[GitHub] langyan1022 opened a new issue #2134: Hystrix Or agent core bug

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langyan1022 opened a new issue #2134: Hystrix  Or agent core  bug
URL: https://github.com/apache/incubator-skywalking/issues/2134
 
 
   Please answer these questions before submitting your issue.
   
   - Why do you submit this issue?
   - [X] Question or discussion
   - [X] Bug
   - [ ] Requirement
   - [ ] Feature or performance improvement
   
   
   ___
   ### Bug
   - Which version of SkyWalking, OS and JRE?
   Skywalking:6.0.0GA-Snapshot
   OS:linux
   JRE:agent 1.6  server 1.8
   
   - What happen?
   **Environment Description:** System A accesses B system through Hystrix and Okhttp.
   When I turn off the hystrix function. A application can be connected in series with B application tracking. However, after opening hystrix, the A application cannot be connected in series with the B application, and only the related information of the A system can be traced.
   I tried to track the code and the log and found that the spanId in the ContextCarrier became 1 after hystrix.
   
   And found that there is such a piece of code in the capture method of TracingContext
   ```
   ContextSnapshot snapshot = new ContextSnapshot(segment.getTraceSegmentId(),
               this.activeSpan().getSpanId(),
               segment.getRelatedGlobalTraces());
   ```
    this.activeSpan().getSpanId() return 0 each time in the hystrix plugin.
   But spanIdGenerator is indeed a value that looks correct
   
   I added a code like this, which I can see from the log.
   ```
    logger.debug("activeSpanId:{};spanIdGenerator:{}",this.activeSpan().getSpanId(),spanIdGenerator);
   ```
   ___
   ### Requirement or improvement
   

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