#最最最重要的問題
版本問題
當Maven中有多個引用,包與包之間的引用衝突,包與使用的軟件之間的衝突
##細節問題
zooKeeper版本與引用的包的版本不對應
Q:
org.apache.zookeeper.KeeperException$UnimplementedException: KeeperErrorCode = Unimplemented for…
A:
spring-cloud-starter-zookeeper-discovery 2.0.0依賴的curator版本爲4.0.1;
Curator 4.0 has a hard dependency on ZooKeeper 3.5.x
If you are using ZooKeeper 3.5.x there’s nothing additional to do - just use Curator 4.0
參考: https://blog.csdn.net/forget_me_not1991/article/details/80902055
ZooKeeper中節點路徑是唯一的,該路徑下已有節點時,繼續往當前路徑上新建節點就會報這個錯
Q:
KeeperErrorCode = NoNode for …
A:
關閉ZooKeeper,將zoo.cfg裏的自己設定的dataDir和dataLogDir路徑下的version-2文件夾,然後重啓即可。
服務註冊中心使用ZooKeeper:服務節點無法註冊到zookeeper
Q: 服務註冊中心用eureka換爲ZooKeeper,zookeeper正常啓動且telnet檢測正常按照教程:
添加
@EnableDiscoveryClient
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
</dependency>
spring:
cloud:
zookeeper:
connect-string: localhost:2181
discovery:
//register: true
//enabled: true
root: /cloud
註釋掉
@EnableEurekaClient
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka-server</artifactId>
</dependency>
eureka:
instance:
hostname: localhost
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
啓動不報錯,但是服務節點無法註冊到zookeeper
A:
檢查依賴中有無spring-cloud-starter包:
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter</artifactId>
</dependency>
注意
spring.cloud.zookeeper.discovery的register屬性:
默認爲true,設置爲false時,不去註冊
遺留問題:
- 不添加@EnableEurekaClient和@EnableDiscoveryClient都可以註冊成功
- zookeeper會報KeeperErrorCode = NoNode for …