使用canal数据同步的踩坑

最新推荐文章于 2025-03-25 09:40:47 发布

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最新推荐文章于 2025-03-25 09:40:47 发布

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本文链接：https://blog.youkuaiyun.com/weixin_44188501/article/details/107392089

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先上配置

开启mysql 的binlog功能

1、修改 mysql 的配置文件 my.cnf
	vi /etc/my.cnf 
	追加内容：
	log-bin=mysql-bin     #binlog文件名
	binlog_format=ROW     #选择row模式
	server_id=1           #mysql实例id,不能和canal的slaveId重复
2、重启 mysql：
	systemctl restart mariadb.service
3、登录 mysql 客户端，查看 log_bin 变量
	mysql> show variables like 'log_bin';
	+---------------+-------+
	| Variable_name | Value |
	+---------------+-------+
	| log_bin       | ON|
	+---------------+-------+
	1 row in set (0.00 sec)————————————————
	如果显示状态为ON表示该功能已开启
4、在mysql里面添加以下的相关用户和权限
	CREATE USER 'canal'@'%' IDENTIFIED BY 'canal';
	GRANT SHOW VIEW, SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'canal'@'%';
	FLUSH PRIVILEGES;

下载安装Canal服务

cd /usr/local/canal
canal.deployer-1.1.4.tar.gz
tar zxvf canal.deployer-1.1.4.tar.gz

修改配置文件：vim conf/canal.properties

找到canal.instance.parser.parallelThreadSize = 16
把这一行的注释符号去掉（java才能成功运行）

修改配置文件：vi conf/example/instance.properties

#需要改成自己的数据库信息
canal.instance.master.address=192.168.44.132:3306

#需要改成自己的数据库用户名与密码
canal.instance.dbUsername=canal
canal.instance.dbPassword=canal

#需要改成同步的数据库表规则，例如只是同步一下表
#canal.instance.filter.regex=.*\\..*
canal.instance.filter.regex=guli_ucenter.ucenter_member11

注：

mysql 数据解析关注的表，Perl正则表达式.
多个正则之间以逗号(,)分隔，转义符需要双斜杠(\\) 
常见例子：
1.  所有表：.*   or  .*\\..*
2.  canal schema下所有表： canal\\..*
3.  canal下的以canal打头的表：canal\\.canal.*
4.  canal schema下的一张表：canal.test1
5.  多个规则组合使用：canal\\..*,mysql.test1,mysql.test2 (逗号分隔)
注意：此过滤条件只针对row模式的数据有效(ps. mixed/statement因为不解析sql，所以无法准确提取tableName进行过滤)

进入bin目录下启动（sh bin/startup.sh）
并查看进程 ps -ef | grep canal
在这里插入图片描述
发现没有成功启动，但也没报错（忘了看日志，日志报不报错不清楚）
切换jdk版本解决，从jdk14换成jdk8完美解决

也可以看日志判断是否启动成功
vim logs/canal/canal.log
有下面的这三句话即表示成功

[main] INFO  com.alibaba.otter.canal.deployer.CanalLauncher - ## start the canal server.
[main] INFO  com.alibaba.otter.canal.deployer.CanalController - ## start the canal server[10.1.29.120:11111]
[main] INFO  com.alibaba.otter.canal.deployer.CanalLauncher - ## the canal server is running now ......

使用Java调用监听canal

com.alibaba.otter.canal.protocol.exception.CanalClientException:
 java.net.ConnectException: Connection timed out: connect

连接不上canal，发现没关防火墙

#关闭防火墙
ystemctl stop firewalld

连接成功，为192.168.1.109虚拟机的mysql添加数据，但是发现没有监听到，本地127.0.0.1的mysql对应的表没有更新数据。
查看日志
vim logs/example/example.log

2020-07-16 19:20:37.709 [destination = example , address = /192.168.1.109:3306 , EventParser] 
ERROR com.alibaba.otter.canal.common.alarm.LogAlarmHandler - destination:example
[com.alibaba.otter.canal.parse.exception.CanalParseException: java.io.IOException: connect /192.168.1.109:3306 failure
Caused by: java.io.IOException: connect /192.168.1.109:3306 failure
 at com.alibaba.otter.canal.parse.driver.mysql.MysqlConnector.connect(MysqlConnector.java:83)
 at com.alibaba.otter.canal.parse.inbound.mysql.MysqlConnection.connect(MysqlConnection.java:89)
 at com.alibaba.otter.canal.parse.inbound.mysql.MysqlEventParser.preDump(MysqlEventParser.java:86)
 at com.alibaba.otter.canal.parse.inbound.AbstractEventParser$3.run(AbstractEventParser.java:183)
 at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Error When doing Client Authentication:ErrorPacket [errorNumber=1045, fieldCount=-1, message=Access denied for user 'canal'@'bogon' (using password: YES), sqlState=28000, sqlStateMarker=#]
 at com.alibaba.otter.canal.parse.driver.mysql.MysqlConnector.negotiate(MysqlConnector.java:271)
 at com.alibaba.otter.canal.parse.driver.mysql.MysqlConnector.connect(MysqlConnector.java:80)
 ... 4 more

说我密码错误，不可能啊我已经在本地用canal这个用户连接到Linux中的mysql了，上百度了

https://blog.youkuaiyun.com/zhu592665411/article/details/80617101
https://github.com/alibaba/canal/issues/146

可能是我本地和Linux中的mysql版本不一致导致的，多出来几个匿名用户。
本地：
在这里插入图片描述
Linux：

根据上面文章执行

mysql> use mysql 
mysql> delete from user where user=''; 
mysql> flush privileges;

运行成功
在这里插入图片描述

顺便看一眼代码：

package com.atguigu.canal.client;

import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.client.CanalConnectors;
import com.alibaba.otter.canal.protocol.CanalEntry.*;
import com.alibaba.otter.canal.protocol.Message;
import com.google.protobuf.InvalidProtocolBufferException;
import org.apache.commons.dbutils.DbUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.sql.DataSource;
import java.net.InetSocketAddress;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.List;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;

@Component
public class CanalClient {
    //sql队列
    private Queue<String> SQL_QUEUE = new ConcurrentLinkedQueue<>();

    @Resource
    private DataSource dataSource;

    /**
     * canal入库方法
     */
    public void run() {
        CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress("192.168.1.109",
                11111), "example", "", "");
        int batchSize = 1000;
        try {
            connector.connect();
            connector.subscribe(".*\\..*");
            connector.rollback();
            try {
                while (true) {
                    //尝试从master那边拉去数据batchSize条记录，有多少取多少
                    Message message = connector.getWithoutAck(batchSize);
                    long batchId = message.getId();
                    int size = message.getEntries().size();
                    if (batchId == -1 || size == 0) {
                        Thread.sleep(1000);
                    } else {
                        dataHandle(message.getEntries());
                    }
                    connector.ack(batchId);

                    //当队列里面堆积的sql大于一定数值的时候就模拟执行
                    if (SQL_QUEUE.size() >= 1) {
                        executeQueueSql();
                    }
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (InvalidProtocolBufferException e) {
                e.printStackTrace();
            }
        } finally {
            connector.disconnect();
        }
    }

    /**
     * 模拟执行队列里面的sql语句
     */
    public void executeQueueSql() {
        int size = SQL_QUEUE.size();
        for (int i = 0; i < size; i++) {
            String sql = SQL_QUEUE.poll();
            System.out.println("[sql]----> " + sql);

            this.execute(sql.toString());
        }
    }

    /**
     * 数据处理
     *
     * @param entrys
     */
    private void dataHandle(List<Entry> entrys) throws InvalidProtocolBufferException {
        for (Entry entry : entrys) {
            if (EntryType.ROWDATA == entry.getEntryType()) {
                RowChange rowChange = RowChange.parseFrom(entry.getStoreValue());
                EventType eventType = rowChange.getEventType();
                if (eventType == EventType.DELETE) {
                    saveDeleteSql(entry);
                } else if (eventType == EventType.UPDATE) {
                    saveUpdateSql(entry);
                } else if (eventType == EventType.INSERT) {
                    saveInsertSql(entry);
                }
            }
        }
    }

    /**
     * 保存更新语句
     *
     * @param entry
     */
    private void saveUpdateSql(Entry entry) {
        try {
            RowChange rowChange = RowChange.parseFrom(entry.getStoreValue());
            List<RowData> rowDatasList = rowChange.getRowDatasList();
            for (RowData rowData : rowDatasList) {
                List<Column> newColumnList = rowData.getAfterColumnsList();
                StringBuffer sql = new StringBuffer("update " + entry.getHeader().getTableName() + " set ");
                for (int i = 0; i < newColumnList.size(); i++) {
                    sql.append(" " + newColumnList.get(i).getName()
                            + " = '" + newColumnList.get(i).getValue() + "'");
                    if (i != newColumnList.size() - 1) {
                        sql.append(",");
                    }
                }
                sql.append(" where ");
                List<Column> oldColumnList = rowData.getBeforeColumnsList();
                for (Column column : oldColumnList) {
                    if (column.getIsKey()) {
                        //暂时只支持单一主键
                        sql.append(column.getName() + "=" + column.getValue());
                        break;
                    }
                }
                SQL_QUEUE.add(sql.toString());
            }
        } catch (InvalidProtocolBufferException e) {
            e.printStackTrace();
        }
    }

    /**
     * 保存删除语句
     *
     * @param entry
     */
    private void saveDeleteSql(Entry entry) {
        try {
            RowChange rowChange = RowChange.parseFrom(entry.getStoreValue());
            List<RowData> rowDatasList = rowChange.getRowDatasList();
            for (RowData rowData : rowDatasList) {
                List<Column> columnList = rowData.getBeforeColumnsList();
                StringBuffer sql = new StringBuffer("delete from " + entry.getHeader().getTableName() + " where ");
                for (Column column : columnList) {
                    if (column.getIsKey()) {
                        //暂时只支持单一主键
                        sql.append(column.getName() + "=" + column.getValue());
                        break;
                    }
                }
                SQL_QUEUE.add(sql.toString());
            }
        } catch (InvalidProtocolBufferException e) {
            e.printStackTrace();
        }
    }

    /**
     * 保存插入语句
     * @param entry
     */
    private void saveInsertSql(Entry entry) {
        try {
            RowChange rowChange = RowChange.parseFrom(entry.getStoreValue());
            List<RowData> rowDatasList = rowChange.getRowDatasList();
            for (RowData rowData : rowDatasList) {
                List<Column> columnList = rowData.getAfterColumnsList();
                StringBuffer sql = new StringBuffer("insert into " + entry.getHeader().getTableName() + " (");
                for (int i = 0; i < columnList.size(); i++) {
                    sql.append(columnList.get(i).getName());
                    if (i != columnList.size() - 1) {
                        sql.append(",");
                    }
                }
                sql.append(") VALUES (");
                for (int i = 0; i < columnList.size(); i++) {
                    sql.append("'" + columnList.get(i).getValue() + "'");
                    if (i != columnList.size() - 1) {
                        sql.append(",");
                    }
                }
                sql.append(")");
                SQL_QUEUE.add(sql.toString());
            }
        } catch (InvalidProtocolBufferException e) {
            e.printStackTrace();
        }
    }

    /**
     * 入库
     * @param sql
     */
    public void execute(String sql) {
        Connection con = null;
        try {
            if(null == sql) return;
            con = dataSource.getConnection();
            QueryRunner qr = new QueryRunner();
            int row = qr.execute(con, sql);
            System.out.println("update: "+ row);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DbUtils.closeQuietly(con);
        }
    }
}