前言
今天发现有一套 MySQL 8 数据库主从不同步了，报错如下：
sql
mysql> show slave status \G;
-- 错误内容
Last_Errno: 1032
Last_Error: Coordinator stopped because there were error(s) in the worker(s). The most recent failure being: Worker 1 failed executing transaction 'ANONYMOUS' at master log mysql-bin.003633, end_log_pos 603058578. See error log and/or performance_schema.replication_applier_status_by_worker table for more details about this failure or others, if any.
-- 根据提示消息查询详细报错
mysql> SELECT * FROM performance_schema.replication_applier_status_by_worker WHERE LAST_ERROR_NUMBER = 1032 \G;
-- 错误内容
LAST_ERROR_TIMESTAMP: 2025-09-06 20:08:06.998256
...
LAST_ERROR_MESSAGE: Worker 1 failed executing transaction 'ANONYMOUS' at master log mysql-bin.003633, end_log_pos 603058578;
Could not execute Update_rows event on table ci_sch***.qrtz_***_triggers;
Can't find record in 'qrtz_***_triggers', Error_code: 1032;
handler error HA_ERR_KEY_NOT_FOUND; the event's master log FIRST, end_log_pos 603058578由于不同步的时间已经很久了，主库的 binlog 已经不存在，所以只能重建从库了，本文使用 MySQL 8 的 clone 插件进行主从重建。
主从重建
安装插件
主从均需安装 clone 插件：
sql
mysql> install plugin clone soname 'mysql_clone.so';
Query OK
mysql> select plugin_name, plugin_status from information_schema.plugins where plugin_name = 'clone';
+-------------+---------------+
| PLUGIN_NAME | PLUGIN_STATUS |
+-------------+---------------+
| clone | ACTIVE |
+-------------+---------------+确保安装完成即可。
配置权限
执行克隆操作需要特定的权限，本地复制和远程复制权限不同：
- 本地克隆 ：执行克隆操作的用户需要
BACKUP_ADMIN权限； - 远程克隆 ：捐赠者（数据源）用户需要
BACKUP_ADMIN权限；接受者（目标）用户需要CLONE_ADMIN权限（该权限隐含了 BACKUP_ADMIN 和 SHUTDOWN 权限）；
主（源端）：
sql
mysql> GRANT BACKUP_ADMIN ON *.* TO 'root'@'%';
mysql> FLUSH PRIVILEGES;从（目标端）：
sql
mysql> GRANT CLONE_ADMIN ON *.* TO 'root'@'%';
mysql> FLUSH PRIVILEGES;远程克隆
从库开始克隆：
sql
-- 从库配置参数
mysql> set global clone_valid_donor_list='192.168.31.188:3306';
-- 从库开始克隆
mysql> clone instance from root@'192.168.31.188':3306 identified by 'P@ssw0rd';克隆过程中，从库可以查询进度：
sql
-- 查看克隆进度
mysql> SELECT
stage,
state,
CAST(begin_time AS DATETIME) AS "START TIME",
CAST(end_time AS DATETIME) AS "FINISH TIME",
LPAD(sys.format_time(POWER(10, 12) * (UNIX_TIMESTAMP(end_time) - UNIX_TIMESTAMP(begin_time))), 10, ' ') AS DURATION,
LPAD(CONCAT(FORMAT(ROUND(estimate / 1024 / 1024, 0), 0), "MB"), 16, ' ') AS "Estimate",
CASE
WHEN begin_time IS NULL THEN LPAD('%0', 7, ' ')
WHEN estimate > 0 THEN LPAD(CONCAT(ROUND(data * 100 / estimate, 0), "%"), 7, ' ')
WHEN end_time IS NULL THEN LPAD('0%', 7, ' ')
ELSE LPAD('100%', 7, ' ')
END AS "Done(%)"
FROM performance_schema.clone_progress;
+-----------+-----------+---------------------+---------------------+------------+------------------+---------+
| stage | state | START TIME | FINISH TIME | DURATION | Estimate | Done(%) |
+-----------+-----------+---------------------+---------------------+------------+------------------+---------+
| DROP DATA | Completed | 2026-01-05 15:34:10 | 2026-01-05 15:34:13 | 3.07 s | 0MB | 100% |
| FILE COPY | Completed | 2026-01-05 15:34:13 | 2026-01-05 15:58:13 | 24 m | 347,246MB | 100% |
| PAGE COPY | Completed | 2026-01-05 15:58:13 | 2026-01-05 15:58:13 | 507.57 ms | 18MB | 100% |
| REDO COPY | Completed | 2026-01-05 15:58:13 | 2026-01-05 15:58:14 | 368.4 ms | 0MB | 100% |
| FILE SYNC | Completed | 2026-01-05 15:58:14 | 2026-01-05 15:58:15 | 895.55 ms | 0MB | 100% |
| RESTART | Completed | 2026-01-05 15:58:15 | 2026-01-05 15:58:21 | 6.47 s | 0MB | 100% |
| RECOVERY | Completed | 2026-01-05 15:58:21 | 2026-01-05 15:58:23 | 1.64 s | 0MB | 100% |
+-----------+-----------+---------------------+---------------------+------------+------------------+---------+
-- 查看克隆最终状态
mysql> SELECT * FROM performance_schema.clone_status;
+------+------+-----------+-------------------------+-------------------------+--------------------+----------------+----------+---------------+------------------+-----------------+---------------+
| ID | PID | STATE | BEGIN_TIME | END_TIME | SOURCE | DESTINATION | ERROR_NO | ERROR_MESSAGE | BINLOG_FILE | BINLOG_POSITION | GTID_EXECUTED |
+------+------+-----------+-------------------------+-------------------------+--------------------+----------------+----------+---------------+------------------+-----------------+---------------+
| 1 | 0 | Completed | 2026-01-05 15:34:09.386 | 2026-01-05 15:58:22.894 | 192.168.31.188:3306 | LOCAL INSTANCE | 0 | | mysql-bin.004291 | 630818978 | |
+------+------+-----------+-------------------------+-------------------------+--------------------+----------------+----------+---------------+------------------+-----------------+---------------+等待克隆完成后，会自动重新启动从库 MySQL 实例。
启动主从复制
从库配置并启动主从复制：
sql
mysql> show variables like '%server_id%';
+----------------+-------+
| Variable_name | Value |
+----------------+-------+
| server_id | 2 |
| server_id_bits | 32 |
+----------------+-------+
-- 配置从库
mysql> change master to master_host='192.168.31.188',
master_port=3306,
master_user='repl',
master_password='P@ssw0rd',
master_log_file='mysql-bin.004291',
master_log_pos=630818978;
-- 启动主从同步
mysql> start slave;
Query OK
-- 检查主从同步状态
mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for source to send event
Master_Host: 192.168.31.188
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.004291
Read_Master_Log_Pos: 633519126
Relay_Log_File: mysql-relay-bin.000002
Relay_Log_Pos: 2697758
Relay_Master_Log_File: mysql-bin.004291
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 633516410
Relay_Log_Space: 2700684
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: 0df21031-d536-11ee-a0cd-005056a91cf7
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Replica has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
1 row in set可以发现，主从已经恢复正常同步。
写在最后
以前搭建 MySQL 主从都是使用 mysqldump 或者 PXB 备份恢复，耗时耗力。使用 clone 插件，只要符合它的限制条件，将是非常实用便捷的搭建方式。
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