spring cloud 服務鏈路追蹤
阿新 • • 發佈:2018-11-04
簡介
Spring cloud Sleuth主要功能就是在分散式系統中提供追蹤解決方案,並且相容支援zipkin,你只需要在pom檔案中引入相應的依賴即可。
1、span
基本工作單元,span在不斷的啟動和停止,同時記錄了時間資訊,當你建立一相span,你必須在未來的某個時刻停止它。
2、trace
一系列span組成的一個樹狀結構。
3、annotation
用來及時記錄一個事件的存在。
(1)cs,client sent,
客戶發起一個請求,描述了這個span的開始。
(2)sr,server received
服務端獲得請求並準備開始處理它,sr-cs時間戳便可得到網路延遲。
(3)ss,server sent
請求返回客戶端,ss-sr時間戳可得到服務端需要的處理請求時間。
(4)cr , client received
表示span的結束,客戶端成功接收到服務端的回覆。
實戰
主要由三個工程組成:一個server-zipkin,它的主要作用是使用ZipKinServer的功能,收集資料,並展示,一個server-hi對外暴露hi介面,一個service-miya,對外暴露miya介面,這兩個service可以相互呼叫。
1、構建server-zipkin
(1)下載jar包,https://dl.bintray.com/openzipkin/maven/io/zipkin/java/zipkin-server/
(2)執行
java -jar zipkin-server-2.10.1-exec.jar
(3)訪問localhost:9411
2、建立service-hi
(1)pom
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.forezp</groupId> <artifactId>service-zipkin</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>service-hi</name> <description>Demo project for Spring Boot</description> <parent> <groupId>com.forezp</groupId> <artifactId>sc-f-chapter9</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-zipkin</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
(2)application.yml
server.port=8988
spring.zipkin.base-url=http://localhost:9411
spring.application.name=service-hi
(3)對外介面
import brave.sampler.Sampler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import java.util.logging.Level;
import java.util.logging.Logger;
@SpringBootApplication
@RestController
public class ServiceHiApplication {
public static void main(String[] args) {
SpringApplication.run(ServiceHiApplication.class, args);
}
private static final Logger LOG = Logger.getLogger(ServiceHiApplication.class.getName());
@Autowired
private RestTemplate restTemplate;
@Bean
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
@RequestMapping("/hi")
public String callHome(){
LOG.log(Level.INFO, "calling trace service-hi ");
return restTemplate.getForObject("http://localhost:8989/miya", String.class);
}
@RequestMapping("/info")
public String info(){
LOG.log(Level.INFO, "calling trace service-hi ");
return "i'm service-hi";
}
@Bean
public Sampler defaultSampler() {
return Sampler.ALWAYS_SAMPLE;
}
}
3、建立service-miya
import brave.sampler.Sampler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import java.util.logging.Level;
import java.util.logging.Logger;
@SpringBootApplication
@RestController
public class ServiceMiyaApplication {
public static void main(String[] args) {
SpringApplication.run(ServiceMiyaApplication.class, args);
}
private static final Logger LOG = Logger.getLogger(ServiceMiyaApplication.class.getName());
@RequestMapping("/hi")
public String home(){
LOG.log(Level.INFO, "hi is being called");
return "hi i'm miya!";
}
@RequestMapping("/miya")
public String info(){
LOG.log(Level.INFO, "info is being called");
return restTemplate.getForObject("http://localhost:8988/info",String.class);
}
@Autowired
private RestTemplate restTemplate;
@Bean
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
@Bean
public Sampler defaultSampler() {
return Sampler.ALWAYS_SAMPLE;
}
}
依次啟動上面的工程,訪問http://localhost:8989/miya,檢視http://localhost:9411/