SpringBoot canal数据同步解决方案
一、需求
微服务多数据库情况下可以使用canal替代触发器，canal是应阿里巴巴跨机房同步的业务需求而提出的，canal基于数据库的日志解析，获取变更进行增量订阅&消费的业务。无论是canal实验需要还是为了增量备份、主从复制和恢复，都是需要开启mysql-binlog日志，数据目录设置到不同的磁盘分区可以降低io等待。
canal 工作原理
canal 模拟 MySQL slave 的交互协议，伪装自己为 MySQL slave ，向 MySQL master 发送dump 协议
MySQL master 收到 dump 请求，开始推送 binary log 给 slave (即 canal )
canal 解析 binary log 对象(原始为 byte 流)
1、登录mysql查看是否开启binlog，标红的log_bin默认是OFF关
mysql> show variables like ‘log_%’;
+—————————————-+——————————————————-+
| Variable_name | Value |
+—————————————-+——————————————————-+
| **log_bin | OFF** |
| log_bin_basename | |
| log_bin_index | |
| log_bin_trust_function_creators | OFF |
| log_bin_use_v1_row_events | OFF |
| log_builtin_as_identified_by_password | OFF |
| log_error | F:\tools\mysql-5.7.28-winx64\Data\DESKTOP-C1LU9IQ.err |
| log_error_verbosity | 3 |
| log_output | FILE |
| log_queries_not_using_indexes | OFF |
| log_slave_updates | OFF |
| log_slow_admin_statements | OFF |
| log_slow_slave_statements | OFF |
| log_statements_unsafe_for_binlog | ON |
| log_syslog | ON |
| log_syslog_tag | |
| log_throttle_queries_not_using_indexes | 0 |
| log_timestamps | UTC |
| log_warnings | 2 |
+—————————————-+——————————————————-+
19 rows in set (0.03 sec)
2、编辑配置文件
[mysqld]
# 设置3306端口
port=3306
# 设置mysql的安装目录，按照个人的实际需要改
basedir=F:\\tools\\mysql-5.7.28-winx64 # 切记此处一定要用双斜杠\\，单斜杠我这里会出错，不过看别人的教程，有的是单斜杠。自己尝试吧
# 设置mysql数据库的数据的存放目录
datadir=F:\\tools\\mysql-5.7.28-winx64\\Data # 此处同上
# 允许最大连接数
max_connections=200
# 允许连接失败的次数。这是为了防止有人从该主机试图攻击数据库系统
max_connect_errors=10
# 服务端使用的字符集默认为UTF8
character-set-server=utf8
# 创建新表时将使用的默认存储引擎
default-storage-engine=INNODB
# 默认使用“mysql_native_password”插件认证
default_authentication_plugin=mysql_native_password
lower_case_table_names=2
sql_mode = STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
max_connections=1000
#实验重点配置
# 开启 binlog
log-bin=mysql-bin
# 选择 ROW 模式
binlog-format=ROW
# 配置 MySQL replaction 需要定义，不要和 canal 的 slaveId 重复
server_id=1
[mysql]
# 设置mysql客户端默认字符集
default-character-set=utf8
[client]
# 设置mysql客户端连接服务端时默认使用的端口
port=3306
default-character-set=utf8
3、创建MySQL slave 的权限canal账户并且进行远程连接授权
CREATE USER canal IDENTIFIED BY ‘canal’;
GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO ‘canal’@’%’;
— GRANT ALL PRIVILEGES ON *.* TO ‘canal’@’%’ ;
FLUSH PRIVILEGES;
4、记得重启mysql服务
Linux：
systemctl restart mysqld
Window:
net stop mysql;
net start mysql;
1、修改配置conf/example/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 = .\*\\\\..\*
2、通过启动脚本运行：sh bin/startup.sh
3、查看 server 日志和instance 的日志
$ tail -f logs/canal/canal.log
2020-05-28 13:52:03.037 [main] INFO com.alibaba.otter.canal.deployer.CanalLauncher – ## set default uncaught exception handler
2020-05-28 13:52:03.065 [main] INFO com.alibaba.otter.canal.deployer.CanalLauncher – ## load canal configurations
2020-05-28 13:52:03.072 [main] INFO com.alibaba.otter.canal.deployer.CanalStarter – ## start the canal server.
2020-05-28 13:52:03.444 [main] INFO com.alibaba.otter.canal.deployer.CanalController – ## start the canal server[172.36.58.25(172.36.58.25):11111]
2020-05-28 13:52:04.604 [main] INFO com.alibaba.otter.canal.deployer.CanalStarter – ## the canal server is running now ……
$ tail -f logs/example/example.log
2020-05-28 13:52:04.238 [main] WARN o.s.beans.GenericTypeAwarePropertyDescriptor – Invalid JavaBean property ‘connectionCharset’ being accessed! Ambiguous write methods found next to actually used [public void com.alibaba.otter.canal.parse.inbound.mysql.AbstractMysqlEventParser.setConnectionCharset(java.lang.String)]: [public void com.alibaba.otter.canal.parse.inbound.mysql.AbstractMysqlEventParser.setConnectionCharset(java.nio.charset.Charset)]
2020-05-28 13:52:04.264 [main] INFO c.a.o.c.i.spring.support.PropertyPlaceholderConfigurer – Loading properties file from class path resource [canal.properties]
2020-05-28 13:52:04.265 [main] INFO c.a.o.c.i.spring.support.PropertyPlaceholderConfigurer – Loading properties file from class path resource [example/instance.properties]
2020-05-28 13:52:04.568 [main] INFO c.a.otter.canal.instance.spring.CanalInstanceWithSpring – start CannalInstance for 1-example
2020-05-28 13:52:04.572 [main] WARN c.a.o.canal.parse.inbound.mysql.dbsync.LogEventConvert – –> init table filter : ^.*\..*$
2020-05-28 13:52:04.573 [main] WARN c.a.o.canal.parse.inbound.mysql.dbsync.LogEventConvert – –> init table black filter :
2020-05-28 13:52:04.577 [main] INFO c.a.otter.canal.instance.core.AbstractCanalInstance – start successful….
2020-05-28 13:52:04.616 [destination = example , address = /127.0.0.1:3306 , EventParser] WARN c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy – —> begin to find start position, it will be long time for reset or first position
2020-05-28 13:52:04.616 [destination = example , address = /127.0.0.1:3306 , EventParser] WARN c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy – prepare to find start position just show master status
2020-05-28 13:52:06.556 [destination = example , address = /127.0.0.1:3306 , EventParser] WARN c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy – —> find start position successfully, EntryPosition[included=false,journalName=mysql-bin.000001,position=4,serverId=1,gtid=,timestamp=1590644973000] cost : 1935ms , the next step is binlog dump
四、初步监听实验
com.alibaba.otter
canal.client
1.1.0
import java.net.InetSocketAddress;
import java.util.List;
import com.alibaba.otter.canal.client.CanalConnectors;
import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.common.utils.AddressUtils;
import com.alibaba.otter.canal.protocol.Message;
import com.alibaba.otter.canal.protocol.CanalEntry.Column;
import com.alibaba.otter.canal.protocol.CanalEntry.Entry;
import com.alibaba.otter.canal.protocol.CanalEntry.EntryType;
import com.alibaba.otter.canal.protocol.CanalEntry.EventType;
import com.alibaba.otter.canal.protocol.CanalEntry.RowChange;
import com.alibaba.otter.canal.protocol.CanalEntry.RowData;
public class SimpleCanalClientExample {
public static void main(String args[]) {
// 创建链接
CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress(AddressUtils.getHostIp(),
11111), “example”, “”, “”);
int batchSize = 1000;
int emptyCount = 0;
try {
connector.connect();
connector.subscribe(“.*\\..*”);
connector.rollback();
int totalEmptyCount = 120;
while (emptyCount < totalEmptyCount) {
Message message = connector.getWithoutAck(batchSize); // 获取指定数量的数据
long batchId = message.getId();
int size = message.getEntries().size();
if (batchId == -1 || size == 0) {
emptyCount++;
System.out.println(“empty count : ” + emptyCount);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
} else {
emptyCount = 0;
// System.out.printf(“message[batchId=%s,size=%s] \n”, batchId, size);
printEntry(message.getEntries());
}
connector.ack(batchId); // 提交确认
// connector.rollback(batchId); // 处理失败, 回滚数据
}
System.out.println(“empty too many times, exit”);
} finally {
connector.disconnect();
}
}
private static void printEntry(List entrys) {
for (Entry entry : entrys) {
if (entry.getEntryType() == EntryType.TRANSACTIONBEGIN || entry.getEntryType() == EntryType.TRANSACTIONEND) {
continue;
}
RowChange rowChage = null;
try {
rowChage = RowChange.parseFrom(entry.getStoreValue());
} catch (Exception e) {
throw new RuntimeException(“ERROR ## parser of eromanga-event has an error , data:” + entry.toString(),
e);
}
EventType eventType = rowChage.getEventType();
System.out.println(String.format(“================> binlog[%s:%s] , name[%s,%s] , eventType : %s”,
entry.getHeader().getLogfileName(), entry.getHeader().getLogfileOffset(),
entry.getHeader().getSchemaName(), entry.getHeader().getTableName(),
eventType));
for (RowData rowData : rowChage.getRowDatasList()) {
if (eventType == EventType.DELETE) {
printColumn(rowData.getBeforeColumnsList());
} else if (eventType == EventType.INSERT) {
printColumn(rowData.getAfterColumnsList());
} else {
System.out.println(“——-> before”);
printColumn(rowData.getBeforeColumnsList());
System.out.println(“——-> after”);
printColumn(rowData.getAfterColumnsList());
}
}
}
}
private static void printColumn(List columns) {
for (Column column : columns) {
System.out.println(column.getName() + ” : ” + column.getValue() + ” update=” + column.getUpdated());
}
}
}
随便插入数据触发
INSERT INTO `demo`.`tb_ad`(`id`, `url`, `status`, `position`, `image`, `start_time`, `end_time`) VALUES (1, ‘https://www.baidu.com/’, ‘1’, ‘web_index_lb’, ‘https://pics1.baidu.com/feed/c83d70cf3bc79f3d5c30d358deb67a17738b29a6.jpeg?https://kins.oss-cn-shenzhen.aliyuncs.com/yhzb/2020-03-11/ca21b3b17d6f4757b991dd86b8cef3fa-VIP-680.jpeg’, ‘2020-05-22 10:58:08’, ‘2021-06-01 10:58:14’);
从控制台中看到
empty count : 66
empty count : 67
empty count : 68
empty count : 69
empty count : 70
================> binlog[mysql-bin.000001:355] , name[demo,tb_ad] , eventType : INSERT
id : 2 update=true
url : https://www.baidu.com/ update=true
status : 1 update=true
position : web_index_lb update=true
image : https://pics1.baidu.com/feed/c83d70cf3bc79f3d5c30d358deb67a17738b29a6.jpeg?https://kins.oss-cn-shenzhen.aliyuncs.com/yhzb/2020-03-11/ca21b3b17d6f4757b991dd86b8cef3fa-VIP-680.jpeg update=true
start_time : 2020-05-22 10:58:08 update=true
end_time : 2021-06-01 10:58:14 update=true
五、数据监控微服务
top.javatool
canal-spring-boot-starter
1.2.1-RELEASE
订阅数据库的增删改操作
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import top.javatool.canal.client.annotation.CanalTable;
import top.javatool.canal.client.handler.EntryHandler;
@Component
@CanalTable(value = “t_user”)
public class UserHandler implements EntryHandler {
private Logger logger = LoggerFactory.getLogger(UserHandler.class);
public void insert(User user) {
logger.info(“insert message {}”, user);
}
public void update(User before, User after) {
logger.info(“update before {} “, before);
logger.info(“update after {}”, after);
}
public void delete(User user) {
logger.info(“delete {}”, user);
}
}
启动数据监控微服务，修改user表，观察控制台输出。
2020-05-28 16:23:22.667 INFO 24284 — [l-client-thread] t.j.c.client.client.AbstractCanalClient : 获取消息 Message[id=23,entries=[header {
version: 1
logfileName: “mysql-bin.000001”
logfileOffset: 18380
serverId: 1
serverenCode: “UTF-8”
executeTime: 1590654201000
sourceType: MYSQL
schemaName: “”
tableName: “”
eventLength: 68
}
entryType: TRANSACTIONBEGIN
storeValue: ” \025″
, header {
version: 1
logfileName: “mysql-bin.000001”
logfileOffset: 18505
serverId: 1
serverenCode: “UTF-8”
executeTime: 1590654201000
sourceType: MYSQL
schemaName: “demo”
tableName: “t_user”
eventLength: 88
eventType: UPDATE
props {
key: “rowsCount”
value: “1”
}
}
entryType: ROWDATA
storeValue: “\b\210\002\020\002P\000b\370\003\n\033\b\000\020\004\032\002id \001(\0000\000B\00221R\aint(11)\n*\b\001\020\f\032\tuser_name \000(\0000\000B\005ZeldaR\fvarchar(255)\n*\b\002\020\372\377\377\377\377\377\377\377\377\001\032\006gender \000(\0000\000B\0010R\ntinyint(4)\n\”\b\003\020\004\032\ncountry_id \000(\0000\000B\0011R\aint(11)\n&\b\004\020[\032\bbirthday \000(\0000\000B\n1998-04-18R\004date\n7\b\005\020]\032\vcreate_time \000(\0000\000B\0231991-01-10 05:45:50R\ttimestamp\022\033\b\000\020\004\032\002id \001(\0000\000B\00221R\aint(11)\022.\b\001\020\f\032\tuser_name \000(\0010\000B\tZelda1111R\fvarchar(255)\022*\b\002\020\372\377\377\377\377\377\377\377\377\001\032\006gender \000(\0000\000B\0010R\ntinyint(4)\022\”\b\003\020\004\032\ncountry_id \000(\0000\000B\0011R\aint(11)\022&\b\004\020[\032\bbirthday \000(\0000\000B\n1998-04-18R\004date\0227\b\005\020]\032\vcreate_time \000(\0000\000B\0231991-01-10 05:45:50R\ttimestamp”
, header {
version: 1
logfileName: “mysql-bin.000001”
logfileOffset: 18593
serverId: 1
serverenCode: “UTF-8”
executeTime: 1590654201000
sourceType: MYSQL
schemaName: “”
tableName: “”
eventLength: 31
}
entryType: TRANSACTIONEND
storeValue: “\022\0041574”
],raw=false,rawEntries=[]]
2020-05-28 16:23:22.668 INFO 24284 — [xecute-thread-6] t.j.canal.example.handler.UserHandler : update before User{id=null, userName=’Zelda’, gender=null, countryId=null, birthday=null, createTime=null}
2020-05-28 16:23:22.668 INFO 24284 — [xecute-thread-6] t.j.canal.example.handler.UserHandler : update after User{id=21, userName=’Zelda1111′, gender=0, countryId=1, birthday=Sat Apr 18 00:00:00 CST 1998, createTime=Thu Jan 10 05:45:50 CST 1991}