springcloud中Feign超时提示Read timed out executing POST的问题及解决方法

springcloud之Feign超时提示Read timed out executing POST

问题描述： 

Feign接口调用分两层，Ribbon的调用和Hystrix调用，理论上设置Ribbon的时间即可，但是Ribbon的超时时间和Hystrix的超时时间需要结合起来，按照木桶原则最低的就是Feign的超时时间，建议最好配置超时时间一致.当Fegin调用时，调用的外部接口，延迟挺大，会造成Feign一直提示Read timed out executing POST

解决方法：

yml文件中如下配置即可

#hystrix的超时时间
hystrix:
    command:
        default:
            execution:
              timeout:
                enabled: true
              isolation:
                    thread:
                        #超时设置
                        timeoutInMilliseconds: 30000
ribbon:
  ReadTimeout: 30000
  #ribbon的超时时间
  ConnectTimeout: 30000

补充：

spring cloud 调用feign请求超时 feign.RetryableException: Read timed out executing POST

问题介绍：

服务之间调用报错超时，截取部分报错，Read timed out executing POST http://******

feign.RetryableException: Read timed out executing POST 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

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