准备
- MySQL 5.6
- Canal 1.0.24
- Kafka 1.0.0
- Zookeeper 3.4.11
- Spring Boot
- JDK 8
- IntelliJ Idea 14.1.7
背景
在实际工作中，多个系统使用相同的用户等业务数据是常有的事情。随着需求的迭代式开发，系统的增加。系统的业务数据变更通知逐渐成为痛点，将数据变更逐一通知到其他系统在系统少的时候勉强可以接受，但是系统变多，需要通知的业务数据增多再使用此类的方式无疑是得不偿失的，且极不易维护，耦合性太强，牵一发而动全身。此时，引入中间件无疑是一种明智的选择。将系统从繁杂的通知中解脱出来，把通知这件事交给中间件来做。而这是基于业务操作最终会落实到数据库中，这也是本文方案可行的前提。
架构图
image
实现
Canal Server搭建
MySQL配置
- 进入C:\Program Files\MySQL\MySQL Server 5.6目录
- 编辑my.ini文件（按需修改），打开mysql bin log功能，如下
[mysqld]
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
# These are commonly set, remove the # and set as required.
basedir = C:\Program Files\MySQL\MySQL Server 5.6
datadir = C:\Program Files\MySQL\MySQL Server 5.6\data
# port = .....
# server_id = .....
log-bin=mysql-bin #添加这一行即可
#选择row模式
binlog-format=ROW
#配置mysql replaction需要定义，不能和canal的slaveId重复
server_id=1
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
- canal的原理是模拟自己为mysql slave，所以这里一定需要拥有做为mysql slave的相关权限（canal server配置需要用到此用户）
CREATE USER canal IDENTIFIED BY 'canal';
GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'canal'@'%';
-- GRANT ALL PRIVILEGES ON *.* TO 'canal'@'%' ;
FLUSH PRIVILEGES;
- 重启mysql server
- 查看bin log状态
show binlog events;
image
- 获取canalserver（https://github.com/alibaba/canal/releases/download/canal-1.0.24/canal.deployer-1.0.24.tar.gz）
-
修改canal server配置
- 进入D:\MySQL_Sync_Component\canal.deployer-1.0.24\conf\example目录
- 修改canal.properties文件
- 修改instance.properties文件
#canal.properties
##配置zookeeper地址
canal.zkServers=127.0.0.1:2181
#################################################
#instance.properties
## mysql serverId
canal.instance.mysql.slaveId = 1234
# position info,需要改成自己的数据库信息
canal.instance.master.address = 127.0.0.1:3306
canal.instance.master.journal.name =
canal.instance.master.position =
canal.instance.master.timestamp =
#canal.instance.standby.address =
#canal.instance.standby.journal.name =
#canal.instance.standby.position =
#canal.instance.standby.timestamp =
# username/password,需要改成自己的数据库信息
canal.instance.dbUsername = canal
canal.instance.dbPassword = canal
canal.instance.defaultDatabaseName =
canal.instance.connectionCharset = UTF-8
# table regex
canal.instance.filter.regex = .*\\..*
# table black regex
canal.instance.filter.black.regex =
#################################################
-
启动canal server
- 进入D:\MySQL_Sync_Component\canal.deployer-1.0.24\bin目录
- 运行startup.bat
-
查看canal server日志
- D:\MySQL_Sync_Component\canal.deployer-1.0.24\logs\canal\canal.log
- D:\MySQL_Sync_Component\canal.deployer-1.0.24\logs\example\example.log
canal.log
2017-11-24 17:55:32.550 [main] INFO com.alibaba.otter.canal.deployer.CanalLauncher - ## start the canal server.
2017-11-24 17:55:32.770 [main] INFO com.alibaba.otter.canal.deployer.CanalController - ## start the canal server[192.168.191.1:11111]
2017-11-24 17:55:34.503 [main] INFO com.alibaba.otter.canal.deployer.CanalLauncher - ## the canal server is running now ......
example.log
2017-11-24 17:55:33.202 [main] INFO c.a.o.c.i.spring.support.PropertyPlaceholderConfigurer - Loading properties file from class path resource [canal.properties]
2017-11-24 17:55:33.209 [main] INFO c.a.o.c.i.spring.support.PropertyPlaceholderConfigurer - Loading properties file from class path resource [example/instance.properties]
2017-11-24 17:55:33.343 [main] WARN org.springframework.beans.TypeConverterDelegate - PropertyEditor [com.sun.beans.editors.EnumEditor] found through deprecated global PropertyEditorManager fallback - consider using a more isolated form of registration, e.g. on the BeanWrapper/BeanFactory!
2017-11-24 17:55:33.471 [main] INFO c.a.otter.canal.instance.spring.CanalInstanceWithSpring - start CannalInstance for 1-example
2017-11-24 17:55:33.647 [main] INFO c.a.otter.canal.instance.core.AbstractCanalInstance - start successful....
2017-11-24 17:55:33.896 [destination = example , address = /127.0.0.1:3306 , EventParser] WARN c.a.otter.canal.parse.inbound.mysql.MysqlEventParser - prepare to find start position just show master status
Zookeeper Server搭建
- 获取并配置zookeeper（http://www.apache.org/dyn/closer.cgi/zookeeper/）
- 复制D:\MySQL_Sync_Component\zookeeper\zookeeper-3.4.11\conf\zoo_sample.cfg并重命名为zoo.cfg,zookeeper读取的是zoo.cfg这个配置文件
- 启动zookeeper，进入D:\MySQL_Sync_Component\zookeeper\zookeeper-3.4.11\bin，执行
zkServer.cmd
Kafka Server搭建
- 获取Kafaka Server（https://www.apache.org/dyn/closer.cgi?path=/kafka/1.0.0/kafka_2.11-1.0.0.tgz）
-
配置Kafka Server
- 修改D:\MySQL_Sync_Component\kafka\kafka_2.12-1.0.0\config\server.properties
#server.properteis#
#配置zookeeper连接地址
zookeeper.connect=localhost:2181
- 启动Kafka服务，进入D:\MySQL_Sync_Component\kafka\kafka_2.12-1.0.0\bin\windows，执行
kafka-server-start.bat D:\MySQL_Sync_Component\kafka\kafka_2.12-1.0.0\bin\conf\server.properties
- 创建topic，进入D:\MySQL_Sync_Component\kafka\kafka_2.12-1.0.0\bin\windows，执行
kafka-topics.bat --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic testbinlog
- 启动一个kafka生产者，用于测试kafka是否启动成功。执行
kafka-console-producer.bat --broker-list localhost:9092 --topic testbinlog
- 启动一个kafka消费者，接收生产者发送的消息。测试通过，consumer可以收到producer发送的消息。执行
kafka-console-consumer.bat --bootstrap-server localhost:9092 --topic testbinlog --from-beginning
创建Spring Boot应用
- 新建一个Spring Boot应用（http://projects.spring.io/spring-boot/#quick-start）
- pom文件增加kafka依赖
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
</dependency>
- 编写kafka生产者和消费者代码，代码在（https://github.com/hxysea/mynote/tree/master/%E9%A1%B9%E7%9B%AE%E7%BB%8F%E9%AA%8C/Mysql%E6%95%B0%E6%8D%AE%E5%90%8C%E6%AD%A5%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88/DataSyncApplication）
- 启动应用
总结
如上，已经介绍了整个解决方案所需组件的配置及启动方法。文中的解决方案用于业务数据通知或者缓存刷新等场景。本文除了提供一种业务场景的解决方案以外，更多的是希望读者可以从中领会到各组件的设计思想及其优劣势。除了可以熟练配置及使用各组件，这些组件的编码思想及设计模式更是我辈学习的典范。对于各组件的使用，最好先去阅读官方文档，然后参考相关博客，再编码实践，最后阅读下源码，达到融会贯通的境界。
PS:
示例代码github地址：
https://github.com/hxysea/mynote/tree/master/%E9%A1%B9%E7%9B%AE%E7%BB%8F%E9%AA%8C/Mysql%E6%95%B0%E6%8D%AE%E5%90%8C%E6%AD%A5%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88
参考文档
https://github.com/alibaba/canal/wiki
https://docs.spring.io/spring-boot/docs/1.5.8.RELEASE/reference/htmlsingle/
