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### Branch: `qcloudOnly`
## Zipkin日志收集 Trace原理
### Yoho.trace组件图
![YohoTrace原理图] (../img_readme/YohoTraceComponent.png)
### Trace-span在服务之间的生命周期图
![TraceSpan声明周期图] (../img_readme/TraceSpanLifeCycle.png)
### Trace-span 父子关系图
![TraceSpan父子关系图] (../img_readme/TraceSpanMenbership.png)
### yoho.trace的实现机制图
![YohoTrace实现机制图] (../img_readme/YohoTraceRealizationMechanism.png)
- Restful request被服务1的mvc interceptor 拦截,从request中提取相关信息,通过tracer manager完成span的构造;
- 当服务1需要通过restful访问服务2时,被httprequest interceptor拦截,通过tracer manage完成span的构造,添加Restful request请求中。
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