本文探讨了 Spring Cloud 中 Feign 进行服务间调用时出现的超时错误及其解决方法，包括配置 Ribbon 和 Hystrix 的超时时间。
目前，在Spring cloud 中服务之间通过restful方式调用有两种方式
- restTemplate+Ribbon
- feign
https://blog.youkuaiyun.com/jrn1012/article/details/77837658
(1) 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)atcom.sun.proxy.
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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)atfeign.Client
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Default.execute(Client.java:74)
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
## feign.hystrix.enabled: true
##hystrix 熔断机制
##hystrix:
##shareSecurityContext: true
##command:
##default:
##circuitBreaker:
## sleepWindowInMilliseconds: 100000
##forceClosed: true
##execution:
##isolation:
##thread:
## timeoutInMilliseconds: 600000
如果开启hystrix，hystrix的超时报错如下,此时就得设置hystrix
com.netflix.hystrix.exception.HystrixRuntimeException: FeignDemo#demo() timed-out and no fallback available.
at com.netflix.hystrix.AbstractCommand
22.call(AbstractCommand.java:819)atcom.netflix.hystrix.AbstractCommand
22.
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22.call(AbstractCommand.java:804)
at rx.internal.operators.OperatorOnErrorResumeNextViaFunction
4.onError(OperatorOnErrorResumeNextViaFunction.java:140)atrx.internal.operators.OnSubscribeDoOnEach
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DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
at rx.internal.operators.OnSubscribeDoOnEach
DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)atcom.netflix.hystrix.AbstractCommand
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DeprecatedOnFallbackHookApplication
1.onError(AbstractCommand.java:1472)atcom.netflix.hystrix.AbstractCommand
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FallbackHookApplication
1.onError(AbstractCommand.java:1397)atrx.internal.operators.OnSubscribeDoOnEach
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DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
at rx.observers.Subscribers
5.onError(Subscribers.java:230)Causedby:java.util.concurrent.TimeoutExceptionatcom.netflix.hystrix.AbstractCommand.handleTimeoutViaFallback(AbstractCommand.java:997)atcom.netflix.hystrix.AbstractCommand.access
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500(AbstractCommand.java:60)
at com.netflix.hystrix.AbstractCommand
12.call(AbstractCommand.java:610)atcom.netflix.hystrix.AbstractCommand
12.
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12.call(AbstractCommand.java:601)
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