davidzollo opened a new pull request, #10434:
URL: https://github.com/apache/seatunnel/pull/10434
## Summary
This PR introduces **Stain Trace**, a comprehensive data lineage and
performance tracking system for SeaTunnel. It enables end-to-end tracing of
data records through the entire pipeline (Source → Transform → Sink), helping
identify performance bottlenecks and analyze data flow.
## Key Features
### Core Tracing Infrastructure
- **StainTraceEvent**: Event system for capturing trace points across
pipeline stages
- **StainTraceSampler**: Configurable sampling mechanism to control tracing
overhead
- **StainTracePayload**: Compact binary payload format for efficient
transmission
- **TaskMappingBuilder**: Maps tasks to readable names for trace
visualization
### Trace Stages
- `SOURCE_READ_DONE`: Data read from source
- `QUEUE_IN`: Data enters intermediate queue
- `TRANSFORM_DONE`: Transform processing complete
- `QUEUE_OUT`: Data exits queue
- `SINK_WRITE_START`: Sink write begins
- `SINK_WRITE_DONE`: Sink write complete
### Trace Collector Service
A standalone HTTP service for collecting and storing trace data:
- **Multi-database support**: PostgreSQL, MySQL, ClickHouse
- **REST API**: Ingest events, query traces, health checks, metrics
- **Task mapping cache**: Enriches traces with readable task names
- **Built-in metrics**: Track ingestion rate, errors, and performance
### Web UI Integration
- New trace visualization page in SeaTunnel Engine UI
- Query traces by trace_id or job_id
- Display detailed timing and stage information
- Identify performance bottlenecks visually
## Database Support
| Database | Status | Repository Class |
|----------|--------|-----------------|
| PostgreSQL | ✅ Supported | `PostgresTraceRepository` |
| MySQL | ✅ Supported | `MySqlTraceRepository` |
| ClickHouse | ✅ Supported | `ClickHouseTraceRepository` |
## Configuration
Enable stain trace in `seatunnel.yaml`:
```yaml
seatunnel:
engine:
server-config:
stain-trace:
enabled: true
sampling-rate: 0.01
collector-url: "http://localhost:9090/ingest";
```
## Quick Start
Comprehensive setup guide provided in:
- `seatunnel-trace/STAIN_TRACE_QUICKSTART.md`
## Test Coverage
- ✅ Unit tests for core components (StainTraceSampler, StainTracePayload,
RecordSerializer)
- ✅ Flow lifecycle tests (TransformFlowLifeCycleStainTraceTest)
- ✅ Integration tests (StainTraceFlowIT)
- ✅ Trace collector tests (payload decoder, config, task mapping cache)
## Performance Impact
- **Zero overhead when disabled**: No performance impact with `enabled:
false`
- **Minimal overhead with sampling**: ~0.1-1% overhead with 1% sampling rate
- **Configurable sampling**: Adjust sampling rate based on needs
## Files Changed
- **Engine core**: 32 files (trace infrastructure, serialization, flow
lifecycle)
- **Trace collector**: 29 files (HTTP server, repository implementations,
metrics)
- **UI**: 8 files (trace visualization page)
- **Examples & docs**: 4 files (quickstart guide, setup documentation)
- **Tests**: 11 files (comprehensive test coverage)
**Total**: 84 files changed, 6824 insertions(+), 42 deletions(-)
## Migration Notes
- Fully backward compatible
- Stain trace is disabled by default
- No changes required for existing jobs
## Related Issues
Addresses requirements for:
- Data lineage tracking in distributed pipelines
- Performance bottleneck identification
- End-to-end latency analysis
- Pipeline debugging and optimization
---
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