使用feign和zuul问题汇总

1.错误Load balancer does not have available server for client:CONTENT-SERVICE解决办法

我也思考这个问题, 测试经常给我提bug, 还有前端一直问我请求不成功, 第一和第二次都有可能出现这个问题,接下来就没有这个问题,上网看了一下问题,

参考了Spring Cloud中，如何解决Feign/Ribbon第一次请求失败的问题？ 

解决方案是最后那个, 然后在调用方服务yml增加下面的配置(A调用B, 就在A配置):

ribbon:
  eager-load:
    enabled: true
    clients: content-service, product-service

启动的时候日志:

2019-06-02 11:24:26.874  INFO               15264 --- [           main] com.netflix.loadbalancer.DynamicServerListLoadBalancer                                                             : DynamicServerListLoadBalancer for client content-service initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=content-service,current list of Servers=[169.254.71.137:9021],Load balancer stats=Zone stats: {defaultzone=[Zone:defaultzone;	Instance count:1;	Active connections count: 0;	Circuit breaker tripped count: 0;	Active connections per server: 0.0;]
},Server stats: [[Server:169.254.71.137:9021;	Zone:defaultZone;	Total Requests:0;	Successive connection failure:0;	Total blackout seconds:0;	Last connection made:Thu Jan 01 08:00:00 CST 1970;	First connection made: Thu Jan 01 08:00:00 CST 1970;	Active Connections:0;	total failure count in last (1000) msecs:0;	average resp time:0.0;	90 percentile resp time:0.0;	95 percentile resp time:0.0;	min resp time:0.0;	max resp time:0.0;	stddev resp time:0.0]
]}ServerList:org.springframework.cloud.netflix.ribbon.eureka.DomainExtractingServerList@153409b8
2019-06-02 11:24:26.914  INFO               15264 --- [           main] org.springframework.context.annotation.AnnotationConfigApplicationContext                                          : Refreshing SpringClientFactory-product-service: startup date [Sun Jun 02 11:24:26 CST 2019]; parent: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@a10c1b5
2019-06-02 11:24:26.952  INFO               15264 --- [           main] org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor                                  : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2019-06-02 11:24:27.012  INFO               15264 --- [           main] com.netflix.config.ChainedDynamicProperty                                                                          : Flipping property: product-service.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
2019-06-02 11:24:27.020  INFO               15264 --- [           main] com.netflix.util.concurrent.ShutdownEnabledTimer                                                                   : Shutdown hook installed for: NFLoadBalancer-PingTimer-product-service
2019-06-02 11:24:27.021  INFO               15264 --- [           main] com.netflix.loadbalancer.BaseLoadBalancer                                                                          : Client: product-service instantiated a LoadBalancer: DynamicServerListLoadBalancer:{NFLoadBalancer:name=product-service,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:null
2019-06-02 11:24:27.022  INFO               15264 --- [           main] com.netflix.loadbalancer.DynamicServerListLoadBalancer                                                             : Using serverListUpdater PollingServerListUpdater
2019-06-02 11:24:27.024  INFO               15264 --- [           main] com.netflix.config.ChainedDynamicProperty                                                                          : Flipping property: product-service.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
2019-06-02 11:24:27.025  INFO               15264 --- [           main] com.netflix.loadbalancer.DynamicServerListLoadBalancer                                                             : DynamicServerListLoadBalancer for client product-service initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=product-service,current list of Servers=[169.254.71.137:9011],Load balancer stats=Zone stats: {defaultzone=[Zone:defaultzone;	Instance count:1;	Active connections count: 0;	Circuit breaker tripped count: 0;	Active connections per server: 0.0;]
},Server stats: [[Server:169.254.71.137:9011;	Zone:defaultZone;	Total Requests:0;	Successive connection failure:0;	Total blackout seconds:0;	Last connection made:Thu Jan 01 08:00:00 CST 1970;	First connection made: Thu Jan 01 08:00:00 CST 1970;	Active Connections:0;	total failure count in last (1000) msecs:0;	average resp time:0.0;	90 percentile resp time:0.0;	95 percentile resp time:0.0;	min resp time:0.0;	max resp time:0.0;	stddev resp time:0.0]
]}ServerList:org.springframework.cloud.netflix.ribbon.eureka.DomainExtractingServerList@63ad5fe7

 

 

上面日志说明了A找到B了, 问题就解决了

2. 第二问题使用zuul和feign会出现:

Caused by: java.lang.RuntimeException: java.net.SocketTimeoutException: Read timed out
	at rx.exceptions.Exceptions.propagate(Exceptions.java:58)
	at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:464)
	at rx.observables.BlockingObservable.single(BlockingObservable.java:341)
	at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:112)
	... 131 common frames omitted
Caused by: java.net.SocketTimeoutException: Read timed out

 超时问题, 问题出在哪里?有可能是熔断超时时间默认时间是1s, 由于是第一次, feign要找到client, 接着还要建立链接, 最后获取数据返回, 所以时间会超过1s, 报了上面的超时, 解决方案如下:

spring:
   #重试 
   cloud:
    loadbalancer:
      retry:
        enabled: true
ribbon:
# 这个是解决找不到服务
  eager-load:
    enabled: true
    clients: content-service, product-service
# 下面是解决超时的问题(下面的时间根据业务微调)
  ReadTimeout: 8000
  ConnectTimeout: 8000
hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 10000