If the invocation interval between trace.StartSpan and span.End() is too small,I can't find my service registered in jaeger on Jaeger UI

[XianLeiGirl]

problem

my code is come from quickstart
I replace openzipkin with jaeger:

package main

import (
	"bytes"
	"context"
	"encoding/binary"
	"fmt"
	"log"
	"time"

	"contrib.go.opencensus.io/exporter/jaeger"
	"go.opencensus.io/trace"
)

func main() {
	//// 1. Configure exporter to export traces to Zipkin.
	//localEndpoint, err := openzipkin.NewEndpoint("go-quickstart", "192.168.1.5:5454")
	//if err != nil {
	//	log.Fatalf("Failed to create the local zipkinEndpoint: %v", err)
	//}
	//reporter := zipkinHTTP.NewReporter("http://localhost:9411/api/v2/spans")
	//ze := zipkin.NewExporter(reporter, localEndpoint)
	//trace.RegisterExporter(ze)
	//
	//// 2. Configure 100% sample rate, otherwise, few traces will be sampled.
	//trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})

	agentEndpointURI := "http://localhost:6831"
	collectorEndpointURI := "http://localhost/api/traces"

	je, err := jaeger.NewExporter(jaeger.Options{
		AgentEndpoint:     agentEndpointURI,
		CollectorEndpoint: collectorEndpointURI,
		ServiceName:       "demo",
	})
	if err != nil {
		log.Fatalf("Failed to create the Jaeger exporter: %v", err)
	}

	// 3. Create a span with the background context, making this the parent span.
	// A span must be closed.
	ctx, span := trace.StartSpan(context.Background(), "main")
	// 5b. Make the span close at the end of this function.
	defer span.End()

	for i := 0; i < 10; i++ {
		doWork(ctx)
	}
}

func doWork(ctx context.Context) {
	// 4. Start a child span. This will be a child span because we've passed
	// the parent span's ctx.
	_, span := trace.StartSpan(ctx, "doWork")
	// 5a. Make the span close at the end of this function.
	defer span.End()

	fmt.Println("doing busy work")
	time.Sleep(80 * time.Millisecond)
	buf := bytes.NewBuffer([]byte{0xFF, 0x00, 0x00, 0x00})
	num, err := binary.ReadVarint(buf)
	if err != nil {
		// 6. Set status upon error
		span.SetStatus(trace.Status{
			Code:    trace.StatusCodeUnknown,
			Message: err.Error(),
		})
	}

	// 7. Annotate our span to capture metadata about our operation
	span.Annotate([]trace.Attribute{
		trace.Int64Attribute("bytes to int", num),
	}, "Invoking doWork")
	time.Sleep(20 * time.Millisecond)
}

when I run my program and access port 16686 of the Jaeger UI,I can't find my service registered in jaeger on the Jaeger UI

solution

just replace "time.Sleep(20 * time.Millisecond)" with "time.Sleep(time.Second)"

why is that?

[iideas18]

Hi, you Install these tools without encountering issues19???

[XianLeiGirl]

no,I install jaeger with command: "docker run -d --name jaeger -p 6831:6831/udp -p 16686:16686 -p 14268:14268 jaegertracing/all-in-one:1.16"

[iideas18]

how can you import this mod, if you did not install "contrib.go.opencensus.io/exporter/jaeger" in your code?

[XianLeiGirl]

maybe I understand that I go get "contrib.go.opencensus.io/exporter/jaeger" to import this to my mod?

[iideas18]

I think so.

[XianLeiGirl]

But that's what I'm doing now, I still don't understand why my problem happened.