stankiewicz opened a new pull request, #39150:
URL: https://github.com/apache/beam/pull/39150
This PR introduces OpenTelemetry (OTel) support for Google Cloud Pub/Sub IO,
enabling distributed tracing and better observability for Pub/Sub operations
within Apache Beam pipelines.
- Configuration: Added withEnableOpenTelemetryTracing() configuration
methods to both PubsubIO.Read and PubsubIO.Write builders to allow users to
toggle OTel tracing.
- Context Propagation (Write): Introduced the OpenTelemetryHeaderPropagator
DoFn. When OTel is enabled, this function injects the current OpenTelemetry
trace context into outbound PubsubMessage attributes (using the googclient_
prefix) via the W3C Trace Context propagator.
- Context Extraction (Read): Introduced the OpenTelemetryHeaderConsumer
DoFn. When OTel is enabled, this function extracts the trace context from
incoming PubsubMessage attributes and sets it as the parent span context for
the "Process Element" span, linking the distributed trace.
- Validation Fix: Updated the validation logic in PubsubIO.Read.expand() to
properly throw an IllegalArgumentException if both a dead letter topic and a
custom bad record router are configured.
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