Spring Cloud重试机制与各组件的重试总结

@Bean
@LoadBalanced
RestTemplate restTemplate() {
  HttpComponentsClientHttpRequestFactory httpRequestFactory = new HttpComponentsClientHttpRequestFactory();
  httpRequestFactory.setReadTimeout(5000);
  httpRequestFactory.setConnectTimeout(5000);
  return new RestTemplate(httpRequestFactory);
}

package feign;

import static java.util.concurrent.TimeUnit.SECONDS;

/**
 * Cloned for each invocation to {@link Client#execute(Request, feign.Request.Options)}.
 * Implementations may keep state to determine if retry operations should continue or not.
 */
public interface Retryer extends Cloneable {

 /**
  * if retry is permitted, return (possibly after sleeping). Otherwise propagate the exception.
  */
 void continueOrPropagate(RetryableException e);

 Retryer clone();

 public static class Default implements Retryer {

  private final int maxAttempts;
  private final long period;
  private final long maxPeriod;
  int attempt;
  long sleptForMillis;

  public Default() {
   this(100, SECONDS.toMillis(1), 5);
  }

  public Default(long period, long maxPeriod, int maxAttempts) {
   this.period = period;
   this.maxPeriod = maxPeriod;
   this.maxAttempts = maxAttempts;
   this.attempt = 1;
  }

@Bean
Retryer feignRetryer() {
return Retryer.NEVER_RETRY;
}

@Bean
Request.Options requestOptions(ConfigurableEnvironment env){
  int ribbonReadTimeout = env.getProperty("ribbon.ReadTimeout", int.class, 6000);
  int ribbonConnectionTimeout = env.getProperty("ribbon.ConnectTimeout", int.class, 3000);

  return new Request.Options(ribbonConnectionTimeout, ribbonReadTimeout);
}

@Bean
@LoadBalanced
public RestTemplate restTemplate() {
 SimpleClientHttpRequestFactory simpleClientHttpRequestFactory = new SimpleClientHttpRequestFactory();
 simpleClientHttpRequestFactory.setConnectTimeout(1000);
 simpleClientHttpRequestFactory.setReadTimeout(1000);
 return new RestTemplate(simpleClientHttpRequestFactory);
}

spring:
 cloud:
 loadbalancer:
  retry:
  enabled: true
ribbon:
 # 同一实例最大重试次数，不包括首次调用
 MaxAutoRetries: 1
 # 重试其他实例的最大重试次数，不包括首次所选的server
 MaxAutoRetriesNextServer: 2
 # 是否所有操作都进行重试
 OkToRetryOnAllOperations: false

ribbon:
 MaxAutoRetries: 1
 MaxAutoRetriesNextServer: 2
 OkToRetryOnAllOperations: false

zuul:
 # 开启Zuul的重试
 retryable: true
ribbon:
 MaxAutoRetries: 1
 MaxAutoRetriesNextServer: 2
 OkToRetryOnAllOperations: false

zuul.routes.<routename>.retryable=true

clientName:
 ribbon:
  retryableStatusCodes: 404,502