Getting Started

Hello World examples

Both of these examples assume that Jaeger is running locally via Docker:

docker run -d -p 5775:5775/udp -p 16686:16686 jaegertracing/all-in-one:latest

These can be adapted to use other OpenTracing-compatible Tracer easily by adjusting the initialization code to match the particular implementation.

Java

Add the Jaeger libraries to your dependencies -

<dependency>
  <groupId>io.jaegertracing</groupId>
  <artifactId>jaeger-client</artifactId>
  <version>0.32.0</version>
</dependency>

import io.jaegertracing.Configuration;
import io.jaegertracing.Configuration.ReporterConfiguration;
import io.jaegertracing.Configuration.SamplerConfiguration;
import io.jaegertracing.internal.JaegerTracer;
import io.jaegertracing.internal.samplers.ConstSampler;
import io.opentracing.Span;
import io.opentracing.util.GlobalTracer;
...
SamplerConfiguration samplerConfig = SamplerConfiguration.fromEnv()
  .withType(ConstSampler.TYPE)
  .withParam(1);
ReporterConfiguration reporterConfig = ReporterConfiguration.fromEnv()
  .withLogSpans(true);
Configuration config = new Configuration("helloWorld")
  .withSampler(samplerConfig)
  .withReporter(reporterConfig);
GlobalTracer.register(config.getTracer());
...
Span parent = GlobalTracer.get().buildSpan("hello").start();
try (Scope scope = GlobalTracer.get().scopeManager()
      .activate(parent)) {
    Span child = GlobalTracer.get().buildSpan("world")
            .asChildOf(parent).start();
    try (Scope scope = GlobalTracer.get().scopeManager()
       .activate(child)) {
    }
}

Go

import (
    "github.com/opentracing/opentracing-go"
    "github.com/uber/jaeger-client-go"
    "github.com/uber/jaeger-client-go/config"
)
...
func main() {
    ...
    cfg := config.Configuration{
    Sampler: &config.SamplerConfig{
        Type:  "const",
        Param: 1,
    },
    Reporter: &config.ReporterConfig{
        LogSpans:            true,
        BufferFlushInterval: 1 * time.Second,
    },
    }
    tracer, closer, err := cfg.New(
        "your_service_name",
        config.Logger(jaeger.StdLogger),
    )
    opentracing.SetGlobalTracer(tracer)
    defer closer.Close()
    someFunction()
    ...
}
...
func someFunction() {
    parent := opentracing.GlobalTracer().StartSpan("hello")
    defer parent.Finish()
    child := opentracing.GlobalTracer().StartSpan(
    "world", opentracing.ChildOf(parent.Context()))
    defer child.Finish()
}

Self-guided Walkthrough Tutorials

Go

Take OpenTracing for a HotROD Ride involves successive optimizations of a Go-based Ride-on-Demand demonstration service, all informed by tracing data.

Java

MicroDonuts shows the reader how to get tracing instrumentation added to a multi-service app, and includes properly-configured initialization of several OpenTracing-compatible Tracers.

Multiple languages

The OpenTracing Tutorial provides an example combining Go, Java, Python, and Node.js.