Dubbo源码本地运行demo遇到的问题
从github上拉下来的Dubbo源码,运行Dubbo项目的demo工程,报如下错误(Dubbo版本为2.7.6):
Exception in thread "main" java.lang.IllegalStateException: zookeeper not connected
at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:83)
at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperTransporter.createZookeeperClient(CuratorZookeeperTransporter.java:26)
at org.apache.dubbo.remoting.zookeeper.support.AbstractZookeeperTransporter.connect(AbstractZookeeperTransporter.java:70)
at org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter$Adaptive.connect(ZookeeperTransporter$Adaptive.java)
at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfiguration.<init>(ZookeeperDynamicConfiguration.java:70)
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:223)
at org.apache.dubbo.config.bootstrap.DubboBootstrap.prepareEnvironment(DubboBootstrap.java:857)
at org.apache.dubbo.config.bootstrap.DubboBootstrap.startConfigCenter(DubboBootstrap.java:603)
at org.apache.dubbo.config.bootstrap.DubboBootstrap.useRegistryAsConfigCenterIfNecessary(DubboBootstrap.java:671)
at org.apache.dubbo.config.bootstrap.DubboBootstrap.initialize(DubboBootstrap.java:509)
at org.apache.dubbo.config.bootstrap.DubboBootstrap.start(DubboBootstrap.java:740)
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:393)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:347)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:883)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at org.apache.dubbo.demo.provider.Application.main(Application.java:23)
Caused by: java.lang.IllegalStateException: zookeeper not connected
at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:80)
... 27 more
这是zookeeper连接超时报的异常;
根据url可以看出默认的timeout为3000;
zookeeper://192.168.211.129:2181/ConfigCenterConfig?check=true&config-file=dubbo.properties&group=dubbo&highest-priority=false&timeout=3000
那这个timeout是从哪里赋值的,还有就是是从哪里传过来的?
在org.apache.dubbo.config.ConfigCenterConfig和org.apache.dubbo.config.bootstrap.builders.ConfigCenterBuilder,分别有一个timeout的私有成员变量;
private Long timeout = 3000L;
用的是哪一个的?
在org.apache.dubbo.config.bootstrap.DubboBootstrap#initialize 初始化方法会调用useRegistryAsConfigCenterIfNecessary方法;
useRegistryAsConfigCenterIfNecessary方法有这一段逻辑:
ConfigCenterConfig对象初始化后,cc的timeout变量默认为3000L,如果registryConfig有timeout变量的赋值,就会将当前cc的timeout变量覆盖,registryConfig对应的是在<dubbo:registry/>标签添加timeout属性;
在org.apache.dubbo.config.bootstrap.DubboBootstrap#initialize 初始化方法会调用startConfigCenter方法;startConfigCenter方法用于刷新ConfigCenterConfig对象的配置,也可以在<dubbo:config-center />标签添加timeout属性;
添加如下配置:
<dubbo:config-center timeout="6000"/>
或
<dubbo:registry address="zookeeper://192.168.211.129:2181" timeout="6000"/>
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