假装客户端抛出HystrixTimeoutException,即使基础请求成功

Question

我有一个这样的假客户机，它的endpoint指向来自PROJECT-SERVICE的两个API

@FeignClient(name = "PROJECT-SERVICE", fallbackFactory = ProjectServiceFallbackFactory.class)
public interface ProjectServiceClient {
    
    @GetMapping("/api/projects/{projectKey}")
    public ResponseEntity<Project> getProjectDetails(@PathVariable("projectKey") String projectKey);

    @PostMapping("/api/projects")
    public ResponseEntity<Project> createProject(@RequestBody Project project);
}

@Service
public class MyService {
  
    @Autowired
    private ProjectServiceClient projectServiceClient;


    public void doSomething() {
         // Some code
         ResponseEntity<Project> projectResponse = projectServiceClient.getProjectDetails(projectKey);
         // Some more code
    }

    public void doSomethingElse() {
         // Some code
         ResponseEntity<Project> projectResponse = projectServiceClient.createProject(Project projectToBeCreated);
         // Some more code
    }
}

我最初以为下游的微服务（本例中为PROJECT-SERVICE）可能出了问题，但事实并非如此。事实上，当调用GetProjectDetails()或CreateProject()时，PROJECT-SERVICE实际上执行了该作业，并返回状态分别为200和201的ResponseEntity ，但我的回退是用HystrixTimeoutException激活的。

我在徒劳地寻找是什么引起了这个问题。

然而，我在我的主要应用程序配置中有以下内容：

feign.hystrix.enabled=true
feign.client.config.default.connect-timeout=5000
feign.client.config.default.read-timeout=60000

谢谢Sriram Sridharan

Answer 1

Hystrix的超时与Feign的超时没有联系。为Hystrix启用了默认的1秒执行超时。您需要将此超时配置为略长于feign的超时，以避免HystrixTimeoutException在所需超时之前抛出。例如：

feign.client.config.default.connect-timeout=5000
feign.client.config.default.read-timeout=5000
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=6000

这样做将允许首先抛出由5秒后超时引起的FeignException，然后包装在HystrixTimeoutException中