How to start trace with custom trace-id and parent-id?

[iNviNho]

Library Name

micronaut

Library Version(s)

dd-trace:1.50.1

Describe the feature you'd like

Hi,

We are storing outbox events for Kafka in the database with current span context headers:

headers={
x-datadog-parent-id=1425649086485655485,
x-datadog-sampling-priority=1,
tracestate=dd=s:1;
o:rum;
p:13c8ec4a6e566fbd,
x-datadog-origin=rum,
traceparent=00-000000000000000024fefac4c68ae928-13c8ec4a6e566fbd-01,
x-datadog-trace-id=2665843752501438760
}

and when these outbox events are picked (by a different container), we want to trace that operation but attach those spans to an already existing trace so that we can have support for:

• distributed tracing
• distributed logs

Is your feature request related to a problem?

No response

Describe alternatives you've considered

This is what we tried

  void publishFromOutbox(final Outbox outboxEvent) {
    final var tracer = GlobalTracer.get();
    final Span span = tracer.buildSpan(JOBS)
      .withTag(DDTags.RESOURCE_NAME, OUTBOX_SCHEDULER_PUBLISH)
      .ignoreActiveSpan()
      .asChildOf(new CustomSpanContext(
        outboxEvent.headers().get(X_DATADOG_TRACE_ID), outboxEvent.headers().get(X_DATADOG_PARENT_ID)))
      .start();
    tracer.activateSpan(span);
    publish(outboxEvent);
    tracer.activeSpan().finish();
  }

but we can see this doesn't work. Trace is not created or attached to any existing trace.

How can we accomplish starting trace with custom trace-id and parent-id? For PHP services we are using this handy method that you provide

    /**
     * Apply the distributed tracing information on the current and future spans. That API can be called if there is no
     * other currently active span.
     *
     * The distributed tracing context can be reset by calling 'set_distributed_tracing_context("0", "0")'
     *
     * @param string $traceId The unique integer (128-bit unsigned) ID of the trace containing this span
     * @param string $parentId The span integer ID of the parent span
     * @param string|null $origin The distributed tracing origin
     * @param array|string|null $propagated_tags If provided, propagated tags from the root span will be cleared and
     * replaced by the given tags and applied to existing spans
     * @return bool 'true' if the distributed tracing context was properly set, else 'false' if an error occurred
     */
    function set_distributed_tracing_context(
        string $traceId,
        string $parentId,
        ?string $origin = null,
        array|string|null $propagated_tags = null
    ): bool {}

Additional context

No response

[mhlidd]

👋 One option you can try is do a tracer.extract on your Kafka headers and use that extracted context as the parent of your span like you demonstrated. That should create a span with your traceId and parentId.