[GitHub] [skywalking] Karlzzb opened a new issue #3738: how to link multispans to the same traceId

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Karlzzb opened a new issue #3738: how to link multispans to the same traceId
URL: https://github.com/apache/skywalking/issues/3738
 
 
   Please answer these questions before submitting your issue.
   
   - Why do you submit this issue?
   - [ ] Question or discussion
   - [*] Bug
   - [ ] Requirement
   - [ ] Feature or performance improvement
   
   ___
   ### Question
   - What do you want to know?
   I need to know how to link two spans. 
   ___
   ### Bug
   - Which version of SkyWalking, OS and JRE?
   6.4.0
   - Which company or project?
   zcsmart
   The inner framework in our company. https://github.com/karl-free-legion/zcs-legion-cluster.git
   - What happen?
   If possible, provide a way for reproducing the error. e.g. demo application, component version.
   
   I need to know how to link two spans. I try two methods, neither of which is working.
   
   First : I tried the way attach in my message, codes as below
   
   `        CarrierItem next = contextCarrier.items();
           while (next.hasNext()) {
               next = next.next();
               String contextValue = header.getContextCarrierOrDefault(next.getHeadKey(),"");
               if (!StringUtil.isEmpty(contextValue)) {
                   System.out.println("receive message ["+header.getTrackId()+"] contextCarrier got key="+next.getHeadKey()+",value="+contextValue);
                   next.setHeadValue(contextValue);
               }
           }`
   
   Second: I also use the traceId setting way, such as
   `        List<DistributedTraceId> distributedTraceIds = new ArrayList();
           distributedTraceIds.add(new PropagatedTraceId(header.getTrackId()));
           contextCarrier.setDistributedTraceIds(distributedTraceIds);
           AbstractSpan span = ContextManager.createEntrySpan(header.getTag(), contextCarrier);
   //        span.setPeer(header.getModuleSource().getGroupId());
           new StringTag(Constans.CARRIER_LEGION_TRACK_ID_KEY).set(span,header.getTrackId());
           span.setOperationName("handler Message【"+header.getTrackId()+"】");
           Tags.URL.set(span,header.getUri());
           SpanLayer.asRPCFramework(span);
           span.setComponent(ComponentsDefine.GRPC);`
   
   **The result is** 
   端点:sent out Message【65.96.15723518143630001】
   traceId: 65.96.15723518143630001
   跨度类型:Exit
   组件:
   Peer:g001
   失败:false
   url:M://g001
   legion_track_id:65.96.15723518143630001
   
   跨度信息
   标记.
   端点:handler Message【65.96.15723518143630001】
   traceId: 64.91.15723518147410001
   跨度类型:Entry
   组件:GRPC
   Peer:No Peer
   失败:false
   legion_track_id:65.96.15723518143630001
   url:M://g001
   
   ___
   ### Requirement or improvement
   - Please describe about your requirements or improvement suggestions.

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