280_Dubbo+Zookeeper

什么是分布式系统

Dubbo文档

dubbo官网：https://dubbo.apache.org/zh/

单一应用架构

垂直应用架构

分布式服务架构

流动计算架构

RPC 远程过程调用

什么是RPC

RPC基本原理

步骤解析

RPC两个核心模块：通讯，序列化

Dubbo概念

什么是dubbo

快速启动

原理

zookeeper安装

dubbo文档：https://dubbo.apache.org/zh/docs/references/registry/

zookeeper文档：https://dubbo.apache.org/zh/docs/references/registry/zookeeper/

下载zookeeper

zookeeper官网下载：https://downloads.apache.org/zookeeper/

启动zookeeper服务端

zkServer.cmd

启动报错：Error processing D:\environment\apache-zookeeper-3.7.0-bin\bin..\conf\zoo.cfg

D:\environment\apache-zookeeper-3.7.0-bin\bin>zkServer.cmd

D:\environment\apache-zookeeper-3.7.0-bin\bin>call "D:\environment\Java\jdk1.8"\bin\java "-Dzookeeper.log.dir=D:\environment\apache-zookeepe
r-3.7.0-bin\bin\..\logs" "-Dzookeeper.root.logger=INFO,CONSOLE" "-Dzookeeper.log.file=zookeeper-Administrator-server-L87Y12K91TH8M2R.log" "-
XX:+HeapDumpOnOutOfMemoryError" "-XX:OnOutOfMemoryError=cmd /c taskkill /pid %%p /t /f" -cp "D:\environment\apache-zookeeper-3.7.0-bin\bin\.
.\build\classes;D:\environment\apache-zookeeper-3.7.0-bin\bin\..\build\lib\*;D:\environment\apache-zookeeper-3.7.0-bin\bin\..\*;D:\environme
nt\apache-zookeeper-3.7.0-bin\bin\..\lib\*;D:\environment\apache-zookeeper-3.7.0-bin\bin\..\conf" org.apache.zookeeper.server.quorum.QuorumP
eerMain "D:\environment\apache-zookeeper-3.7.0-bin\bin\..\conf\zoo.cfg"
2022-01-26 23:51:40,368 [myid:] - INFO  [main:QuorumPeerConfig@174] - Reading configuration from: D:\environment\apache-zookeeper-3.7.0-bin\
bin\..\conf\zoo.cfg
2022-01-26 23:51:40,393 [myid:] - ERROR [main:QuorumPeerMain@99] - Invalid config, exiting abnormally
org.apache.zookeeper.server.quorum.QuorumPeerConfig$ConfigException: Error processing D:\environment\apache-zookeeper-3.7.0-bin\bin\..\conf\
zoo.cfg
        at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:198)
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:125)
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:91)
Caused by: java.lang.IllegalArgumentException: D:\environment\apache-zookeeper-3.7.0-bin\bin\..\conf\zoo.cfg file is missing
        at org.apache.zookeeper.server.util.VerifyingFileFactory.doFailForNonExistingPath(VerifyingFileFactory.java:54)
        at org.apache.zookeeper.server.util.VerifyingFileFactory.validate(VerifyingFileFactory.java:47)
        at org.apache.zookeeper.server.util.VerifyingFileFactory.create(VerifyingFileFactory.java:39)
        at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:180)
        ... 2 more
Invalid config, exiting abnormally
2022-01-26 23:51:40,402 [myid:] - INFO  [main:ZKAuditProvider@42] - ZooKeeper audit is disabled.
2022-01-26 23:51:40,490 [myid:] - ERROR [main:ServiceUtils@42] - Exiting JVM with code 2

D:\environment\apache-zookeeper-3.7.0-bin\bin>endlocal

D:\environment\apache-zookeeper-3.7.0-bin\bin>

原因：没有zoo.cfg文件
解决：复制zoo_sample.cfg为zoo.cfg文件

再次启动，启动成功

测试

启动zookeeper客户端

zkCli.cmd

启动成功

列出所有节点 ls /

[zk: localhost:2181(CONNECTED) 0] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 1]

创建节点，获取节点的值

[zk: localhost:2181(CONNECTED) 1] create -e /user 123
Created /user
[zk: localhost:2181(CONNECTED) 2] get /user
123
[zk: localhost:2181(CONNECTED) 3] ls /
[user, zookeeper]
[zk: localhost:2181(CONNECTED) 4] get /zookeeper

[zk: localhost:2181(CONNECTED) 5]