Dubbo新版本zk注册中心连接问题 |
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目录
一、使用zkclient作为zk连接客户端问题1、Maven依赖如下2、服务提供者配置文件3、启动服务提供者4、原因分析5、解决办法(1)降低dubbo版本(2)添加ZookeeperTransporter拓展实现
二、使用curator作为zk连接客户端版本问题1、Maven依赖如下2、服务提供者配置文件3、启动服务提供者4、curator作为zk连接客户端可行依赖
三、总结
一、使用zkclient作为zk连接客户端问题
1、Maven依赖如下
org.apache.dubbo
dubbo
2.7.8
org.apache.zookeeper
zookeeper
3.4.14
com.101tec
zkclient
0.11
org.apache.zookeeper
zookeeper
我部署的zookeeper版本为3.4.14,因此客户端版本也是选用的3.4.14,dubbo选用的是目前新版本。 2、服务提供者配置文件 3、启动服务提供者 public class XmlDubboProvider { public static void main(String[] args) throws IOException { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:dubbo/dubbo-provider.xml"); context.start(); System.in.read(); } }启动服务提供者后报错了,堆栈信息如下: Exception in thread "main" java.lang.IllegalStateException: No such extension org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter by name zkclient at org.apache.dubbo.common.extension.ExtensionLoader.findException(ExtensionLoader.java:623) at org.apache.dubbo.common.extension.ExtensionLoader.createExtension(ExtensionLoader.java:630) at org.apache.dubbo.common.extension.ExtensionLoader.getExtension(ExtensionLoader.java:429) at org.apache.dubbo.common.extension.ExtensionLoader.getExtension(ExtensionLoader.java:413) at org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter$Adaptive.connect(ZookeeperTransporter$Adaptive.java) at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfiguration.(ZookeeperDynamicConfiguration.java:56) at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfigurationFactory.createDynamicConfiguration(ZookeeperDynamicConfigurationFactory.java:37) at org.apache.dubbo.common.config.configcenter.AbstractDynamicConfigurationFactory.lambda$getDynamicConfiguration$0(AbstractDynamicConfigurationFactory.java:39) at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660) at org.apache.dubbo.common.config.configcenter.AbstractDynamicConfigurationFactory.getDynamicConfiguration(AbstractDynamicConfigurationFactory.java:39) at org.apache.dubbo.common.config.configcenter.DynamicConfiguration.getDynamicConfiguration(DynamicConfiguration.java:224) at org.apache.dubbo.config.bootstrap.DubboBootstrap.prepareEnvironment(DubboBootstrap.java:1034) at org.apache.dubbo.config.bootstrap.DubboBootstrap.startConfigCenter(DubboBootstrap.java:623) at org.apache.dubbo.config.bootstrap.DubboBootstrap.initialize(DubboBootstrap.java:521) at org.apache.dubbo.config.bootstrap.DubboBootstrap.start(DubboBootstrap.java:896) at org.apache.dubbo.config.spring.context.DubboBootstrapApplicationListener.onContextRefreshedEvent(DubboBootstrapApplicationListener.java:59) at org.apache.dubbo.config.spring.context.DubboBootstrapApplicationListener.onApplicationContextEvent(DubboBootstrapApplicationListener.java:52) at org.apache.dubbo.config.spring.context.OneTimeExecutionApplicationContextEventListener.onApplicationEvent(OneTimeExecutionApplicationContextEventListener.java:40) at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:404) at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:361) at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:898) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:554) at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:144) at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:85) at com.netease.dubbo.provider.XmlDubboProvider.main(XmlDubboProvider.java:14) 4、原因分析Exception in thread "main" java.lang.IllegalStateException: No such extension org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter by name zkclient 看异常信息第一行,提示的是没有名为zkclient的拓展信息,dubbo官方文档有关于拓展点加载和SPI实现的说明,如下: 既然是拓展点,那么根据dubbo官方文档说明在引入的dubbo依赖下的META-INF/dubbo目录肯定会有相关拓展实现类信息,打开duboo依赖目录可以看到很多拓展点信息,internel目录下的都为dubbo自带的,如下: 如果我们硬是要用zkclient作为zk连接客户端,也是可以的,最简单的办法把dubbo版本降到2.7.0,因为2.7.0版本内置了zkclient的拓展实现,如下: 降低dubbo依赖,重新启动程序,成功连接到zk。 org.apache.dubbo dubbo 2.7.0 org.apache.zookeeper zookeeper 3.4.14 com.101tec zkclient 0.11 org.apache.zookeeper zookeeper (2)添加ZookeeperTransporter拓展实现从上面解决方案截图中可以看看到,在apache dubbo 2.7.0中是有zkclient实现源码的。如果我们要在dubbo最新版本中使用zkclient,可以把代码搬过去,依葫芦画瓢,在类路径下新建META-INF/dubbo目录。然后新建一个文件,文件名为ZookeeperTransporter的全限定类名,最后添加客户端名称和实现类映射,如下: curator版本为当前最新版5.1.0,dubbo也是当前最新版本2.7.8。 2、服务提供者配置文件dubbo新版本默认使用curator作为zk连接客户端,配置文件内容如下: 3、启动服务提供者 Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/zookeeper/admin/ZooKeeperAdmin at org.apache.curator.framework.CuratorFrameworkFactory.(CuratorFrameworkFactory.java:65) at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.(CuratorZookeeperClient.java:66) at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperTransporter.createZookeeperClient(CuratorZookeeperTransporter.java:26) at org.apache.dubbo.remoting.zookeeper.support.AbstractZookeeperTransporter.connect(AbstractZookeeperTransporter.java:70)一启动就翻车了,报的是org.apache.zookeeper.admin.ZooKeeperAdmin类不存在,想了一想,总觉得是curator依赖有点问题。于是乎跑到curator官网瞧了瞧。 呵呵,又翻车了,这次报的不是org.apache.zookeeper.admin.ZooKeeperAdmin不存在了,而是zk连不上。不是说好的curator 4.2.0版本兼容zk 3.4.x的版本吗,难道是zookeeper版本有问题吗。话不多说,把zk依赖版本降到3.4.12,重新启动程序,结果如下: 2020-10-23 23:05:52.959 INFO [main-SendThread(localhsot:2181)] [org.apache.zookeeper.ClientCnxn] - Opening socket connection to server localhsot/localhsot:2181. Will not attempt to authenticate using SASL (unknown error) 2020-10-23 23:05:52.961 INFO [main] [org.apache.curator.framework.imps.CuratorFrameworkImpl] - Default schema 2020-10-23 23:05:52.992 INFO [main-SendThread(localhsot:2181)] [org.apache.zookeeper.ClientCnxn] - Socket connection established to localhsot/localhsot:2181, initiating session 2020-10-23 23:05:53.084 INFO [main-SendThread(localhsot:2181)] [org.apache.zookeeper.ClientCnxn] - Session establishment complete on server localhsot/localhsot:2181, sessionid = 0x10634c6160d017d, negotiated timeout = 40000 2020-10-23 23:05:53.093 INFO [main-EventThread] [org.apache.curator.framework.state.ConnectionStateManager] - State change: CONNECTED终于可以了,看来官方文档也是坑多多,无论是dubbo还是curator,版本问题都没写清楚。 4、curator作为zk连接客户端可行依赖 org.apache.dubbo dubbo 2.7.8 org.apache.zookeeper zookeeper 3.4.12 org.apache.curator curator-recipes 4.2.0 org.apache.zookeeper zookeeper 三、总结新版本dubbo已经不使用zkclient最为zk连接客户端,默认使用curator,这点在dubbo官方文档上没有写清楚,可能是文档没更新的原因,官方文档如下: |
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