Feign client and Spring retry - spring

Question

I have a restful service calling an external service using Spring Cloud Feign client
#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);
}
I noticed the following failure 3-4 times in the last 3 months in my log file:
json.ERROR_RESPONSE_BODY:Connection refused executing POST
http://external-service/external/payments json.message:Send Payment
Add Payment Failure For other reason: {ERROR_RESPONSE_BODY=Connection
refused executing POST http://external-service/external/payments,
EVENT=ADD_PAYMENT_FAILURE, TRANSACTION_ID=XXXXXXX} {}
json.EVENT:ADD_PAYMENT_FAILURE
json.stack_trace:feign.RetryableException: Connection refused
executing POST http://external-service/external/payments at
feign.FeignException.errorExecuting(FeignException.java:67) at
feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:104)
at
feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:76)
at
feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103)
Is it possible to add Spring Retry on a Feign client.
What I wanted to annotate the addPayment operation with
#Retryable(value = {feign.RetryableException.class }, maxAttempts = 3, backoff = #Backoff(delay = 2000, multiplier=2))
But this is not possible, what other options do I have?

Answer 1

You can add a Retryer in the FeignClientConfig
#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);
}
}
Updated with sample Retryer example config based on the Retryer.Default.

Answer 2

If you are using ribbon you can set properties, you can use below properties for retry:
myapp.ribbon.MaxAutoRetries=5
myapp.ribbon.MaxAutoRetriesNextServer=5
myapp.ribbon.OkToRetryOnAllOperations=true
Note: "myapp" is your service id.
Checkout this Github implementation for working example

Answer 3

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

Answer 4

Adding this if it can help someone. I was getting connection reset using feign, as some unknown process was running on that port.
Try changing the port. Refer this to find the process running on a port

Answer 5

I prepared a blog post about using Spring Retry with Feign Client methods. You may consider checking the Post. All steps have been explained in the post.

Answer 6

This is my config. Test OK in spring boot 2.2.0.RELEASE
spring cloud 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 code is :
#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);
Controller is :
#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 additon add:
<dependency>
<groupId>org.springframework.retry</groupId>
<artifactId>spring-retry</artifactId>
</dependency>
optional:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
</dependency>
#EnableRetry
#SpringBootApplication
public class ApiApplication
this is document :
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

I resolved that by creating a wrapper on top of ServiceClient
#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);
}
}