feign.RetryableException: Read timed out executing—SpringCloud组件Feign连接超时处理

一、问题描述

目前大部分公司都是使用微服务架构，自然免不了服务间的调用，在服务调用的过程中，可能会出现连接超时或者读取超时的问题。接下来针对SpringCloud组件Feign的超时问题从根源上看一下如何解决。

feign.RetryableException: Read timed out executing(请求方式)(请求地址)
        at feign.FeignException.errorExecuting(FeignException.java:65)
        at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:105)
        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)

二、解决方案

在yml文件中配置connectTimeout和readTimeout

feign:
    client:
        config:default:
                connectTimeout:60000
                readTimeout:60000

三、源码追踪（知其然，知其所以然）

1、首先看下日志报错打印 FeignException.java:67、SynchronousMethodHandler.java:104

2、查看options（HTTP请求的配置）的初始化

3、options的默认值和配置

源码追踪到这可以看出feign请求的默认连接超时时间为10秒 读取超时时间为60秒

3、FeignClientProperties的config属性

FeignClientProperties是Feign客户端的配置类，对应我们在yml文件中的feign.client。
我们可以通过配置connectTimeout和readTimeout的大戏