feign.RetryableException: Read timed out executing

背景：

公司maven项目引入jar 包通过eureka调用 用户中心(公共平台) 用户相关接口 ，文章为记录所遇问题 。

启动类注解：

@EnableEurekaClient
@EnableFeignClients(basePackages = {"**目录**"})

配置：

eureka.client.serviceUrl.defaultZone = http://****/eureka/
eureka.client.register-with-eureka = true

问题介绍：
服务之间调用的时候偶现报错  Read timed out executing POST http://******

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feign.RetryableException: Read timed out executing GET http://******
        at feign.FeignException.errorExecuting(FeignException.java:67)
        at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:104)
        at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:76)
        at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103)
        at com.sun.proxy.$Proxy113.getBaseRow(Unknown Source)
Caused by: java.net.SocketTimeoutException: Read timed out
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
        at java.net.SocketInputStream.read(SocketInputStream.java:170)
        at java.net.SocketInputStream.read(SocketInputStream.java:141)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
        at java.io.BufferedInputStream.read1(BufferedInputStream.java:286)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
        at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:704)
        at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:647)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1569)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474)
        at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
        at feign.Client$Default.convertResponse(Client.java:152)
        at feign.Client$Default.execute(Client.java:74)
原因及解决办法：
明显可以看到是http请求报错超时，feign的调用分两层，ribbon的调用和hystrix的调用，高版本的hystrix默认是关闭的，所以在application.properties配置文件中设置ribbon即可

#请求处理的超时时间
ribbon.ReadTimeout: 120000
#请求连接的超时时间
ribbon.ConnectTimeout: 30000

如果开启hystrix，hystrix的超时报错如下图：

 FeignDemo#demo() timed-out and no fallback available。和ribbon超时报错还是有区别的

com.netflix.hystrix.exception.HystrixRuntimeException: FeignDemo#demo() timed-out and no fallback available.
    at com.netflix.hystrix.AbstractCommand$22.call(AbstractCommand.java:819)
    at com.netflix.hystrix.AbstractCommand$22.call(AbstractCommand.java:804)
    at rx.internal.operators.OperatorOnErrorResumeNextViaFunction$4.onError(OperatorOnErrorResumeNextViaFunction.java:140)
    at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
    at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
    at com.netflix.hystrix.AbstractCommand$DeprecatedOnFallbackHookApplication$1.onError(AbstractCommand.java:1472)
    at com.netflix.hystrix.AbstractCommand$FallbackHookApplication$1.onError(AbstractCommand.java:1397)
    at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
    at rx.observers.Subscribers$5.onError(Subscribers.java:230)
    Caused by: java.util.concurrent.TimeoutException
    at com.netflix.hystrix.AbstractCommand.handleTimeoutViaFallback(AbstractCommand.java:997)
    at com.netflix.hystrix.AbstractCommand.access$500(AbstractCommand.java:60)
    at com.netflix.hystrix.AbstractCommand$12.call(AbstractCommand.java:610)
    at com.netflix.hystrix.AbstractCommand$12.call(AbstractCommand.java:601)
解决办法：
 
feign.hystrix.enabled: true
hystrix 熔断机制
hystrix:
  shareSecurityContext: true
  command:
    default:
      circuitBreaker:
        sleepWindowInMilliseconds: 100000
        forceClosed: true
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 600000
--------------------- 
参考原文：https://blog.csdn.net/sayoko06/article/details/81329415 

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