Intermediate LevelREST APIs & Web Services
How does Distributed Tracing work using W3C Trace Context (traceparent) headers?
❓ Interview Prompt: Explain Distributed Tracing, OpenTelemetry, W3C Trace Context specification (`traceparent: 00-4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-01`), Trace ID, and Span ID.
Distributed Tracing tracks an API request's complete execution lifecycle across microservice boundaries:
W3C Trace Context Standard ('traceparent' header):
Passed in HTTP request headers across internal service calls: 'traceparent: version-trace_id-parent_span_id-trace_flags'.
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Trace ID ('4bf92f35...'): Global unique ID representing the entire end-to-end user request.
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Span ID ('00f067aa...'): Identifies execution of the current individual microservice step.
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OpenTelemetry collectors aggregate these spans to render full flamegraph request latency charts in Jaeger, Zipkin, or Datadog!
Code Implementation Example
http
GET /api/v1/orders HTTP/1.1
Host: order-service.internal
traceparent: 00-4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-01
tracestate: rojo=123,concho=456💡HTTP request carrying W3C traceparent distributed tracing header.
🎯 Interview Key Takeaway
Use W3C traceparent headers to propagate Trace IDs across microservices for end-to-end OpenTelemetry distributed tracing.
#Distributed Tracing#OpenTelemetry#W3C Trace Context#Intermediate
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