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。

Table 1. ribbon重试配置

ribbon.OkToRetryOnAllOperations

false(`是否所有操作都重试`)

ribbon.MaxAutoRetriesNextServer

2(`重试负载均衡其他的实例最大重试次数,不包括首次server`)

ribbon.MaxAutoRetries

1(`同一台实例最大重试次数,不包括首次调用`)

spring.cloud.loadbalancer.retry.enabled

true(`重试机制开关`)

 

ribbon针对http的readTimeout和connectTimeCount直接用配置 ribbon.ReadTimeout和ribbon.ConnectTimeout是无效的。配置方式参考以下代码

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

Table 2. zuul重试配置

zuul.retryable

true(`重试机制开关`)

ribbon.OkToRetryOnAllOperations

false(`是否所有操作都重试`)

ribbon.MaxAutoRetriesNextServer

2(`重试负载均衡其他的实例最大重试次数,不包括首次server`)

ribbon.MaxAutoRetries

1(`同一台实例最大重试次数,不包括首次调用`)

ribbon.ConnectTimeout

6000(`http建立socket超时时间`)

ribbon.ReadTimeout

6000(`http读取响应socket超时时间`)

hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds

10000(断路器线程池超时时间,这个值一定要比ribbon超时时间长)

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);
}

Last updated 2017-05-18 23:39:30 CST