#最最最重要的问题
版本问题
当Maven中有多个引用,包与包之间的引用冲突,包与使用的软件之间的冲突
##细节问题
zooKeeper版本与引用的包的版本不对应
Q:
org.apache.zookeeper.KeeperException$UnimplementedException: KeeperErrorCode = Unimplemented for…
A:
spring-cloud-starter-zookeeper-discovery 2.0.0依赖的curator版本为4.0.1;
Curator 4.0 has a hard dependency on ZooKeeper 3.5.x
If you are using ZooKeeper 3.5.x there’s nothing additional to do - just use Curator 4.0
参考: https://blog.csdn.net/forget_me_not1991/article/details/80902055
ZooKeeper中节点路径是唯一的,该路径下已有节点时,继续往当前路径上新建节点就会报这个错
Q:
KeeperErrorCode = NoNode for …
A:
关闭ZooKeeper,将zoo.cfg里的自己设定的dataDir和dataLogDir路径下的version-2文件夹,然后重启即可。
服务注册中心使用ZooKeeper:服务节点无法注册到zookeeper
Q: 服务注册中心用eureka换为ZooKeeper,zookeeper正常启动且telnet检测正常按照教程:
添加
@EnableDiscoveryClient
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
</dependency>
spring:
cloud:
zookeeper:
connect-string: localhost:2181
discovery:
//register: true
//enabled: true
root: /cloud
注释掉
@EnableEurekaClient
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka-server</artifactId>
</dependency>
eureka:
instance:
hostname: localhost
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
启动不报错,但是服务节点无法注册到zookeeper
A:
检查依赖中有无spring-cloud-starter包:
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter</artifactId>
</dependency>
注意
spring.cloud.zookeeper.discovery的register属性:
默认为true,设置为false时,不去注册
遗留问题:
- 不添加@EnableEurekaClient和@EnableDiscoveryClient都可以注册成功
- zookeeper会报KeeperErrorCode = NoNode for …