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SpringCloud微服务调用时常见错误解读

SpringCloutFeignTimeoutLoad balancer 
阅读更多
***************************
2019-11-14 19:50:17.565 [TextMsgReceiverThreadInFuture-3] [ERROR] [com.yourcompany.ms.iov.utils.MqttClientSubMsgInFuture:682] - =An unknown exception is:=
java.lang.RuntimeException: com.netflix.client.ClientException: Load balancer does not have available server for client: yourcompany-ms-platform-backend-api
        at org.springframework.cloud.netflix.feign.ribbon.LoadBalancerFeignClient.execute(LoadBalancerFeignClient.java:71) ~[spring-cloud-netflix-core-1.4.4.RELEASE.jar!/:1.4.4.RELEASE]
        at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:97) ~[feign-core-9.5.0.jar!/:?]
        at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:76) ~[feign-core-9.5.0.jar!/:?]
        at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103) ~[feign-core-9.5.0.jar!/:?]
        at com.sun.proxy.$Proxy150.add(Unknown Source) ~[?:?]
        at com.yourcompany.ms.iov.utils.MqttClientSubMsgInFuture.receiveMessage(MqttClientSubMsgInFuture.java:640) [classes!/:1.0-SNAPSHOT]
        at com.yourcompany.ms.iov.utils.MqttClientSubMsgInFuture.run(MqttClientSubMsgInFuture.java:284) [classes!/:1.0-SNAPSHOT]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_74]
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [?:1.8.0_74]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_74]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [?:1.8.0_74]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_74]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_74]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_74]
Caused by: com.netflix.client.ClientException: Load balancer does not have available server for client: yourcompany-ms-platform-backend-api
        at com.netflix.loadbalancer.LoadBalancerContext.getServerFromLoadBalancer(LoadBalancerContext.java:483) ~[ribbon-loadbalancer-2.2.5.jar!/:2.2.5]
        at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:184) ~[ribbon-loadbalancer-2.2.5.jar!/:2.2.5]
        at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:180) ~[ribbon-loadbalancer-2.2.5.jar!/:2.2.5]
        at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:94) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:42) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber$1.call(OperatorRetryWithPredicate.java:127) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.java:73) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.schedule(TrampolineScheduler.java:52) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:79) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:45) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.util.ScalarSynchronousObservable$WeakSingleProducer.request(ScalarSynchronousObservable.java:276) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.Subscriber.setProducer(Subscriber.java:209) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:138) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:129) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.Observable.subscribe(Observable.java:10247) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.Observable.subscribe(Observable.java:10214) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:444) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.observables.BlockingObservable.single(BlockingObservable.java:341) ~[rxjava-1.2.0.jar!/:1.2.0]
        at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:112) ~[ribbon-loadbalancer-2.2.5.jar!/:2.2.5]
        at org.springframework.cloud.netflix.feign.ribbon.LoadBalancerFeignClient.execute(LoadBalancerFeignClient.java:63) ~[spring-cloud-netflix-core-1.4.4.RELEASE.jar!/:1.4.4.RELEASE]
        ... 13 more
******************************************************************
2019-11-14 16:47:02.136 [PollingServerListUpdater-0] [INFO ] [com.netflix.config.ChainedDynamicProperty:115] - Flipping property: yourcompany-ms-platform-backend-api.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
2019-11-14 16:47:21.316 [TextMsgReceiverThreadInFuture-3] [ERROR] [com.yourcompany.ms.iov.utils.MqttClientSubMsgInFuture:682] - =An unknown exception is:=
feign.RetryableException: Read timed out executing GET http://yourcompany-ms-platform-backend-api/sendTerminalCommand/onevendor/login
        at feign.FeignException.errorExecuting(FeignException.java:67) ~[feign-core-9.5.0.jar!/:?]
        at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:104) ~[feign-core-9.5.0.jar!/:?]
        at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:76) ~[feign-core-9.5.0.jar!/:?]
        at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103) ~[feign-core-9.5.0.jar!/:?]
        at com.sun.proxy.$Proxy119.login(Unknown Source) ~[?:?]
        at com.yourcompany.ms.iov.utils.MqttClientSubMsgInFuture.receiveMessage(MqttClientSubMsgInFuture.java:416) [classes!/:1.0-SNAPSHOT]
        at com.yourcompany.ms.iov.utils.MqttClientSubMsgInFuture.run(MqttClientSubMsgInFuture.java:284) [classes!/:1.0-SNAPSHOT]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_74]
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [?:1.8.0_74]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_74]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [?:1.8.0_74]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_74]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_74]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_74]
Caused by: java.net.SocketTimeoutException: Read timed out
        at java.net.SocketInputStream.socketRead0(Native Method) ~[?:1.8.0_74]
        at java.net.SocketInputStream.socketRead(SocketInputStream.java:116) ~[?:1.8.0_74]
        at java.net.SocketInputStream.read(SocketInputStream.java:170) ~[?:1.8.0_74]
        at java.net.SocketInputStream.read(SocketInputStream.java:141) ~[?:1.8.0_74]
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:246) ~[?:1.8.0_74]
        at java.io.BufferedInputStream.read1(BufferedInputStream.java:286) ~[?:1.8.0_74]
        at java.io.BufferedInputStream.read(BufferedInputStream.java:345) ~[?:1.8.0_74]
        at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:704) ~[?:1.8.0_74]
        at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:647) ~[?:1.8.0_74]
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1536) ~[?:1.8.0_74]
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441) ~[?:1.8.0_74]
        at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480) ~[?:1.8.0_74]
        at feign.Client$Default.convertResponse(Client.java:152) ~[feign-core-9.5.0.jar!/:?]
        at feign.Client$Default.execute(Client.java:74) ~[feign-core-9.5.0.jar!/:?]
        at org.springframework.cloud.netflix.feign.ribbon.FeignLoadBalancer.execute(FeignLoadBalancer.java:80) ~[spring-cloud-netflix-core-1.4.4.RELEASE.jar!/:1.4.4.RELEASE]
        at org.springframework.cloud.netflix.feign.ribbon.FeignLoadBalancer.execute(FeignLoadBalancer.java:48) ~[spring-cloud-netflix-core-1.4.4.RELEASE.jar!/:1.4.4.RELEASE]
        at com.netflix.client.AbstractLoadBalancerAwareClient$1.call(AbstractLoadBalancerAwareClient.java:104) ~[ribbon-loadbalancer-2.2.5.jar!/:2.2.5]
        at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:303) ~[ribbon-loadbalancer-2.2.5.jar!/:2.2.5]
        at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:287) ~[ribbon-loadbalancer-2.2.5.jar!/:2.2.5]
        at rx.internal.util.ScalarSynchronousObservable$3.call(ScalarSynchronousObservable.java:231) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.util.ScalarSynchronousObservable$3.call(ScalarSynchronousObservable.java:228) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeConcatMap$ConcatMapSubscriber.drain(OnSubscribeConcatMap.java:286) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeConcatMap$ConcatMapSubscriber.onNext(OnSubscribeConcatMap.java:144) ~[rxjava-1.2.0.jar!/:1.2.0]
        at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:185) ~[ribbon-loadbalancer-2.2.5.jar!/:2.2.5]
        at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:180) ~[ribbon-loadbalancer-2.2.5.jar!/:2.2.5]
        at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:94) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:42) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber$1.call(OperatorRetryWithPredicate.java:127) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.java:73) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.schedule(TrampolineScheduler.java:52) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:79) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:45) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.util.ScalarSynchronousObservable$WeakSingleProducer.request(ScalarSynchronousObservable.java:276) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.Subscriber.setProducer(Subscriber.java:209) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:138) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:129) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.Observable.subscribe(Observable.java:10247) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.Observable.subscribe(Observable.java:10214) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:444) ~[rxjava-1.2.0.jar!/:1.2.0]
        at rx.observables.BlockingObservable.single(BlockingObservable.java:341) ~[rxjava-1.2.0.jar!/:1.2.0]
        at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:112) ~[ribbon-loadbalancer-2.2.5.jar!/:2.2.5]
        at org.springframework.cloud.netflix.feign.ribbon.LoadBalancerFeignClient.execute(LoadBalancerFeignClient.java:63) ~[spring-cloud-netflix-core-1.4.4.RELEASE.jar!/:1.4.4.RELEASE]
        at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:97) ~[feign-core-9.5.0.jar!/:?]
        ... 12 more
*******************************************************************
【关键错误】
com.netflix.client.ClientException: Load balancer does not have available server for client:
【分析】
1、首先通过错误栈确认下调用微服务的方式，通过FeginClient还是RestTemplate；
2、确认此处为FeignClient方式；
3、从错误提示解读：负载均衡器未找到可用的微服务；说明Euerka上未找到对应的微服务；
4、通过Eureka上查看提供微服务方，是否注册正常；
yourcompany-ms-platform-backend-api:18.0.5.107:18903 , yourcompany-ms-platform-backend-api:18.0.5.108:18903
Tip：正常应该为此方式；
5、检查微服务提供方是否添加如下注解：@FeignClient 
@FeignClient(name = "yourcompany-ms-platform-ivt-service")
public interface IvtTextCmdPubRMI {
}

6、检查微服务调用方main启动类是否添加如下注解：@SpringBootApplication 
@EnableDiscoveryClient
@EnableFeignClients(basePackages = { "com.yourcompany" })
@SpringBootApplication
@ComponentScan(basePackages = { "com.yourcompany" })
public class Application {

	private final static String EMQX_Cluster_Topic_Name = CommonToolsUtils.generateTopic4TxtCmd2SInGroup();

	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
}
}

7、确认微服务提供方节点，是否端口号【18903】已Listen就绪；
telnet ip port 确认下

【关键错误】
feign.RetryableException: Read timed out executing GET http://yourcompany-ms-platform-backend-api/sendTerminalCommand/onevendor/login
【分析】
如果没有提示上面的错误【Load balancer does not have available server for client】，则考虑如下：
1> 微服务提供方本身进程是启动ok的；
2> 微服务提供方的配置也是ok的；
3> 需要检查微服务提供方，在接口运行处是否报错；
>>> 一般是微服务方进程ok，但提供服务逻辑处，连接外部资源报错，导致服务本身被访问时timeout了；
>>> 或者通过ip和port直接访问微服务提供方，是否接口本身是ok的，也可以排除此问题；


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