如何使用opentelemetry java sdk创建多个服务？

Question

我有一个应用程序是由多个服务组成的专有语言。我想收集痕迹和摄取到Jaeger或APM解决方案。没有插装库。但是，这些服务以专有格式生成跟踪。我想将这些跟踪转换为OpenTelemetry跟踪，并摄取到积家或APM解决方案。

我开始使用OpenTelemetry-Java SDK。

// This is a just converter service, trying to convert proprietary traces to OLTP
// Not interested in instrumenting this converter service. Following code does not show the proprietary trace reading and conversion for brevity.

// Converter service - reading first service 
private static void convert() {
   OpenTelemetry openTelemetry = ExampleConfiguration.initOpenTelemetry();
   Tracer tracer = openTelemetry.getTracer("io.opentelemetry.example");
   Span exampleSpan = tracer.spanBuilder("exampleSpan").startSpan();
   childOne(exampleSpan, openTelemetry);
   ...
}

// Converter service - reading second service
private static void childOne(Span parentSpan, OpenTelemetry openTelemetry) {
  Tracer tracer = openTelemetry.getTracer("service2");
  Span childSpan = tracer.spanBuilder("child").setParent(Context.current().with(parentSpan)).startSpan();
  try {
    Thread.sleep(4000);
  } catch (InterruptedException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }
  childSpan.end();
}

已配置适当的导出器。我可以像预期的那样在Jeager中看到这些痕迹。

​

但它只显示一个服务。

​

而我想描述两个不同的服务。使用OpenTelemetry可以吗？

​

​

Answer 1

基于Opentelemetry Java社区提供的一些提示，创建了两个提供者，实际上创建了两个服务。重用同一个导出器，避免多个后端连接。在接下来的几天里，我将学习更多关于重用exporter在同一应用程序中创建两个或更多提供程序的知识。

OpenTelemetry openTelemetryParent = ExampleConfiguration.initOpenTelemetry(jaegerHostName, jaegerPort,
        "FirstService");
    Tracer tracerParent = openTelemetryParent.getTracer("FirstServiceInstrumentation");

    OpenTelemetry openTelemetryChild = ExampleConfiguration.initOpenTelemetry(jaegerHostName, jaegerPort,
        "SecondService");
    Tracer tracerChild = openTelemetryChild.getTracer("SecondServiceInstrumentation");

    Random randomNum = new Random();

    for (int i = 0; i < 10; i++) {
      Span parentSpan = tracerParent.spanBuilder("MyService1Span").startSpan();
      try (Scope scope = parentSpan.makeCurrent()) {
        Thread.sleep(1 + randomNum.nextInt(100));
        secondService(parentSpan, tracerChild, randomNum.nextInt(300));
        Thread.sleep(1 + randomNum.nextInt(100));
      } catch (InterruptedException e) {
        e.printStackTrace();
      } finally {
        parentSpan.end();
      }
    }
  }

  private static void secondService(Span parentSpan, Tracer tracer, int delay) {
    Span childSpan = tracer.spanBuilder("MyService2Span").setParent(Context.current().with(parentSpan)).startSpan();
    try {
      Thread.sleep(delay);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
    childSpan.end();
  }

感谢令人惊叹的Opentelemetry java社区- @John Watson (jkwatson)，Bogdan Drutu，Rupinder Singh，Anuraag Agrawal。

Answer 2

您可以在代码中设置服务名称，如下所示：

Resource serviceNameResource = Resource.create(Attributes.of(ResourceAttributes.SERVICE_NAME, serviceName));

// Set to process the spans by the Jaeger Exporter
SdkTracerProvider tracerProvider =
    SdkTracerProvider.builder()
        .addSpanProcessor(SimpleSpanProcessor.create(jaegerExporter))
        .setResource(Resource.getDefault().merge(serviceNameResource))
        .build();

OpenTelemetrySdk openTelemetry =
    OpenTelemetrySdk.builder().setTracerProvider(tracerProvider).build();