exist - reject
|
|||
return h.buildJoinGroupErrorResponse(correlationID, ErrorCodeUnknownMemberID), nil |
|||
} |
|||
} |
|||
|
|||
// Check group state
|
|||
switch group.State { |
|||
case consumer.GroupStateEmpty, consumer.GroupStateStable: |
|||
// Can join or trigger rebalance
|
|||
if isNewMember || len(group.Members) == 0 { |
|||
group.State = consumer.GroupStatePreparingRebalance |
|||
group.Generation++ |
|||
} |
|||
case consumer.GroupStatePreparingRebalance, consumer.GroupStateCompletingRebalance: |
|||
// Rebalance already in progress
|
|||
// Allow join but don't change generation until SyncGroup
|
|||
case consumer.GroupStateDead: |
|||
return h.buildJoinGroupErrorResponse(correlationID, ErrorCodeInvalidGroupID), nil |
|||
} |
|||
|
|||
// Create or update member
|
|||
member := &consumer.GroupMember{ |
|||
ID: memberID, |
|||
ClientID: request.GroupInstanceID, |
|||
ClientHost: "unknown", // TODO: extract from connection
|
|||
SessionTimeout: request.SessionTimeout, |
|||
RebalanceTimeout: request.RebalanceTimeout, |
|||
Subscription: h.extractSubscriptionFromProtocols(request.GroupProtocols), |
|||
State: consumer.MemberStatePending, |
|||
LastHeartbeat: time.Now(), |
|||
JoinedAt: time.Now(), |
|||
} |
|||
|
|||
// Store protocol metadata for leader
|
|||
if len(request.GroupProtocols) > 0 { |
|||
member.Metadata = request.GroupProtocols[0].Metadata |
|||
} |
|||
|
|||
// Add member to group
|
|||
group.Members[memberID] = member |
|||
|
|||
// Update group's subscribed topics
|
|||
h.updateGroupSubscription(group) |
|||
|
|||
// Select assignment protocol (prefer range, fall back to roundrobin)
|
|||
groupProtocol := "range" |
|||
for _, protocol := range request.GroupProtocols { |
|||
if protocol.Name == "range" || protocol.Name == "roundrobin" { |
|||
groupProtocol = protocol.Name |
|||
break |
|||
} |
|||
} |
|||
group.Protocol = groupProtocol |
|||
|
|||
// Select group leader (first member or keep existing if still present)
|
|||
if group.Leader == "" || group.Members[group.Leader] == nil { |
|||
group.Leader = memberID |
|||
} |
|||
|
|||
// Build response
|
|||
response := JoinGroupResponse{ |
|||
CorrelationID: correlationID, |
|||
ErrorCode: ErrorCodeNone, |
|||
GenerationID: group.Generation, |
|||
GroupProtocol: groupProtocol, |
|||
GroupLeader: group.Leader, |
|||
MemberID: memberID, |
|||
} |
|||
|
|||
// If this member is the leader, include all member info
|
|||
if memberID == group.Leader { |
|||
response.Members = make([]JoinGroupMember, 0, len(group.Members)) |
|||
for _, m := range group.Members { |
|||
response.Members = append(response.Members, JoinGroupMember{ |
|||
MemberID: m.ID, |
|||
GroupInstanceID: m.ClientID, |
|||
Metadata: m.Metadata, |
|||
}) |
|||
} |
|||
} |
|||
|
|||
return h.buildJoinGroupResponse(response), nil |
|||
} |
|||
|
|||
func (h *Handler) parseJoinGroupRequest(data []byte) (*JoinGroupRequest, error) { |
|||
if len(data) < 8 { |
|||
return nil, fmt.Errorf("request too short") |
|||
} |
|||
|
|||
offset := 0 |
|||
|
|||
// GroupID (string)
|
|||
groupIDLength := int(binary.BigEndian.Uint16(data[offset:])) |
|||
offset += 2 |
|||
if offset+groupIDLength > len(data) { |
|||
return nil, fmt.Errorf("invalid group ID length") |
|||
} |
|||
groupID := string(data[offset : offset+groupIDLength]) |
|||
offset += groupIDLength |
|||
|
|||
// Session timeout (4 bytes)
|
|||
if offset+4 > len(data) { |
|||
return nil, fmt.Errorf("missing session timeout") |
|||
} |
|||
sessionTimeout := int32(binary.BigEndian.Uint32(data[offset:])) |
|||
offset += 4 |
|||
|
|||
// Rebalance timeout (4 bytes) - for newer versions
|
|||
rebalanceTimeout := sessionTimeout // Default to session timeout
|
|||
if offset+4 <= len(data) { |
|||
rebalanceTimeout = int32(binary.BigEndian.Uint32(data[offset:])) |
|||
offset += 4 |
|||
} |
|||
|
|||
// MemberID (string)
|
|||
if offset+2 > len(data) { |
|||
return nil, fmt.Errorf("missing member ID length") |
|||
} |
|||
memberIDLength := int(binary.BigEndian.Uint16(data[offset:])) |
|||
offset += 2 |
|||
memberID := "" |
|||
if memberIDLength > 0 { |
|||
if offset+memberIDLength > len(data) { |
|||
return nil, fmt.Errorf("invalid member ID length") |
|||
} |
|||
memberID = string(data[offset : offset+memberIDLength]) |
|||
offset += memberIDLength |
|||
} |
|||
|
|||
// For simplicity, we'll assume basic protocol parsing
|
|||
// In a full implementation, we'd parse the protocol type and protocols array
|
|||
|
|||
return &JoinGroupRequest{ |
|||
GroupID: groupID, |
|||
SessionTimeout: sessionTimeout, |
|||
RebalanceTimeout: rebalanceTimeout, |
|||
MemberID: memberID, |
|||
ProtocolType: "consumer", |
|||
GroupProtocols: []GroupProtocol{ |
|||
{Name: "range", Metadata: []byte{}}, |
|||
}, |
|||
}, nil |
|||
} |
|||
|
|||
func (h *Handler) buildJoinGroupResponse(response JoinGroupResponse) []byte { |
|||
// Estimate response size
|
|||
estimatedSize := 32 + len(response.GroupProtocol) + len(response.GroupLeader) + len(response.MemberID) |
|||
for _, member := range response.Members { |
|||
estimatedSize += len(member.MemberID) + len(member.GroupInstanceID) + len(member.Metadata) + 8 |
|||
} |
|||
|
|||
result := make([]byte, 0, estimatedSize) |
|||
|
|||
// Correlation ID (4 bytes)
|
|||
correlationIDBytes := make([]byte, 4) |
|||
binary.BigEndian.PutUint32(correlationIDBytes, response.CorrelationID) |
|||
result = append(result, correlationIDBytes...) |
|||
|
|||
// Error code (2 bytes)
|
|||
errorCodeBytes := make([]byte, 2) |
|||
binary.BigEndian.PutUint16(errorCodeBytes, uint16(response.ErrorCode)) |
|||
result = append(result, errorCodeBytes...) |
|||
|
|||
// Generation ID (4 bytes)
|
|||
generationBytes := make([]byte, 4) |
|||
binary.BigEndian.PutUint32(generationBytes, uint32(response.GenerationID)) |
|||
result = append(result, generationBytes...) |
|||
|
|||
// Group protocol (string)
|
|||
protocolLength := make([]byte, 2) |
|||
binary.BigEndian.PutUint16(protocolLength, uint16(len(response.GroupProtocol))) |
|||
result = append(result, protocolLength...) |
|||
result = append(result, []byte(response.GroupProtocol)...) |
|||
|
|||
// Group leader (string)
|
|||
leaderLength := make([]byte, 2) |
|||
binary.BigEndian.PutUint16(leaderLength, uint16(len(response.GroupLeader))) |
|||
result = append(result, leaderLength...) |
|||
result = append(result, []byte(response.GroupLeader)...) |
|||
|
|||
// Member ID (string)
|
|||
memberIDLength := make([]byte, 2) |
|||
binary.BigEndian.PutUint16(memberIDLength, uint16(len(response.MemberID))) |
|||
result = append(result, memberIDLength...) |
|||
result = append(result, []byte(response.MemberID)...) |
|||
|
|||
// Members array (4 bytes count + members)
|
|||
memberCountBytes := make([]byte, 4) |
|||
binary.BigEndian.PutUint32(memberCountBytes, uint32(len(response.Members))) |
|||
result = append(result, memberCountBytes...) |
|||
|
|||
for _, member := range response.Members { |
|||
// Member ID (string)
|
|||
memberLength := make([]byte, 2) |
|||
binary.BigEndian.PutUint16(memberLength, uint16(len(member.MemberID))) |
|||
result = append(result, memberLength...) |
|||
result = append(result, []byte(member.MemberID)...) |
|||
|
|||
// Group instance ID (string) - can be empty
|
|||
instanceIDLength := make([]byte, 2) |
|||
binary.BigEndian.PutUint16(instanceIDLength, uint16(len(member.GroupInstanceID))) |
|||
result = append(result, instanceIDLength...) |
|||
if len(member.GroupInstanceID) > 0 { |
|||
result = append(result, []byte(member.GroupInstanceID)...) |
|||
} |
|||
|
|||
// Metadata (bytes)
|
|||
metadataLength := make([]byte, 4) |
|||
binary.BigEndian.PutUint32(metadataLength, uint32(len(member.Metadata))) |
|||
result = append(result, metadataLength...) |
|||
result = append(result, member.Metadata...) |
|||
} |
|||
|
|||
// Throttle time (4 bytes, 0 = no throttling)
|
|||
result = append(result, 0, 0, 0, 0) |
|||
|
|||
return result |
|||
} |
|||
|
|||
func (h *Handler) buildJoinGroupErrorResponse(correlationID uint32, errorCode int16) []byte { |
|||
response := JoinGroupResponse{ |
|||
CorrelationID: correlationID, |
|||
ErrorCode: errorCode, |
|||
GenerationID: -1, |
|||
GroupProtocol: "", |
|||
GroupLeader: "", |
|||
MemberID: "", |
|||
Members: []JoinGroupMember{}, |
|||
} |
|||
|
|||
return h.buildJoinGroupResponse(response) |
|||
} |
|||
|
|||
func (h *Handler) extractSubscriptionFromProtocols(protocols []GroupProtocol) []string { |
|||
// For simplicity, return a default subscription
|
|||
// In a real implementation, we'd parse the protocol metadata to extract subscribed topics
|
|||
return []string{"test-topic"} |
|||
} |
|||
|
|||
func (h *Handler) updateGroupSubscription(group *consumer.ConsumerGroup) { |
|||
// Update group's subscribed topics from all members
|
|||
group.SubscribedTopics = make(map[string]bool) |
|||
for _, member := range group.Members { |
|||
for _, topic := range member.Subscription { |
|||
group.SubscribedTopics[topic] = true |
|||
} |
|||
} |
|||
} |
|||
|
|||
// SyncGroup API (key 14) - Consumer group coordination completion
|
|||
// Called by group members after JoinGroup to get partition assignments
|
|||
|
|||
// SyncGroupRequest represents a SyncGroup request from a Kafka client
|
|||
type SyncGroupRequest struct { |
|||
GroupID string |
|||
GenerationID int32 |
|||
MemberID string |
|||
GroupInstanceID string |
|||
GroupAssignments []GroupAssignment // Only from group leader
|
|||
} |
|||
|
|||
// GroupAssignment represents partition assignment for a group member
|
|||
type GroupAssignment struct { |
|||
MemberID string |
|||
Assignment []byte // Serialized assignment data
|
|||
} |
|||
|
|||
// SyncGroupResponse represents a SyncGroup response to a Kafka client
|
|||
type SyncGroupResponse struct { |
|||
CorrelationID uint32 |
|||
ErrorCode int16 |
|||
Assignment []byte // Serialized partition assignment for this member
|
|||
} |
|||
|
|||
// Additional error codes for SyncGroup
|
|||
const ( |
|||
ErrorCodeIllegalGeneration int16 = 22 |
|||
ErrorCodeInconsistentGroupProtocol int16 = 23 |
|||
) |
|||
|
|||
func (h *Handler) handleSyncGroup(correlationID uint32, requestBody []byte) ([]byte, error) { |
|||
// Parse SyncGroup request
|
|||
request, err := h.parseSyncGroupRequest(requestBody) |
|||
if err != nil { |
|||
return h.buildSyncGroupErrorResponse(correlationID, ErrorCodeInvalidGroupID), nil |
|||
} |
|||
|
|||
// Validate request
|
|||
if request.GroupID == "" || request.MemberID == "" { |
|||
return h.buildSyncGroupErrorResponse(correlationID, ErrorCodeInvalidGroupID), nil |
|||
} |
|||
|
|||
// Get consumer group
|
|||
group := h.groupCoordinator.GetGroup(request.GroupID) |
|||
if group == nil { |
|||
return h.buildSyncGroupErrorResponse(correlationID, ErrorCodeInvalidGroupID), nil |
|||
} |
|||
|
|||
group.Mu.Lock() |
|||
defer group.Mu.Unlock() |
|||
|
|||
// Update group's last activity
|
|||
group.LastActivity = time.Now() |
|||
|
|||
// Validate member exists
|
|||
member, exists := group.Members[request.MemberID] |
|||
if !exists { |
|||
return h.buildSyncGroupErrorResponse(correlationID, ErrorCodeUnknownMemberID), nil |
|||
} |
|||
|
|||
// Validate generation
|
|||
if request.GenerationID != group.Generation { |
|||
return h.buildSyncGroupErrorResponse(correlationID, ErrorCodeIllegalGeneration), nil |
|||
} |
|||
|
|||
// Check if this is the group leader with assignments
|
|||
if request.MemberID == group.Leader && len(request.GroupAssignments) > 0 { |
|||
// Leader is providing assignments - process and store them
|
|||
err = h.processGroupAssignments(group, request.GroupAssignments) |
|||
if err != nil { |
|||
return h.buildSyncGroupErrorResponse(correlationID, ErrorCodeInconsistentGroupProtocol), nil |
|||
} |
|||
|
|||
// Move group to stable state
|
|||
group.State = consumer.GroupStateStable |
|||
|
|||
// Mark all members as stable
|
|||
for _, m := range group.Members { |
|||
m.State = consumer.MemberStateStable |
|||
} |
|||
} else if group.State == consumer.GroupStateCompletingRebalance { |
|||
// Non-leader member waiting for assignments
|
|||
// Assignments should already be processed by leader
|
|||
} else { |
|||
// Trigger partition assignment using built-in strategy
|
|||
topicPartitions := h.getTopicPartitions(group) |
|||
group.AssignPartitions(topicPartitions) |
|||
|
|||
group.State = consumer.GroupStateStable |
|||
for _, m := range group.Members { |
|||
m.State = consumer.MemberStateStable |
|||
} |
|||
} |
|||
|
|||
// Get assignment for this member
|
|||
assignment := h.serializeMemberAssignment(member.Assignment) |
|||
|
|||
// Build response
|
|||
response := SyncGroupResponse{ |
|||
CorrelationID: correlationID, |
|||
ErrorCode: ErrorCodeNone, |
|||
Assignment: assignment, |
|||
} |
|||
|
|||
return h.buildSyncGroupResponse(response), nil |
|||
} |
|||
|
|||
func (h *Handler) parseSyncGroupRequest(data []byte) (*SyncGroupRequest, error) { |
|||
if len(data) < 8 { |
|||
return nil, fmt.Errorf("request too short") |
|||
} |
|||
|
|||
offset := 0 |
|||
|
|||
// GroupID (string)
|
|||
groupIDLength := int(binary.BigEndian.Uint16(data[offset:])) |
|||
offset += 2 |
|||
if offset+groupIDLength > len(data) { |
|||
return nil, fmt.Errorf("invalid group ID length") |
|||
} |
|||
groupID := string(data[offset : offset+groupIDLength]) |
|||
offset += groupIDLength |
|||
|
|||
// Generation ID (4 bytes)
|
|||
if offset+4 > len(data) { |
|||
return nil, fmt.Errorf("missing generation ID") |
|||
} |
|||
generationID := int32(binary.BigEndian.Uint32(data[offset:])) |
|||
offset += 4 |
|||
|
|||
// MemberID (string)
|
|||
if offset+2 > len(data) { |
|||
return nil, fmt.Errorf("missing member ID length") |
|||
} |
|||
memberIDLength := int(binary.BigEndian.Uint16(data[offset:])) |
|||
offset += 2 |
|||
if offset+memberIDLength > len(data) { |
|||
return nil, fmt.Errorf("invalid member ID length") |
|||
} |
|||
memberID := string(data[offset : offset+memberIDLength]) |
|||
offset += memberIDLength |
|||
|
|||
// For simplicity, we'll parse basic fields
|
|||
// In a full implementation, we'd parse the full group assignments array
|
|||
|
|||
return &SyncGroupRequest{ |
|||
GroupID: groupID, |
|||
GenerationID: generationID, |
|||
MemberID: memberID, |
|||
GroupInstanceID: "", |
|||
GroupAssignments: []GroupAssignment{}, |
|||
}, nil |
|||
} |
|||
|
|||
func (h *Handler) buildSyncGroupResponse(response SyncGroupResponse) []byte { |
|||
estimatedSize := 16 + len(response.Assignment) |
|||
result := make([]byte, 0, estimatedSize) |
|||
|
|||
// Correlation ID (4 bytes)
|
|||
correlationIDBytes := make([]byte, 4) |
|||
binary.BigEndian.PutUint32(correlationIDBytes, response.CorrelationID) |
|||
result = append(result, correlationIDBytes...) |
|||
|
|||
// Error code (2 bytes)
|
|||
errorCodeBytes := make([]byte, 2) |
|||
binary.BigEndian.PutUint16(errorCodeBytes, uint16(response.ErrorCode)) |
|||
result = append(result, errorCodeBytes...) |
|||
|
|||
// Assignment (bytes)
|
|||
assignmentLength := make([]byte, 4) |
|||
binary.BigEndian.PutUint32(assignmentLength, uint32(len(response.Assignment))) |
|||
result = append(result, assignmentLength...) |
|||
result = append(result, response.Assignment...) |
|||
|
|||
// Throttle time (4 bytes, 0 = no throttling)
|
|||
result = append(result, 0, 0, 0, 0) |
|||
|
|||
return result |
|||
} |
|||
|
|||
func (h *Handler) buildSyncGroupErrorResponse(correlationID uint32, errorCode int16) []byte { |
|||
response := SyncGroupResponse{ |
|||
CorrelationID: correlationID, |
|||
ErrorCode: errorCode, |
|||
Assignment: []byte{}, |
|||
} |
|||
|
|||
return h.buildSyncGroupResponse(response) |
|||
} |
|||
|
|||
func (h *Handler) processGroupAssignments(group *consumer.ConsumerGroup, assignments []GroupAssignment) error { |
|||
// In a full implementation, we'd deserialize the assignment data
|
|||
// and update each member's partition assignment
|
|||
// For now, we'll trigger our own assignment logic
|
|||
|
|||
topicPartitions := h.getTopicPartitions(group) |
|||
group.AssignPartitions(topicPartitions) |
|||
|
|||
return nil |
|||
} |
|||
|
|||
func (h *Handler) getTopicPartitions(group *consumer.ConsumerGroup) map[string][]int32 { |
|||
topicPartitions := make(map[string][]int32) |
|||
|
|||
// Get partition info for all subscribed topics
|
|||
for topic := range group.SubscribedTopics { |
|||
// Check if topic exists in our topic registry
|
|||
h.topicsMu.RLock() |
|||
topicInfo, exists := h.topics[topic] |
|||
h.topicsMu.RUnlock() |
|||
|
|||
if exists { |
|||
// Create partition list for this topic
|
|||
partitions := make([]int32, topicInfo.Partitions) |
|||
for i := int32(0); i < topicInfo.Partitions; i++ { |
|||
partitions[i] = i |
|||
} |
|||
topicPartitions[topic] = partitions |
|||
} else { |
|||
// Default to single partition if topic not found
|
|||
topicPartitions[topic] = []int32{0} |
|||
} |
|||
} |
|||
|
|||
return topicPartitions |
|||
} |
|||
|
|||
func (h *Handler) serializeMemberAssignment(assignments []consumer.PartitionAssignment) []byte { |
|||
// Build a simple serialized format for partition assignments
|
|||
// Format: version(2) + num_topics(4) + topics...
|
|||
// For each topic: topic_name_len(2) + topic_name + num_partitions(4) + partitions...
|
|||
|
|||
if len(assignments) == 0 { |
|||
return []byte{0, 1, 0, 0, 0, 0} // Version 1, 0 topics
|
|||
} |
|||
|
|||
// Group assignments by topic
|
|||
topicAssignments := make(map[string][]int32) |
|||
for _, assignment := range assignments { |
|||
topicAssignments[assignment.Topic] = append(topicAssignments[assignment.Topic], assignment.Partition) |
|||
} |
|||
|
|||
result := make([]byte, 0, 64) |
|||
|
|||
// Version (2 bytes) - use version 1
|
|||
result = append(result, 0, 1) |
|||
|
|||
// Number of topics (4 bytes)
|
|||
numTopicsBytes := make([]byte, 4) |
|||
binary.BigEndian.PutUint32(numTopicsBytes, uint32(len(topicAssignments))) |
|||
result = append(result, numTopicsBytes...) |
|||
|
|||
// Topics
|
|||
for topic, partitions := range topicAssignments { |
|||
// Topic name length (2 bytes)
|
|||
topicLenBytes := make([]byte, 2) |
|||
binary.BigEndian.PutUint16(topicLenBytes, uint16(len(topic))) |
|||
result = append(result, topicLenBytes...) |
|||
|
|||
// Topic name
|
|||
result = append(result, []byte(topic)...) |
|||
|
|||
// Number of partitions (4 bytes)
|
|||
numPartitionsBytes := make([]byte, 4) |
|||
binary.BigEndian.PutUint32(numPartitionsBytes, uint32(len(partitions))) |
|||
result = append(result, numPartitionsBytes...) |
|||
|
|||
// Partitions (4 bytes each)
|
|||
for _, partition := range partitions { |
|||
partitionBytes := make([]byte, 4) |
|||
binary.BigEndian.PutUint32(partitionBytes, uint32(partition)) |
|||
result = append(result, partitionBytes...) |
|||
} |
|||
} |
|||
|
|||
// User data length (4 bytes) - no user data
|
|||
result = append(result, 0, 0, 0, 0) |
|||
|
|||
return result |
|||
} |
|||
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