SpringCloud重试 SpringCloud重试机制配置详解

时间:2021-03-28 张建斌人气:5

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首先声明一点，这里的重试并不是报错以后的重试，而是负载均衡客户端发现远程请求实例不可到达后，去重试其他实例。

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

feign重试机制

feign默认是通过自己包下的Retryer进行重试配置,默认是5次

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;
  }

feign取消重试

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

feign请求超时设置

@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);
}

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