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Tracer interface creates
Spans and understands how to
Inject (serialize) and
Extract (deserialize) their metadata across process boundaries. It has the following capabilities:
- Start a new
SpanContextinto a carrier
SpanContextfrom a carrier
Each of these will be discussed in more detail below.
Setting up a Tracer
Starting a new Trace
Accessing the Active Span
Propagating a Trace with Inject/Extract
In order to trace across process boundaries in distributed systems, services need to be able to continue the trace injected by the client that sent each request. OpenTracing allows this to happen by providing inject and extract methods that encode a span’s context into a carrier.
inject method allows for the
SpanContext to be passed on to a carrier. The
extract method does the exact opposite. It extracts the
SpanContext from the carrier.