reporter-xray-udp

AWS X-Ray Reporter for Zipkin

Used in an application that is being traced, this component converts Zipkin trace data (spans) into AWS X-Ray's proprietary format and sends them to the X-Ray daemon using UDP.

Architecture

No Zipkin server is required to use this component with X-Ray. The purpose of the library is to allow applications that trace using Brave's Tracer API and B3 propagation to forward recorded telemetry to X-Ray from the traced applications.

Concurrency

Note that, unlike AsyncReporter, this reporter attempts to encode and send the span immediately on the calling thread. As UDP is used, there is no time spent waiting for a response. However, this is still a blocking I/O operation, so extra concurrency considerations may be required if using this reporter in an asynchronous framework that expects I/O operations not to block.

Configuration

To use the X-Ray Reporter, you'll need to:

1. Include the dependency in your application

The coordinates of the dependency to include are:

io.zipkin.aws:zipkin-reporter-xray-udp:<VERSION>

Note that this also brings in the required zipkin-storage-xray-udp dependency.

2. Create a Tracing instance that uses the Reporter

For example, if you're tracing in a Spring application, you can configure the Tracing bean as such:

    @Bean
    fun tracing(@Value("\${spring.application.name:spring-tracing}") serviceName: String, 
                spanReporter: Reporter<Span>): Tracing {
        return Tracing.newBuilder()
            .localServiceName(serviceName)
            .spanReporter(XRayUDPReporter.create())
            .traceId128Bit(true) // X-Ray requires 128-bit trace IDs
            .sampler(Sampler.ALWAYS_SAMPLE) // Configure as desired
            .build()
    }

3. Ensure the X-Ray daemon is running alongside your application

The Reporter doesn't send tracing data directly to the X-Ray product, but to an X-Ray daemon accessible locally via UDP. You'll need to ensure your application has access to a running X-Ray daemon for tracing data to reach X-Ray. AWS provides documentation for coniguring the X-Ray daemon in various environments. Don't forget to give the infrastructure hosting your X-Ray daemon permission to upload traces to X-Ray in IAM.

Configuring the X-Ray Daemon address

The default address used to send to the daemon is localhost:2000.

If you need to override the default address, either:

1. set the environment variable AWS_XRAY_DAEMON_ADDRESS; or
2. pass the address as a string to XRayUDPReporter.create().

AWS Propagation

If you are using components of AWS that natively send tracing to X-Ray (as opposed to only tracing with Zipkin throughout the stack), you will want to consider switching to AWS Trace Propagation.