故障现象

原项目使用zk作为注册中心，连接正常。zk添加口令后，项目连接zk失败。

配置信息

Zookeeper服务版本

Zookeeper version: 3.4.5-1392090

Zookeeper客户端配置

<dependency><groupId>org.apache.curator</groupId><artifactId>curator-x-discovery</artifactId><version>4.0.0</version><exclusions><exclusion><groupId>org.apache.zookeeper</groupId><artifactId>zookeeper</artifactId></exclusion></exclusions>
</dependency>
<dependency><artifactId>zookeeper</artifactId><groupId>org.apache.zookeeper</groupId><version>3.4.5</version>
</dependency>

dubbo的依赖配置

<dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo-spring-boot-starter</artifactId><version>2.7.12</version>
</dependency>

Dubbo服务配置

# 服务端口
server.port=8081
# 服务名称
dubbo.application.name=order-service-consumer
# 配置dubbo注册中心协议类型，用户名，密码信息
dubbo.registry.address=zookeeper://user:dubboPassW0rd@10.10.6.91:2181

报错信息

2021-09-23 10:19:25.881  INFO 3200 --- [           main] org.apache.zookeeper.ZooKeeper           : Initiating client connection, **connectString=10.10.6.91:2181 sessionTimeout=60000** watcher=org.apache.curator.ConnectionState@4d3c6593
2021-09-23 10:19:25.907  INFO 3200 --- [           main] o.a.c.f.imps.CuratorFrameworkImpl        : Default schema
2021-09-23 10:19:28.910  WARN 3200 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'orderController': Unsatisfied dependency expressed through field 'orderService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userServiceImpl': Injection of @DubboReference dependencies is failed; nested exception is java.lang.IllegalStateException: zookeeper not connected
2021-09-23 10:19:28.911  INFO 3200 --- [           main] f.a.ReferenceAnnotationBeanPostProcessor : class org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor was destroying!
2021-09-23 10:19:28.914  INFO 3200 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2021-09-23 10:19:28.931  INFO 3200 --- [           main] ConditionEvaluationReportLoggingListener : Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-09-23 10:19:28.970 ERROR 3200 --- [           main] o.s.boot.SpringApplication               : Application run failedorg.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'orderController': Unsatisfied dependency expressed through field 'orderService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userServiceImpl': Injection of @DubboReference dependencies is failed; nested exception is java.lang.IllegalStateException: zookeeper not connectedat org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1413) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.8.jar:5.3.8]at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.8.jar:5.3.8]at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.2.jar:2.5.2]at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) [spring-boot-2.5.2.jar:2.5.2]at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) [spring-boot-2.5.2.jar:2.5.2]at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) [spring-boot-2.5.2.jar:2.5.2]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) [spring-boot-2.5.2.jar:2.5.2]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332) [spring-boot-2.5.2.jar:2.5.2]at com.gck.dubbo.DubboConsumerApplication.main(DubboConsumerApplication.java:16) [classes/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userServiceImpl': Injection of @DubboReference dependencies is failed; nested exception is java.lang.IllegalStateException: zookeeper not connectedat com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor.postProcessPropertyValues(AbstractAnnotationBeanPostProcessor.java:149) ~[spring-context-support-1.0.10.jar:na]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1418) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.8.jar:5.3.8]at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.3.8.jar:5.3.8]... 20 common frames omitted
Caused by: java.lang.IllegalStateException: zookeeper not connectedat org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:84) ~[dubbo-2.7.12.jar:2.7.12]at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperTransporter.createZookeeperClient(CuratorZookeeperTransporter.java:26) ~[dubbo-2.7.12.jar:2.7.12]at org.apache.dubbo.remoting.zookeeper.support.AbstractZookeeperTransporter.connect(AbstractZookeeperTransporter.java:70) ~[dubbo-2.7.12.jar:2.7.12]at org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter$Adaptive.connect(ZookeeperTransporter$Adaptive.java) ~[dubbo-2.7.12.jar:2.7.12]at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfiguration.<init>(ZookeeperDynamicConfiguration.java:66) ~[dubbo-2.7.12.jar:2.7.12]at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfigurationFactory.createDynamicConfiguration(ZookeeperDynamicConfigurationFactory.java:37) ~[dubbo-2.7.12.jar:2.7.12]at org.apache.dubbo.common.config.configcenter.AbstractDynamicConfigurationFactory.lambda$getDynamicConfiguration$0(AbstractDynamicConfigurationFactory.java:39) ~[dubbo-2.7.12.jar:2.7.12]at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660) ~[na:1.8.0_201]at org.apache.dubbo.common.config.configcenter.AbstractDynamicConfigurationFactory.getDynamicConfiguration(AbstractDynamicConfigurationFactory.java:39) ~[dubbo-2.7.12.jar:2.7.12]at org.apache.dubbo.common.config.configcenter.DynamicConfiguration.getDynamicConfiguration(DynamicConfiguration.java:224) ~[dubbo-2.7.12.jar:2.7.12]at org.apache.dubbo.config.bootstrap.DubboBootstrap.prepareEnvironment(DubboBootstrap.java:1023) ~[dubbo-2.7.12.jar:2.7.12]at org.apache.dubbo.config.bootstrap.DubboBootstrap.startConfigCenter(DubboBootstrap.java:619) ~[dubbo-2.7.12.jar:2.7.12]at org.apache.dubbo.config.bootstrap.DubboBootstrap.initialize(DubboBootstrap.java:521) ~[dubbo-2.7.12.jar:2.7.12]at org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:244) ~[dubbo-2.7.12.jar:2.7.12]at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:206) ~[dubbo-2.7.12.jar:2.7.12]at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.doGetInjectedBean(ReferenceAnnotationBeanPostProcessor.java:163) ~[dubbo-2.7.12.jar:2.7.12]at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor.getInjectedObject(AbstractAnnotationBeanPostProcessor.java:362) ~[spring-context-support-1.0.10.jar:na]at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor$AnnotatedFieldElement.inject(AbstractAnnotationBeanPostProcessor.java:542) ~[spring-context-support-1.0.10.jar:na]at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.8.jar:5.3.8]at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor.postProcessPropertyValues(AbstractAnnotationBeanPostProcessor.java:145) ~[spring-context-support-1.0.10.jar:na]... 31 common frames omitted
**Caused by: java.lang.IllegalStateException: zookeeper not connectedat org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>**(CuratorZookeeperClient.java:81) ~[dubbo-2.7.12.jar:2.7.12]... 50 common frames omitted

初始化信息

org.apache.zookeeper.ZooKeeper           : Initiating client connection, **connectString=10.10.6.91:2181 sessionTimeout=60000** watcher=org.apache.curator.ConnectionState@4d3c6593

报错的重点信息

**Caused by: java.lang.IllegalStateException: zookeeper not connectedat org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>**

报错信息跟踪

根据报错重点信息，进入【CuratorZookeeperClient.java:81】代码内部76  client = builder.build();
77  client.getConnectionStateListenable().addListener(new CuratorConnectionStateListener(url));
78  client.start();
79  boolean connected = client.blockUntilConnected(timeout, TimeUnit.MILLISECONDS);
80  if (!connected) {81      throw new IllegalStateException("zookeeper not connected");
82  }
----------------------分析------------------------
从源代码第81行可看到，抛出异常时，执行的上一段代码，即【!connected】；
从79行可看出，连接zk时，会限制连接超时时间
超时时间在65行代码中定义
65 int timeout = url.getParameter(TIMEOUT_KEY, DEFAULT_CONNECTION_TIMEOUT_MS);
在代码中可看到【DEFAULT_CONNECTION_TIMEOUT_MS】默认超时时间
超时时间定义在第39行代码处
39 protected int DEFAULT_CONNECTION_TIMEOUT_MS = 5 * 1000;
--------------------------------------------------
由以上分析得出如果在5秒内不能完成连接到zk时，会导致连接超时报错

解决思路

思路：加大超时时间，防止连接超时

dubbo.registry.timeout=20000

设置超时时间后，ZK正常连接

由于连接zk时设置了认证口令，导致连接zk超时，可适当增加zk连接时间解决

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记录 - Dubbo使用Zookeeper为注册中心添加认证口令时，连接失败的故障

记录 - Dubbo使用Zookeeper为注册中心添加认证口令时，连接失败的故障

故障现象

配置信息

Dubbo服务配置

报错信息

初始化信息

报错的重点信息

报错信息跟踪

解决思路

设置超时时间后，ZK正常连接

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