一、问题来源
有一个朋友@水米田 问我，基于POSITION的主从。他做了如下的操作
将备份的一些binlog文件加入到了目录中
修改index文件，加入了这些binlog文件
flush binary logs
然后整个主从环境大量延迟。
二、朋友的测试
下面是另外一个朋友@徐晨亮的测试：
master上：
(root:db1@xucl:10:30:22)[(none)]> show binary logs;
+---------------------+-----------+
| Log_name | File_size |
+---------------------+-----------+
| mysql-binlog.000031 | 1019 |
| mysql-binlog.000032 | 424 |
| mysql-binlog.000033 | 244 |
| mysql-binlog.000034 | 2332 |
| mysql-binlog.000035 | 2134 |
| mysql-binlog.000036 | 845915 |
| mysql-binlog.000037 | 11735 |
| mysql-binlog.000038 | 284 |
| mysql-binlog.000039 | 284 |
| mysql-binlog.000040 | 284 |
| mysql-binlog.000041 | 284 |
| mysql-binlog.000042 | 234 |
+---------------------+-----------+
12 rows in set (0.00 sec)
(root:db1@xucl:10:30:34)[(none)]> purge binary logs to 'mysql-binlog.000039';
Query OK, 0 rows affected (0.00 sec)
(root:db1@xucl:10:30:49)[(none)]> show binary logs;
+---------------------+-----------+
| Log_name | File_size |
+---------------------+-----------+
| mysql-binlog.000039 | 284 |
| mysql-binlog.000040 | 284 |
| mysql-binlog.000041 | 284 |
| mysql-binlog.000042 | 234 |
+---------------------+-----------+
4 rows in set (0.00 sec)
执行插入数据
(root:db1@xucl:10:31:23)[xucl]> insert into t values(9,9);
将备份的binlog拷贝回原先的目录并修改index文件进行注册
[root@izbp12nspj47ypto9t6vyez logs]# ll
总用量 884
-rw-r----- 1 mysql mysql 1019 5月 20 22:03 mysql-binlog.000031
-rw-r----- 1 mysql mysql 424 5月 20 22:03 mysql-binlog.000032
-rw-r----- 1 mysql mysql 244 5月 20 22:03 mysql-binlog.000033
-rw-r----- 1 mysql mysql 2332 5月 20 22:03 mysql-binlog.000034
-rw-r----- 1 mysql mysql 2134 5月 20 22:03 mysql-binlog.000035
-rw-r----- 1 mysql mysql 845915 5月 20 22:03 mysql-binlog.000036
-rw-r----- 1 mysql mysql 11735 5月 20 22:05 mysql-binlog.000037
-rw-r----- 1 mysql mysql 284 5月 20 22:06 mysql-binlog.000038
-rw-r----- 1 mysql mysql 284 5月 21 10:28 mysql-binlog.000039
-rw-r----- 1 mysql mysql 284 5月 21 10:28 mysql-binlog.000040
-rw-r----- 1 mysql mysql 284 5月 21 10:28 mysql-binlog.000041
-rw-r----- 1 mysql mysql 491 5月 21 10:31 mysql-binlog.000042
-rw-r----- 1 mysql mysql 204 5月 21 10:30 mysql-binlog.index
主库flush binary logs
(root:db1@xucl:10:32:51)[(none)]> flush binary logs;
Query OK, 0 rows affected (0.01 sec)
(root:db1@xucl:10:32:57)[(none)]> show binary logs;
+---------------------+-----------+
| Log_name | File_size |
+---------------------+-----------+
| mysql-binlog.000031 | 1019 |
| mysql-binlog.000032 | 424 |
| mysql-binlog.000033 | 244 |
| mysql-binlog.000034 | 2332 |
| mysql-binlog.000035 | 2134 |
| mysql-binlog.000036 | 845915 |
| mysql-binlog.000037 | 11735 |
| mysql-binlog.000038 | 284 |
| mysql-binlog.000039 | 284 |
| mysql-binlog.000040 | 284 |
| mysql-binlog.000041 | 284 |
| mysql-binlog.000042 | 541 |
| mysql-binlog.000043 | 234 |
+---------------------+-----------+
13 rows in set (0.00 sec)
此时，slave报错如下：
(root:db1@xucl:10:31:05)[(none)]> show slave status\G
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 127.0.0.1
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-binlog.000035
Read_Master_Log_Pos: 194
Relay_Log_File: izbp12nspj47ypto9t6vyez-relay-bin.000011
Relay_Log_Pos: 373
Relay_Master_Log_File: mysql-binlog.000035
Slave_IO_Running: No
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: 194
Relay_Log_Space: 648
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: 1236
Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Cannot replicate GTID-transaction when @@GLOBAL.GTID_MODE = OFF, at file /storage/single/mysql3306/logs/mysql-binlog.000035, position 194.; the first event 'mysql-binlog.000039' at 234, the last event read from '/storage/single/mysql3306/logs/mysql-binlog.000035' at 259, the last byte read from '/storage/single/mysql33'
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 3306
Master_UUID: e8bdf01a-c79b-11e8-82b3-00163e088352
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp: 190521 10:32:57
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: 4c423515-6661-11e9-b767-00163e088352:1-7,
e8bdf01a-c79b-11e8-82b3-00163e088352:1-57192
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
从slave上的报错来看，在主库flush binary logs后，从库又读取注册的binlog并且又apply了MySQL手动注册binlog文件造成主从异常的原因
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