最近对Nacos源码比较感兴趣，个人是个好奇宝宝，特别想了解一下Nacos这个阿里开源的分布式服务注册与发现及配置管理中间件内部到底是个啥样子，于是就想着自己源码编译，debug走一下试试。可惜上来就遇到问题了：
Nacos启动一直停留在这个界面无法正常启动，个人使用的是外置Mysql数据源。
再看一下Nacos启动日志，发现一下报错：
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:156)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:312)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204)
at com.alibaba.nacos.Nacos.main(Nacos.java:35)
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:124)
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86)
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:416)
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:180)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153)
... 8 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'trafficReviseFilterRegistration' defined in class path resource [com/alibaba/nacos/naming/web/NamingConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.web.servlet.FilterRegistrationBean]: Factory method 'trafficReviseFilterRegistration' threw exception; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'trafficReviseFilter': Unsatisfied dependency expressed through field 'serverStatusManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serverStatusManager': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'consistencyDelegate' defined in file [/Users/menghaowu/github/nacos/naming/target/classes/com/alibaba/nacos/naming/consistency/DelegateConsistencyServiceImpl.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'persistentConsistencyServiceDelegate' defined in file [/Users/menghaowu/github/nacos/naming/target/classes/com/alibaba/nacos/naming/consistency/persistent/PersistentConsistencyServiceDelegateImpl.class]: Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.alibaba.nacos.naming.consistency.persistent.PersistentConsistencyServiceDelegateImpl]: Constructor threw exception; nested exception is java.lang.IllegalStateException: Fail to init node, please see the logs to find the reason.
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:627)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:456)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1318)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1158)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:554)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:514)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:321)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:319)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:204)
at org.springframework.boot.web.servlet.ServletContextInitializerBeans.getOrderedBeansOfType(ServletContextInitializerBeans.java:211)
at org.springframework.boot.web.servlet.ServletContextInitializerBeans.getOrderedBeansOfType(ServletContextInitializerBeans.java:202)
at org.springframework.boot.web.servlet.ServletContextInitializerBeans.addServletContextInitializerBeans(ServletContextInitializerBeans.java:96)
at org.springframework.boot.web.servlet.ServletContextInitializerBeans.<init>(ServletContextInitializerBeans.java:85)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getServletContextInitializerBeans(ServletWebServerApplicationContext.java:253)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.selfInitialize(ServletWebServerApplicationContext.java:227)
at org.springframework.boot.web.embedded.tomcat.TomcatStarter.onStartup(TomcatStarter.java:53)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5128)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)
at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
at java.util.concurrent.FutureTask.run(FutureTask.java)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:843)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)
at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
at java.util.concurrent.FutureTask.run(FutureTask.java)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Tomcat.start(Tomcat.java:486)
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:105)
... 13 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.web.servlet.FilterRegistrationBean]: Factory method 'trafficReviseFilterRegistration' threw exception; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'trafficReviseFilter': Unsatisfied dependency expressed through field 'serverStatusManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serverStatusManager': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'consistencyDelegate' defined in file [/Users/menghaowu/github/nacos/naming/target/classes/com/alibaba/nacos/naming/consistency/DelegateConsistencyServiceImpl.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'persistentConsistencyServiceDelegate' defined in file [/Users/menghaowu/github/nacos/naming/target/classes/com/alibaba/nacos/naming/consistency/persistent/PersistentConsistencyServiceDelegateImpl.class]: Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.alibaba.nacos.naming.consistency.persistent.PersistentConsistencyServiceDelegateImpl]: Constructor threw exception; nested exception is java.lang.IllegalStateException: Fail to init node, please see the logs to find the reason.
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622)
... 55 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'trafficReviseFilter': Unsatisfied dependency expressed through field 'serverStatusManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serverStatusManager': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'consistencyDelegate' defined in file [/Users/menghaowu/github/nacos/naming/target/classes/com/alibaba/nacos/naming/consistency/DelegateConsistencyServiceImpl.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'persistentConsistencyServiceDelegate' defined in file [/Users/menghaowu/github/nacos/naming/target/classes/com/alibaba/nacos/naming/consistency/persistent/PersistentConsistencyServiceDelegateImpl.class]: Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.alibaba.nacos.naming.consistency.persistent.PersistentConsistencyServiceDelegateImpl]: Constructor threw exception; nested exception is java.lang.IllegalStateException: Fail to init node, please see the logs to find the reason.
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:598)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:376)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1402)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:591)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:514)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:321)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:319)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.resolveBeanReference(ConfigurationClassEnhancer.java:394)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:366)
at com.alibaba.nacos.naming.web.NamingConfig$$EnhancerBySpringCGLIB$$2ef3eaff.trafficReviseFilter(<generated>)
at com.alibaba.nacos.naming.web.NamingConfig.trafficReviseFilterRegistration(NamingConfig.java:44)
at com.alibaba.nacos.naming.web.NamingConfig$$EnhancerBySpringCGLIB$$2ef3eaff.CGLIB$trafficReviseFilterRegistration$0(<generated>)
at com.alibaba.nacos.naming.web.NamingConfig$$EnhancerBySpringCGLIB$$2ef3eaff$$FastClassBySpringCGLIB$$d2c42aa4.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363)
at com.alibaba.nacos.naming.web.NamingConfig$$EnhancerBySpringCGLIB$$2ef3eaff.trafficReviseFilterRegistration(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
... 56 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serverStatusManager': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'consistencyDelegate' defined in file [/Users/menghaowu/github/nacos/naming/target/classes/com/alibaba/nacos/naming/consistency/DelegateConsistencyServiceImpl.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'persistentConsistencyServiceDelegate' defined in file [/Users/menghaowu/github/nacos/naming/target/classes/com/alibaba/nacos/naming/consistency/persistent/PersistentConsistencyServiceDelegateImpl.class]: Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.alibaba.nacos.naming.consistency.persistent.PersistentConsistencyServiceDelegateImpl]: Constructor threw exception; nested exception is java.lang.IllegalStateException: Fail to init node, please see the logs to find the reason.
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:325)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1402)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:591)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:514)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:321)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:319)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1276)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1196)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:595)
... 79 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'consistencyDelegate' defined in file [/Users/menghaowu/github/nacos/naming/target/classes/com/alibaba/nacos/naming/consistency/DelegateConsistencyServiceImpl.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'persistentConsistencyServiceDelegate' defined in file [/Users/menghaowu/github/nacos/naming/target/classes/com/alibaba/nacos/naming/consistency/persistent/PersistentConsistencyServiceDelegateImpl.class]: Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.alibaba.nacos.naming.consistency.persistent.PersistentConsistencyServiceDelegateImpl]: Constructor threw exception; nested exception is java.lang.IllegalStateException: Fail to init node, please see the logs to find the reason.
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:769)
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:218)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1338)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1185)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:554)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:514)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:321)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:319)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:204)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeanByName(AbstractAutowireCapableBeanFactory.java:451)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:527)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:497)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:637)
at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:180)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:322)
... 90 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'persistentConsistencyServiceDelegate' defined in file [/Users/menghaowu/github/nacos/naming/target/classes/com/alibaba/nacos/naming/consistency/persistent/PersistentConsistencyServiceDelegateImpl.class]: Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.alibaba.nacos.naming.consistency.persistent.PersistentConsistencyServiceDelegateImpl]: Constructor threw exception; nested exception is java.lang.IllegalStateException: Fail to init node, please see the logs to find the reason.
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:304)
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:285)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1338)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1185)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:554)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:514)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:321)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:319)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1276)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1196)
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:857)
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:760)
... 106 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.alibaba.nacos.naming.consistency.persistent.PersistentConsistencyServiceDelegateImpl]: Constructor threw exception; nested exception is java.lang.IllegalStateException: Fail to init node, please see the logs to find the reason.
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:187)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:117)
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:300)
... 120 common frames omitted
Caused by: java.lang.IllegalStateException: Fail to init node, please see the logs to find the reason.
at com.alipay.sofa.jraft.RaftServiceFactory.createAndInitRaftNode(RaftServiceFactory.java:48)
at com.alipay.sofa.jraft.RaftGroupService.start(RaftGroupService.java:129)
at com.alibaba.nacos.core.distributed.raft.JRaftServer.createMultiRaftGroup(JRaftServer.java:268)
at com.alibaba.nacos.core.distributed.raft.JRaftProtocol.addRequestProcessors(JRaftProtocol.java:163)
at com.alibaba.nacos.naming.consistency.persistent.impl.PersistentServiceProcessor.afterConstruct(PersistentServiceProcessor.java:68)
at com.alibaba.nacos.naming.consistency.persistent.PersistentConsistencyServiceDelegateImpl.createNewPersistentServiceProcessor(PersistentConsistencyServiceDelegateImpl.java:101)
at com.alibaba.nacos.naming.consistency.persistent.PersistentConsistencyServiceDelegateImpl.<init>(PersistentConsistencyServiceDelegateImpl.java:52)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:175)
... 122 common frames omitted通过stackTrace我们可以定位，错误发送在 com.alipay.sofa.jraft.RaftServiceFactory.createAndInitRaftNode(RaftServiceFactory.java:48)这个地方
public static Node createAndInitRaftNode(String groupId, PeerId serverId, NodeOptions opts) {
Node ret = createRaftNode(groupId, serverId);
if (!ret.init(opts)) {
throw new IllegalStateException("Fail to init node, please see the logs to find the reason.");
} else {
return ret;
}
}也就是说，Nacos在创建jRaft数据节点的时候发生了错误，经过调试进一步定位我们可以发现最终的报错点位于 org.rocksdb.RocksDB.open(RocksDB.java:146)处
public static RocksDB open(DBOptions var0, String var1, List<ColumnFamilyDescriptor> var2, List<ColumnFamilyHandle> var3) throws RocksDBException {
byte[][] var4 = new byte[var2.size()][];
long[] var5 = new long[var2.size()];
for(int var6 = 0; var6 < var2.size(); ++var6) {
ColumnFamilyDescriptor var7 = (ColumnFamilyDescriptor)var2.get(var6);
var4[var6] = var7.columnFamilyName();
var5[var6] = var7.columnFamilyOptions().nativeHandle_;
}
long[] var9 = open(var0.nativeHandle_, var1, var4, var5); // 这里
RocksDB var10 = new RocksDB(var9[0]);
var10.storeOptionsInstance(var0);
for(int var8 = 1; var8 < var9.length; ++var8) {
var3.add(new ColumnFamilyHandle(var10, var9[var8]));
}
return var10;
}那么最终原因我们可以找到，jRaft的日志记录使用的是RocksDB框架进行的，该框架是一个居于文件系统的列存储型日志数据库，它在初始化时需要指定数据文件目录。当我们默认单机启动多个Nacos实例时，RocksDB所默认使用的数据目录都是同一个，此时就会报错。当我们debug时，修改了RocksDB默认数据目录后，实例便能启动。
顺带提一句，这也是为什么第一个启动的节点不会报错的原因。
下面是github中拿到的RocksDB.open方法相关的源码：
https://github.com/facebook/rocksdb/blob/master/db/db_impl/db_impl_open.cc
