Feign 客户端和 Spring 重试

Question

我有一个使用 Spring Cloud Feign 客户端调用外部服务的 RESTful 服务

@FeignClient(name = "external-service", configuration = FeignClientConfig.class)
public interface ServiceClient {

    @RequestMapping(value = "/test/payments", method = RequestMethod.POST)
    public void addPayment(@Valid @RequestBody AddPaymentRequest addPaymentRequest);

    @RequestMapping(value = "/test/payments/{paymentId}", method = RequestMethod.PUT)
    public ChangePaymentStatusResponse updatePaymentStatus(@PathVariable("paymentId") String paymentId,
            @Valid @RequestBody PaymentStatusUpdateRequest paymentStatusUpdateRequest);

}

我在过去 3 个月的日志文件中注意到以下失败 3-4 次：

json.ERROR_RESPONSE_BODY：连接拒绝执行POST http://external-service/external/paymentsjson.message:发送付款 添加付款失败其他原因：{ERROR_RESPONSE_BODY=Connection 拒绝执行 POST http://external-service/external/payments, EVENT=ADD_PAYMENT_FAILURE，TRANSACTION_ID=XXXXXXX} {} json.EVENT:ADD_PAYMENT_FAILURE json.stack_trace:feign.RetryableException：连接被拒绝 执行 POST http://external-service/external/payments at feign.FeignException.errorExecuting(FeignException.java:67) 在 feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:104) 在 feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:76) 在 feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103)

是否可以在 Feign 客户端上添加 Spring Retry。 我想用

注释 addPayment 操作

@Retryable(value = {feign.RetryableException.class }, maxAttempts = 3, backoff = @Backoff(delay = 2000, multiplier=2))

但这是不可能的，我还有什么其他选择？

Answer 1

您可以在FeignClientConfig 中添加Retryer

@Configuration
public class FeignClientConfig {

    @Bean
    public Retryer retryer() {
        return new Custom();
    }

}

class Custom implements Retryer {

    private final int maxAttempts;
    private final long backoff;
    int attempt;

    public Custom() {
        this(2000, 3);
    }

    public Custom(long backoff, int maxAttempts) {
        this.backoff = backoff;
        this.maxAttempts = maxAttempts;
        this.attempt = 1;
    }

    public void continueOrPropagate(RetryableException e) {
        if (attempt++ >= maxAttempts) {
            throw e;
        }

        try {
            Thread.sleep(backoff);
        } catch (InterruptedException ignored) {
            Thread.currentThread().interrupt();
        }
    }

    @Override
    public Retryer clone() {
        return new Custom(backoff, maxAttempts);
    }
}

更新了基于Retryer.Default 的示例Retryer 示例配置。

Answer 2

如果您使用的是功能区，您可以设置属性，您可以使用以下属性进行重试：

myapp.ribbon.MaxAutoRetries=5
myapp.ribbon.MaxAutoRetriesNextServer=5
myapp.ribbon.OkToRetryOnAllOperations=true

注意：“myapp”是您的服务 ID。

查看此Github implementation 以获取工作示例

Answer 3

如果它可以帮助某人，请添加它。我正在使用 feign 重置连接，因为该端口上正在运行一些未知进程。 尝试更改端口。 Refer this to find the process running on a port

Answer 4

刚刚新建了一个构造函数Default

@Configuration
public class FeignClientConfig {
    @Bean
    public Retryer retryer() {
        return new Retryer.Default(100, 2000, 3);
    }
}

Answer 5

我准备了一篇关于使用 Spring Retry 和 Feign Client 方法的博客文章。您可以考虑查看Post。所有步骤均已在帖子中说明。

Answer 6

这是我的配置。在 spring boot 2.2.0.RELEASE 中测试 OK 春云Hoxton.M3。

feign.hystrix.enabled=true
MY-SPRING-API.ribbon.MaxAutoRetries=2
MY-SPRING-API.ribbon.MaxAutoRetriesNextServer=2
MY-SPRING-API.ribbon.OkToRetryOnAllOperations=true
MY-SPRING-API.ribbon.retryableStatusCodes=404,500

feign.client.config.PythonPatentClient.connectTimeout=500
feign.client.config.PythonPatentClient.readTimeout=500

hystrix.command.PythonPatentClient#timeTest(String).execution.isolation.thread.timeoutInMilliseconds=5000

java代码是：

@FeignClient(name = "MY-SPRING-API",configuration = {PythonPatentConfig.class},fallbackFactory = FallBack.class)
public interface PythonPatentClient 
@RequestLine("GET /test?q={q}")
    void timeTest(@Param("appNo") String q);

控制器是：

  @RequestMapping(value = "/test",method = {RequestMethod.POST,RequestMethod.GET})
    public Object test() throws InterruptedException {
        log.info("========important print enter test========");
         TimeUnit.SECONDS.sleep(10L);

pom.xml 附加添加：

<dependency>
            <groupId>org.springframework.retry</groupId>
            <artifactId>spring-retry</artifactId>
   </dependency>

可选：

<dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aspects</artifactId>
    </dependency>

@EnableRetry
@SpringBootApplication
public class ApiApplication

这是文件：

https://docs.spring.io/spring-cloud-netflix/docs/2.2.10.RELEASE/reference/html/#retrying-failed-requests

https://github.com/spring-projects/spring-retry

https://github.com/spring-cloud/spring-cloud-netflix/

Answer 7

我通过在 ServiceClient 之上创建一个包装器解决了这个问题

@Configuration
public class ServiceClient {

@Autowired
ServiceFeignClient serviceFeignClient;

@Retryable(value = { ClientReprocessException.class }, maxAttemptsExpression = "#{${retryMaxAttempts}}", backoff = @Backoff(delayExpression = "#{${retryDelayTime}}"))

public void addPayment( AddPaymentRequest addPaymentRequest){
    return serviceFeignClient.addPayment(addPaymentRequest);
 }    
}