在云服务器上构建一个云数据库RDS数据库的从库，构建的方式也相对比较简单，和搭建主从的复制没啥区别，这里不做具体介绍；
构建完成后，业务上线之后，构建的从库出现 主从复制 报错的问题，具体的报错信息如下所示：
备注：由于云数据库RDS由于没有开启GTID，所以只能基于偏移量进行 主从复制 、
（有些强一致性金融级云数据库RDS默认GTID是关闭的）
mysql>show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: xxxxx
Master_User: xxxxx
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 192682856
Relay_Log_File: slave-relay-bin.000002
Relay_Log_Pos: 182919607
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB: db_log
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table: mysql.%,information_schema.%,performance_schema.%,sys.%
Last_Errno: 1298
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.000001, end_log_pos 189340186. 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: 189340026
Relay_Log_Space: 186263083
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: 1298
Last_SQL_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.000001, end_log_pos 189340186. 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: 2230469996
Master_UUID: 101414c4-4c0a-11ec-bd6b-0c42a1f03afe
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: 220115 13:48:22
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
查看performance_schema.replication_applier_status_by_worker表查看具体的报错信息如下：
mysql>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: ANONYMOUS
LAST_ERROR_NUMBER: 1298
LAST_ERROR_MESSAGE: Worker 1 failed executing transaction 'ANONYMOUS' at master log mysql-bin.000001, end_log_pos 189340186; Error 'Unknown or incorrect time zone: 'Asia/Shanghai'' on query. Default database: 'inter_dg_log'. Query: 'BEGIN'
LAST_ERROR_TIMESTAMP: 2022-01-15 13:48:22
从报错信息看，是由于binlog中存在设置时区time zone为Asia/Shanghai而导致的报错：
Error ‘Unknown or incorrect time zone: ‘Asia/Shanghai”
接下来我们解析一下Binlog日志，确认一下具体执行的SQL语句
# at 182919672
#220115 11:11:08 server id 2230469996 end_log_pos 189340186 CRC32 0x4c174b2d Query thread_id=7046077 exec_time=0 error_code=0
SET TIMESTAMP=1642216268/*!*/;
SET @@session.time_zone='Asia/Shanghai'/*!*/;
BEGIN
/*!*/;
# at 182919767
#220115 11:11:08 server id 2230469996 end_log_pos 189340301 CRC32 0xabbdbdb8 Rows_query
通过解析binlog文件，确实发现binlog中有设置时区的语句：SET @@session.time_zone=’Asia/Shanghai’
按道理的话，设置session级别应该是支持的，那为什么会出现报错呢？
接下来，我们查看一下，目前从库设置的时区
mysql>show variables like '%time_zone%';
+------------------+--------+
| Variable_name | Value |
+------------------+--------+
| system_time_zone | CST |
| time_zone | +08:00 |
+------------------+--------+
2 rows in set (0.01 sec)
从库实例默认时区格式是’+8:00’的格式
默认这个时区设置是没有的，mysql默认不支持’Asia/Shanghai’这种时区格式
mysql>set global time_zone='Asia/Shanghai';
ERROR 1298 (HY000): Unknown or incorrect time zone: 'Asia/Shanghai'
那如何解决这个问题呢？
需要从mysql官网下载一个时区文件，下载地址：https://dev.mysql.com/downloads/timezones.html
下载完成后，解压后是一个SQL文件，将SQL文件导入到系统库mysql中，然后就支持设置支持’Asia/Shanghai’这种时区格式
mysql>set session time_zone='Asia/Shanghai';
Query OK, 0 rows affected (0.00 sec)
mysql>show variables like '%time_zone%';
+------------------+---------------+
| Variable_name | Value |
+------------------+---------------+
| system_time_zone | CST |
| time_zone | Asia/Shanghai |