SpanID, TraceId and ParentSpanId in distributed tracing

[jarvisMicroservice]

Hello,

I am using your greeter service template and have tracing enabled. The system has two services g-1 and g-2.

Client calls g-1; g-1 one calls g-2 before a response is sent back to client.

When I look at logs:

1. Greeter 1 has
app=g-1 parentSpanId=0000000000000000 sampled=true spanId=34a61a1564b1d277 traceId=34a61a1564b1d277

2. Greeter 2 has
   app=g-2 parentSpanId=70491c8cb3744e72 sampled=true spanId=2b64bab7ba9079d6 traceId=34a61a1564b1d277
    
    
    Questions:
    
    1) Why is parentSpandId == 00000 instead of valid value in log 1? Am I supposed to send some metadata from the client to have it set?
    
    2) is there a way we can make spanId != traceId for first span? (see log 1 where span and trace have same value)
    
    3) Why is parentspanID of g2 is not equal to spanId of g-1 ?
    
    
    
    g-1 is calling g-2 using this code
    
    
     ```
   wrapper := w.deps.GRPCClientBuilder.Build()
   // Make client and call method
   conn, _ := wrapper.Dial(ctx, "localhost:8080", grpc.WithTransportCredentials(insecure.NewCredentials()))
   c := helloworld.NewGreeterClient(conn)
   c.SayHello(ctx, &helloworld.HelloRequest{Name: "g-2 hello"})

[talgendler]

You can read more about it here: https://www.jaegertracing.io/docs/1.38/architecture/