解决：The Hystrix timeout of ***ms for the command *** is set lower than the combination of the Ribbon read and connect timeout

项目具体报错如下：

2019-09-19 17:46:48.283 [http-nio-7777-exec-3] WARN  o.s.c.n.z.f.route.support.AbstractRibbonCommand - The Hystrix timeout of 5000ms for the command SERVICE is set lower than the combination of the Ribbon read and connect timeout, 400000ms.

分析：

Ribbon 总时间ribbonTimeout = (ribbonReadTimeout + ribbonConnectTimeout) * (maxAutoRetries + 1) * (maxAutoRetriesNextServer + 1);
笔者这里的具体值为：（5000+5000）*（1+1）*（1+1）=40000；

而Hystrix 时间为：5000，具体办法也好办，在配置文件中修改超时为：

hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 40000

 或者修改ribbon配置：

AUSERVICE:  #这是ribion要请求的serviceID
  ribbon:
    ReadTimeout: 2000
    ConnectTimeout: 2000
    MaxAutoRetries: 0
    MaxAutoRetriesNextServer: 0

即：(2000+2000)*(0+1)*(0+1)=4000<5000也可。