dapper&opentracing

[yzfshuijing]

I have a question, zipkin is based on dapper, and cs,cr,ss,sr have the same spanid. But in opentracing, cs,cr and ss,sr do not have the same span id ,and they have a child of relationship. Is that may have some influence？
Looking forward for your answer！

[codefromthecrypt]

opentracing does not define how to represent remote operations, so what you are mentioning is how some choose to do it (or perhaps example code), right? zipkin predates OT by a while, and its data model was written for RPCs sharing span for client and server. That said, you'll notice zipkin-go-opentracing has a flag on how to handle remote spans (ex shared span or not). Regardless, there's still work needed to support a single-host model, and the primary driver for this work is OT which while doesn't explicitly require single-host spans, in practice, many assume it. openzipkin/zipkin#1480

[yzfshuijing]

thanks for your answer, in brave-opentracing,
public final Span joinSpan(TraceContext context) , public Span newTrace(SamplingFlags samplingFlags)
the above two functions
so in remote operations, if i want to use the same span, i can just use joinSpan, if not just use newTrace.
is that right?

[codefromthecrypt]

actually, you'd want to use newChild as newTrace should only be used when an existing trace can't be read (as it restarts a trace) cc @reta

[yzfshuijing]

oh i see, thanks so much