FeignException ServiceUnavailable：负载均衡器不包含服务 match-result-service 的实例

Question

我不明白，也找不到任何关于如何修复主题异常的解释。

这是我使用的主要代码：

尤里卡服务器

应用：

...
@SpringBootApplication
@EnableEurekaServer
public class BbSimApplication {

    public static void main(String[] args) {
        SpringApplication.run(BbSimApplication.class, args);
    }
}

application.yml:

server.port : 8088

spring: 
    application: 
        name : bbsim-discovery-server

eureka:
    server:
        evictionIntervalTimerInMs: 3000
        response-cache-update-interval-ms: 3000
        wait-time-in-ms-when-sync-empty: 0
        peer-node-read-timeout-ms : 10000
    client:
        registerWithEureka: false
        fetchRegistry: false
        service-url: 
            defaultZone: http://localhost:${server.port}/eureka

控制器类：

@RestController
public class WebController {

    @Autowired private WebService webService;

    @GetMapping("/matchresultbyids")
    public MatchStats matchResult(@RequestParam Long homeId, @RequestParam Long awayId){

        return webService.matchResult(homeId, awayId);
    }
}

---

经理服务

应用：

@SpringBootApplication
@EnableFeignClients
@EnableDiscoveryClient
public class BBSimManagerServiceApplication {

    public static void main(String[] args) {
        SpringApplication.run(BBSimManagerServiceApplication.class, args);
    }
}

application.yaml：

server.port: 9903

spring:
    application.name: bbsim-manager-service
eureka:
    client:
        serviceUrl:
            defaultZone: ${EUREKA_URI:http://localhost:8088/eureka}
            registryFetchIntervalSeconds: 1
            # register-with-eureka: true
            # fetch-registry: true
    instance:
        leaseRenewalIntervalInSeconds: 1

客户端界面：

@FeignClient("match-result-service")
public interface MatchResultClient {

    @GetMapping("/matchresultbyids")
    MatchStats getMatchResult();
}

控制器类：

@RestController
public class BbsimManagerController {
    
    @Autowired
    MatchResultClient matchStatsClient;
 
    @GetMapping("/matchresultbyids")
    public MatchStats matchResult(){

        return matchStatsClient.getMatchResult();
    }
}

---

匹配结果服务

应用：

@SpringBootApplication
@EnableDiscoveryClient
public class MatchResultServiceApplication {

    public static void main(String[] args) {
        SpringApplication.run(MatchResultServiceApplication.class, args);
    }

}

application.yml:

server.port: 9901

spring:
    application:
        name: match-result-service
eureka:
    client:
        serviceUrl:
            defaultZone: http://localhost:8088/eureka/
            registryFetchIntervalSeconds: 1
            instance:
                leaseRenewalIntervalInSeconds: 1

控制器：

@RestController
public class WebController {

    @Autowired private WebService webService;

    @GetMapping("/matchresultbyids")
    public MatchStats matchResult(){

        return webService.matchResult();
    }
}

当我尝试执行时：

http://localhost:9903/matchresultbyids

我得到了例外：

o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is feign.FeignException$ServiceUnavailable: [503] during [GET] to [http://match-result-service/matchresultbyids?homeId=0&awayId=1] [MatchResultClient#getMatchResult()]: [Load balancer does not contain an instance for the service match-result-service]] with root cause

feign.FeignException$ServiceUnavailable: [503] during [GET] to [http://match-result-service/matchresultbyids?homeId=0&awayId=1] [MatchResultClient#getMatchResult()]: [Load balancer does not contain an instance for the service match-result-service]

你能告诉我哪里出了问题以及如何解决它吗？

谢谢大家。

Answer 1

可能与 OpenFeign bug 有关。您可以尝试将其升级到版本 >= v3.0.6。 如果你使用 spring-cloud-dependencies 版本 >= v2020.0.5 应该也可以。