stankiewicz opened a new pull request, #39151:
URL: https://github.com/apache/beam/pull/39151
This PR introduces OpenTelemetry (OTel) support for Kafka IO, enabling
distributed tracing and better observability for Kafka message consumption and
production within Apache Beam pipelines.
- Configuration: Added withEnableOpenTelemetryTracing() configuration
methods to KafkaIO.Read, KafkaIO.Write, and KafkaIO.WriteRecords builders to
allow users to easily toggle OTel tracing.
- Context Propagation (Write): Introduced the OpenTelemetryHeaderPropagator
DoFn. When OTel tracing is enabled, this function injects the current
OpenTelemetry trace context into outbound ProducerRecord headers via the W3C
Trace Context propagator, ensuring traces continue downstream.
- Context Extraction (Read): Introduced the OpenTelemetryHeaderConsumer
DoFn. When OTel tracing is enabled, this function extracts the trace context
from incoming Kafka Record headers and sets it as the active context during
record processing, successfully linking distributed traces from upstream
publishers.
- Pipeline Options Integration: The OTel tracer is initialized in the @Setup
lifecycle methods of the new DoFns by extracting the OpenTelemetry instance
directly from PipelineOptions via SdkHarnessOptions.
- Compatibility: Added OTEL_TRACING to
KafkaIOReadImplementationCompatibility to track feature support across
different implementations.
------------------------
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