文章目錄

• 項目場景：
• 問題描述
• 原因分析：
• 解決方案：
• • 開啟饑餓加載模式，啟動的時候初始化客戶端
  • 完整配置.yml示例

項目場景：

項目在部署到測試壞境過程中，項目已經成功啟動了，可是請求接口還是報500：

{"timestamp": "2022-05-09T03:15:41.117+00:00","status": 500,"error": "Internal Server Error","message": "" }

可是過了幾分鐘就能正常請求了。這就很疑惑，由于我們本地開發一般都不走網關測試的，所以我就在本地走網關測試，發現接口服務走網關，鑒權流程走完后，網關竟然報錯了。具體錯誤信息如下描述：

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問題描述

接口走網關鑒權報錯，錯誤信息：

2022-05-09 11:15:41.113 WARN [XNIO-1 task-1]o.s.cloud.netflix.zuul.filters.post.SendErrorFilter.run:84 Error during filtering com.netflix.zuul.exception.ZuulException: Forwarding errorat org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.handleException(RibbonRoutingFilter.java:198)at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.forward(RibbonRoutingFilter.java:173)at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.run(RibbonRoutingFilter.java:119)at com.netflix.zuul.ZuulFilter.runFilter(ZuulFilter.java:117)at com.netflix.zuul.FilterProcessor.processZuulFilter(FilterProcessor.java:193)at com.netflix.zuul.FilterProcessor.runFilters(FilterProcessor.java:157)at com.netflix.zuul.FilterProcessor.route(FilterProcessor.java:118)at com.netflix.zuul.ZuulRunner.route(ZuulRunner.java:96)at com.netflix.zuul.http.ZuulServlet.route(ZuulServlet.java:116)at com.netflix.zuul.http.ZuulServlet.service(ZuulServlet.java:81)at org.springframework.web.servlet.mvc.ServletWrappingController.handleRequestInternal(ServletWrappingController.java:166)at org.springframework.cloud.netflix.zuul.web.ZuulController.handleRequest(ZuulController.java:45)at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:52)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)at javax.servlet.http.HttpServlet.service(HttpServlet.java:497)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)at javax.servlet.http.HttpServlet.service(HttpServlet.java:584)at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:97)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68)at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)at io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68)at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:111)at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:269)at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:78)at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:133)at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:130)at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:249)at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:78)at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:99)at io.undertow.server.Connectors.executeRootHandler(Connectors.java:390)at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:836)at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:2019)at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1558)at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1449)at java.lang.Thread.run(Thread.java:748) Caused by: com.netflix.client.ClientException: Load balancer does not have available server for client: resourcecenterat org.springframework.cloud.netflix.ribbon.support.AbstractLoadBalancingClient.validateServiceInstance(AbstractLoadBalancingClient.java:153)at org.springframework.cloud.netflix.ribbon.apache.RetryableRibbonLoadBalancingHttpClient.lambda$execute$0(RetryableRibbonLoadBalancingHttpClient.java:100)at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:287)at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:180)at org.springframework.cloud.netflix.ribbon.apache.RetryableRibbonLoadBalancingHttpClient.executeWithRetry(RetryableRibbonLoadBalancingHttpClient.java:180)at org.springframework.cloud.netflix.ribbon.apache.RetryableRibbonLoadBalancingHttpClient.execute(RetryableRibbonLoadBalancingHttpClient.java:145)at org.springframework.cloud.netflix.ribbon.apache.RetryableRibbonLoadBalancingHttpClient.execute(RetryableRibbonLoadBalancingHttpClient.java:60)at org.springframework.cloud.netflix.zuul.filters.route.support.AbstractRibbonCommand.run(AbstractRibbonCommand.java:218)at org.springframework.cloud.netflix.zuul.filters.route.support.AbstractRibbonCommand.run(AbstractRibbonCommand.java:55)at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:302)at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:298)at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)at rx.Observable.unsafeSubscribe(Observable.java:10327)at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)at rx.Observable.unsafeSubscribe(Observable.java:10327)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)at rx.Observable.unsafeSubscribe(Observable.java:10327)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)at rx.Observable.unsafeSubscribe(Observable.java:10327)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)at rx.Observable.unsafeSubscribe(Observable.java:10327)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)at rx.Observable.unsafeSubscribe(Observable.java:10327)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)at rx.Observable.unsafeSubscribe(Observable.java:10327)at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)at rx.Observable.unsafeSubscribe(Observable.java:10327)at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)at rx.Observable.unsafeSubscribe(Observable.java:10327)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)at rx.Observable.unsafeSubscribe(Observable.java:10327)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)at rx.Observable.unsafeSubscribe(Observable.java:10327)at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)at rx.Observable.subscribe(Observable.java:10423)at rx.Observable.subscribe(Observable.java:10390)at rx.internal.operators.BlockingOperatorToFuture.toFuture(BlockingOperatorToFuture.java:51)at rx.observables.BlockingObservable.toFuture(BlockingObservable.java:410)at com.netflix.hystrix.HystrixCommand.queue(HystrixCommand.java:378)at com.netflix.hystrix.HystrixCommand.execute(HystrixCommand.java:344)at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.forward(RibbonRoutingFilter.java:167)... 67 common frames omitted

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原因分析：

接口請求網關，網關接收接口信息進行鑒權處理，由于啟動時沒及時加載可客戶端，導致通信鏈接提前關閉

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解決方案：

開啟饑餓加載模式，啟動的時候初始化客戶端

.yml添加配置：

#ribbon全局配置 ribbon:#開啟饑餓加載模式，啟動的時候初始化客戶端eager-load:enabled: true

.properties添加配置：

zuul:ribbon.eager-load.enabled: true

完整配置.yml示例

#ribbon全局配置 ribbon:#請求連接的超時時間ConnectTimeout: 60000#請求處理的超時時間ReadTimeout: 60000#當前實例最大重試次數MaxAutoRetries: 0#切換實例的重試次數MaxAutoRetriesNextServer: 1#對所有操作請求都進行重試OkToRetryOnAllOperations: true#開啟饑餓加載模式，啟動的時候初始化客戶端eager-load:enabled: true hystrix:command:default:execution:timeout:enabled: trueisolation:thread:timeoutInMilliseconds: 120000

timeoutInMilliseconds值要大于ribbon超時時間，而且不能使用timeout-in-milliseconds

總結

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