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一、背景
分享一个在项目运维中遇到的一个主从复制限制的一个坑,项目的架构为主集群+灾备集群,每个集群为一主两从模式。主集群到灾备集群的同步为主从复制的方式,根据业务需求灾备集群需要忽略系统库跟某些配置表,所以才会触发此限制,而这个限制如果我们之前没有遇到过,那么排查起来也是相对不易的。
二、限制描述
1、主从同步出现报错
- greatsql> show slave status\G
- *************************** 1. row ***************************
- Slave_IO_State: Waiting for master to send event
- Master_Host: 192.168.xxx.xxx
- Master_User: repl
- Master_Port: 3306
- Connect_Retry: 60
- Master_Log_File: greatsql-bin.000990
- Read_Master_Log_Pos: 92274290
- Relay_Log_File: greatsql-relay.002963 -----
- Relay_Log_Pos: 701548899
- Relay_Master_Log_File: greatsql-bin.000988
- Slave_IO_Running: Yes
- Slave_SQL_Running: No
- Replicate_Do_DB:
- Replicate_Ignore_DB: mysql,dbscale,dbscale_tmp,information_schema,performance_schema,sys
- Replicate_Do_Table:
- Replicate_Ignore_Table:
- Replicate_Wild_Do_Table:
- Replicate_Wild_Ignore_Table: A.ab,B.bc
- Last_Errno: 1146
- Last_Error: Coordinator stopped because there were error(s) in the worker(s). The most recent failure being: Worker 1 failed executing transaction '9e668a93-2618-11ee-93ee-bc16954181bb:47508257' at master log greatdb-bin.000988, end_log_pos 701570116. See error log and/or performance_schema.replication_applier_status_by_worker table for more details about this failure or others, if any.
- Skip_Counter: 0
- Exec_Master_Log_Pos: 701548690
- Relay_Log_Space: 2246320360
- 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: NULL
- Master_SSL_Verify_Server_Cert: No
- Last_IO_Errno: 0
- Last_IO_Error:
- Last_SQL_Errno: 1146
- Last_SQL_Error: Coordinator stopped because there were error(s) in the worker(s). The most recent failure being: Worker 1 failed executing transaction '9e668a93-2618-11ee-93ee-bc16954181bb:47508257' at master log greatdb-bin.000988, end_log_pos 701570116. See error log and/or performance_schema.replication_applier_status_by_worker table for more details about this failure or others, if any.
- Replicate_Ignore_Server_Ids:
- Master_Server_Id: 1943306
- Master_UUID: 9e668a93-2618-11ee-93ee-bc16954181bb
- Master_Info_File: mysql.slave_master_info
- SQL_Delay: 0
- SQL_Remaining_Delay: NULL
- Slave_SQL_Running_State:
- Master_Retry_Count: 86400
- Master_Bind:
- Last_IO_Error_Timestamp:
- Last_SQL_Error_Timestamp: 230822 14:14:18
- Master_SSL_Crl:
- Master_SSL_Crlpath:
- Retrieved_Gtid_Set: 9e668a93-2618-11ee-93ee-bc16954181bb:2-47565802
- Executed_Gtid_Set: 30873cfe-8750-11ed-b56f-744aa4073024:1-270,
- 9e668a93-2618-11ee-93ee-bc16954181bb:1-47508256
- Auto_Position: 1
- Replicate_Rewrite_DB:
- Channel_Name:
- Master_TLS_Version:
- 1 row in set (0.00 sec)
复制代码 根据slave status状态信息可以看出
- 报错的GTID为:'9e668a93-2618-11ee-93ee-bc16954181bb:47508257'
- 应用的主集群的binlog为:greatsql-bin.000988
- 灾备集群的relay log为:greatsql-relay.002963
详细信息查看performance_schema.replication_applier_status_by_worker表
2、查看错误的详细信息
- greatsql> select * from performance_schema.replication_applier_status_by_worker\G
- *************************** 1. row ***************************
- CHANNEL_NAME:
- WORKER_ID: 1
- THREAD_ID: NULL
- SERVICE_STATE: OFF
- LAST_SEEN_TRANSACTION: 9e668a93-2618-11ee-93ee-bc16954181bb:47508257
- LAST_ERROR_NUMBER: 1146
- LAST_ERROR_MESSAGE: Worker 1 failed executing transaction
- '9e668a93-2618-11ee-93ee-bc16954181bb:47508257' at master log greatdb-bin.000988,
- end_log_pos 701570116; Error executing row event: 'Table 'abs_xxx.tmp_xxx_info' doesn't exist'
- LAST_ERROR_TIMESTAMP: 2023-08-22 14:14:18
复制代码 上述信息说明根据performance_schema.replication_applier_status_by_worker表中的详细错误信息可以发现为灾备集群abs_xxx.tmp_xxx_info表不存在,导致同步报错
3、问题分析
3.1、确认灾备集群中目标表是否存在- greatsql> show create table abs_xxx.tmp_xxx_info;
- ERROR 1146 (42S02): Table 'abs_xxx.tmp_xxx_info' doesn't exist
- greatsql> desc abs_xxx.tmp_xxx_info;
- ERROR 1146 (42S02): Table 'abs_xxx.tmp_xxx_info' doesn't exist
复制代码 结论:灾备集群中目标表的确不存在
3.2、根据主从报错信息解析主集群binlog,报错的SQL
解析主集群binlog- SET @@SESSION.GTID_NEXT= '9e668a93-2618-11ee-93ee-bc16954181bb:47508257'/*!*/;
- ……
- #230822 14:14:18 server id 1943306 end_log_pos 701570000 Table_map: `abs_xxx`.`tmp_xxx_info` mapped to number 1595
- # at 701570000
- #230822 14:14:18 server id 1943306 end_log_pos 701570116 Write_rows: table id 1595 flags: STMT_END_F
- ### INSERT INTO `abs_xxx`.`tmp_xxx_info`
- ### SET
- ### @1=2
- ### @2='自动化'
- ### @3='2300121212120000'
- ### @4='90000000'
- ### @5='1'
- ### @6='202001290231001'
- ### @7='2021-01-31 00:00:00'
- # at 701570116
- #230822 14:14:18 server id 1943306 end_log_pos 701570143 Xid = 800998400
- COMMIT/*!*/;
- # at 701570143
- #230822 14:14:18 server id 1943306 end_log_pos 701570204 GTID last_committed=26491 sequence_number=26521 rbr_only=yes
- /*!50718 SET TRANSACTION ISOLATION LEVEL READ COMMITTED*//*!*/;
复制代码 结论:根据复制的报错信息得知具体的GTID号以及主集群的binlog文件,解析binlog得知此事务为一条INSERT语句,语句中的目标表与performance_schema.replication_applier_status_by_worker表中信息一致
3.3、寻找主集群目标表binlog中是否有建表语句
在同一binlog日志中寻找建表语句- SET TIMESTAMP=1692684495/*!*/;
- CREATE DATABASE IF NOT EXISTS `abs_xxx` /*!40100 DEFAULT CHARACTER SET utf8 COLLATE utf8_bin */
- /*!*/;
- ……
- use `information_schema`/*!*/;
- SET TIMESTAMP=1692684495/*!*/;
- CREATE TABLE `abs_xxx`.`tmp_xxx_info` (
- `ID` int(64) NOT NULL AUTO_INCREMENT,
- `CUSTOMER_NAME` varchar(256) COLLATE utf8mb4_bin DEFAULT NULL,
- `CUSTOMER_NUM` varchar(256) COLLATE utf8mb4_bin DEFAULT NULL,
- `PRODIST_SKU_NUM` varchar(64) COLLATE utf8mb4_bin DEFAULT NULL,
- `STATUS` varchar(64) COLLATE utf8mb4_bin DEFAULT NULL,
- `AGREEMENT_NUM` varchar(256) COLLATE utf8mb4_bin DEFAULT NULL,
- `END_DATE` datetime DEFAULT NULL,
- PRIMARY KEY (`ID`),
- KEY `PK_PRODIST_SKU_NUM_AGREEMENT` (`PRODIST_SKU_NUM`) USING BTREE,
- KEY `IDX_AGREEMENT_NUM` (`AGREEMENT_NUM`) USING BTREE
- ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin ROW_FORMAT=DYNAMIC
- /*!*/;
- # at 475864451
复制代码 结论:在主集群的binlog日志中找到了目标表的建表语句,说明主集群执行DDL时并没有关闭binlog日志,那么继续查看在灾备集群的中继日志中是否存在DDL语句
3.4、解析灾备集群的中继日志,确认是否拉取到灾备集群- #230822 14:08:15 server id 1943306 end_log_pos 475863662 GTID last_committed=16341 sequence_number=16342 rbr_only=no
- SET @@SESSION.GTID_NEXT= '9e668a93-2618-11ee-93ee-bc16954181bb:47498079'/*!*/;
- ……
- use `information_schema`/*!*/;
- SET TIMESTAMP=1692684495/*!*/;
- CREATE TABLE `abs_xxx`.`tmp_xxx_info` (
- `ID` int(64) NOT NULL AUTO_INCREMENT,
- `CUSTOMER_NAME` varchar(256) COLLATE utf8mb4_bin DEFAULT NULL,
- `CUSTOMER_NUM` varchar(256) COLLATE utf8mb4_bin DEFAULT NULL,
- `PRODIST_SKU_NUM` varchar(64) COLLATE utf8mb4_bin DEFAULT NULL,
- `STATUS` varchar(64) COLLATE utf8mb4_bin DEFAULT NULL,
- `AGREEMENT_NUM` varchar(256) COLLATE utf8mb4_bin DEFAULT NULL,
- `END_DATE` datetime DEFAULT NULL,
- PRIMARY KEY (`ID`),
- KEY `PK_PRODIST_SKU_NUM_AGREEMENT` (`PRODIST_SKU_NUM`) USING BTREE,
- KEY `IDX_AGREEMENT_NUM` (`AGREEMENT_NUM`) USING BTREE
- ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin ROW_FORMAT=DYNAMIC
- /*!*/;
- # at 475864660
- #230822 14:08:15 server id 1943306 end_log_pos 475864512 GTID last_committed=16342 sequence_number=16343 rbr_only=yes
- /*!50718 SET TRANSACTION ISOLATION LEVEL READ COMMITTED*//*!*/;
复制代码 结论:灾备集群的中继日志中存在DDL建表语句,说明并不是IO线程出了问题
3.5、排查复制配置的忽略库表- Replicate_Ignore_DB: mysql,dbscale,dbscale_tmp,information_schema,performance_schema,sys
- Replicate_Wild_Ignore_Table: A.ab,B.bc
复制代码 结论:忽略库表中并不包含目标表,但是根据以上解析日志发现,在主集群binlog日志中建表语句之前有个use information_schema/!/; 的语句,此库为同步忽略的系统库,因此触发了GreatSQL的规范限制,在忽略库下对未忽略进行操作Statement模式下记录语句默认不起作用 (详情:https://dev.mysql.com/doc/refman/5.7/en/replication-options-replica.html#option_mysqld_replicate-do-db)
4、解决同步报错
在灾备集群创建目标表- greatsql> CREATE TABLE `abs_xxx`.`tmp_xxx_info` (
- `ID` int(64) NOT NULL AUTO_INCREMENT,
- `CUSTOMER_NAME` varchar(256) COLLATE utf8mb4_bin DEFAULT NULL,
- `CUSTOMER_NUM` varchar(256) COLLATE utf8mb4_bin DEFAULT NULL,
- `PRODIST_SKU_NUM` varchar(64) COLLATE utf8mb4_bin DEFAULT NULL,
- `STATUS` varchar(64) COLLATE utf8mb4_bin DEFAULT NULL,
- `AGREEMENT_NUM` varchar(256) COLLATE utf8mb4_bin DEFAULT NULL,
- `END_DATE` datetime DEFAULT NULL,
- PRIMARY KEY (`ID`),
- KEY `PK_PRODIST_SKU_NUM_AGREEMENT` (`PRODIST_SKU_NUM`) USING BTREE,
- KEY `IDX_AGREEMENT_NUM` (`AGREEMENT_NUM`) USING BTREE
- ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin ROW_FORMAT=DYNAMIC;
- greatsql> stop slave;
- greatsql> start slave;
复制代码 结论:在灾备集群创建目标表后重启复制恢复成功
三、限制规避
1、第一种规避方式
执行DDL时进入目标库- greatsql> use abs_cust
- greatsql> DDL 语句(CREATE\DROP\ALTER)
复制代码 说明:在应用连接数据库时有可能默认就是information_schema库,而此环境将系统库全部忽略,所以为了规避类似的问题,请在执行SQL语句时请先use到目标表的目标库。
2、第二种规避方式
修改主从复制配置,以下步骤为测试环境
关闭灾备集群在复制同步- greatsql> stop slave;
- Query OK, 0 rows affected, 1 warning (0.03 sec)
复制代码 修改忽略库- greatsql> change replication filter Replicate_Ignore_DB=();
复制代码 修改忽略表- greatsql> change replication filter replicate_wild_ignore_table =('mysql.%','information_schema.%','sys.%','performance_schema.%');
复制代码 启动同步- greatsql> start slave;
- Query OK, 0 rows affected, 1 warning (0.37 sec)
复制代码 测试验证
主集群:- greatsql> use mysql
- Reading table information for completion of table and column names
- You can turn off this feature to get a quicker startup with -A
- Database changed
- greatsql> create table test111.test111(id int primary key);
- Query OK, 0 rows affected (0.06 sec)
- greatsql> show tables;
- +-------------------+
- | Tables_in_test111 |
- +-------------------+
- | test111 |
- +-------------------+
- 1 row in set (0.00 sec)
复制代码 灾备集群:- greatsql> use test111
- Reading table information for completion of table and column names
- You can turn off this feature to get a quicker startup with -A
- Database changed
- greatsql> show tables;
- +-------------------+
- | Tables_in_test111 |
- +-------------------+
- | test111 |
- +-------------------+
- 1 row in set (0.00 sec)
复制代码 说明:复制配置中参数Replicate_Ignore_DB设置为空,将replicate_wild_ignore_table参数设置为shema_name.%的方式也可以规避类似的问题
四、特别说明
Enjoy GreatSQL
来源:https://www.cnblogs.com/greatsql/p/17731957.html
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