Zipkin初体验

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背景

Zipkin 是一个开放源代码分布式的跟踪系统，每个服务向zipkin报告计时数据，zipkin会根据调用关系通过Zipkin UI生成依赖关系图。

初体验

部署服务端

找台linux服务器，执行：

curl -sSL https://zipkin.io/quickstart.sh | bash -s
java -jar zipkin.jar
​

数据默认会存储在内存中，重启进程后数据就没有了。

纯JAVA客户端

pom依赖

<dependency>
            <groupId>io.zipkin.brave</groupId>
            <artifactId>brave</artifactId>
            <version>5.12.6</version>
        </dependency>

        <dependency>
            <groupId>io.zipkin.reporter2</groupId>
            <artifactId>zipkin-sender-okhttp3</artifactId>
            <version>2.15.2</version>
        </dependency>
​

代码示例：

import java.util.concurrent.TimeUnit;

import brave.Span;
import brave.Tracer;
import brave.Tracing;
import brave.context.log4j2.ThreadContextScopeDecorator;
import brave.propagation.ThreadLocalCurrentTraceContext;
import zipkin2.codec.SpanBytesEncoder;
import zipkin2.reporter.AsyncReporter;
import zipkin2.reporter.Sender;
import zipkin2.reporter.okhttp3.OkHttpSender;

public class TraceDemo {
    public static void main(String[] args) {
        Sender sender = OkHttpSender.create("http://127.0.0.1:9411/api/v2/spans");
        AsyncReporter asyncReporter = AsyncReporter.builder(sender)
            .closeTimeout(1000, TimeUnit.MILLISECONDS)
            .build(SpanBytesEncoder.JSON_V2);

        Tracing tracing = Tracing.newBuilder()
            .localServiceName("tracer-demo")
            .spanReporter(asyncReporter)
            // .propagationFactory(ExtraFieldPropagation.newFactory(B3Propagation.FACTORY, "user-name"))
            .currentTraceContext(
                ThreadLocalCurrentTraceContext.newBuilder().addScopeDecorator(ThreadContextScopeDecorator.create())
                    .build())// // puts trace IDs into logs
            .build();

        Tracer tracer = tracing.tracer();
        Span span = tracer.newTrace().name("encode").start();
        try {
            doSomethingExpensive();
        } finally {
            span.finish();
        }

        Span twoPhase = tracer.newTrace().name("twoPhase").start();
        try {
            Span prepare = tracer.newChild(twoPhase.context()).name("prepare").start();
            try {
                prepare();
            } finally {
                prepare.finish();
            }
            Span commit = tracer.newChild(twoPhase.context()).name("commit").start();
            try {
                commit();
            } finally {
                commit.finish();
            }
        } finally {
            twoPhase.finish();
        }
        sleep(1000);
    }

    private static void doSomethingExpensive() {
        sleep(500);
    }

    private static void commit() {
        sleep(500);
    }

    private static void prepare() {
        sleep(500);
    }

    private static void sleep(long milliseconds) {
        try {
            TimeUnit.MILLISECONDS.sleep(milliseconds);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}
​

数据包格式

通过抓包，可以看到Zipkin的数据包格式为：

[
	[{
		"traceId": "b15ea22da84801f3",
		"parentId": "b15ea22da84801f3",
		"id": "d4516b3c8d4777ef",
		"name": "prepare",
		"timestamp": 1603356689511178,
		"duration": 504408,
		"localEndpoint": {
			"serviceName": "tracer-demo"
		}
	}, {
		"traceId": "b15ea22da84801f3",
		"parentId": "b15ea22da84801f3",
		"id": "b18a3f2c02007c56",
		"name": "commit",
		"timestamp": 1603356690015732,
		"duration": 504033,
		"localEndpoint": {
			"serviceName": "tracer-demo"
		}
	}, {
		"traceId": "b15ea22da84801f3",
		"id": "b15ea22da84801f3",
		"name": "twophase",
		"timestamp": 1603356689511055,
		"duration": 1008958,
		"localEndpoint": {
			"serviceName": "tracer-demo"
		}
	}],
	[{
		"traceId": "cf045137964b3975",
		"id": "cf045137964b3975",
		"name": "encode",
		"timestamp": 1603356688967842,
		"duration": 502240,
		"localEndpoint": {
			"serviceName": "tracer-demo"
		}
	}]
]
​

查询页面

打开 http://127.0.0.1:9411/zipkin/，点 RUN QUERY，可见：

图片.png

图片.png

参考