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mysql主从复制不同步异常
查看从库同步状态，发现Slave_SQL_Running: No状态异常,主备库已经不再同步，初步怀疑是断电倒是binlog的问题
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.3
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: log-bin.000030
Read_Master_Log_Pos: 54007656
Relay_Log_File: slave01-relay-bin.000068
Relay_Log_Pos: 63524817
Relay_Master_Log_File: log-bin.000029
..........................................
Replicate_Wild_Ignore_Table:
Last_Errno: 1594
Last_Error: Relay log read failure: Could not parse relay log event entry.
The possible reasons are: the master's binary log is corrupted (you can check this by running 'mysqlbinlog' on the binary log),
the slave's relay log is corrupted (you can check this by running 'mysqlbinlog' on the relay log),
a network problem, or a bug in the master's or slave's MySQL code. If you want to check the master's binary log
or slave's relay log, you will be able to know their names by issuing 'SHOW SLAVE STATUS' on this slave.
查看下slave的error log 发现binlog最后截止在 'log-bin.000029' position 63524608
2017-10-13T05:44:56.382911Z 1 [Note] Slave I/O thread killed while reading event for channel ''
2017-10-13T05:44:56.382941Z 1 [Note] Slave I/O thread exiting for channel '', read up to log 'log-bin.000030', position 54007656
2017-10-13T05:44:58.675958Z 7 [Note] Slave I/O thread: Start semi-sync replication to master '[email protected]:3306' in log 'log-bin.000030' at position 54007656
2017-10-13T05:44:58.675993Z 7 [Warning] Storing MySQL user name or password information in the master info repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START SLAVE; see the 'START SLAVE Syntax' in the MySQL Manual for more information.
2017-10-13T05:44:58.677146Z 7 [Note] Slave I/O thread for channel '': connected to master '[email protected]:3306',replication started in log 'log-bin.000030' at position 54007656
2017-10-13T05:44:58.687664Z 8 [Warning] Slave SQL for channel '': If a crash happens this configuration does not guarantee that the relay log info will be consistent, Error_code: 0
2017-10-13T05:44:58.688769Z 8 [Note] Slave SQL thread for channel '' initialized, starting replication in log 'log-bin.000029' at position 63524608, relay log './slave01-relay-bin.000068' position: 63524817
2017-10-13T05:44:58.688858Z 8 [ERROR] Error in Log_event::read_log_event(): 'read error', data_len: 65, event_type: 34
2017-10-13T05:44:58.688865Z 8 [ERROR] Error reading relay log event for channel '': slave SQL thread aborted because of I/O error
2017-10-13T05:44:58.688877Z 8 [ERROR] Slave SQL for channel '': Relay log read failure: Could not parse relay log event entry. The possible reasons are: the master's binary log is corrupted (you can check this by running 'mysqlbinlog' on the binary log),
the slave's relay log is corrupted (you can check this by running 'mysqlbinlog' on the relay log), a network problem, or a bug in the master's or slave's MySQL code. If you want to check the master's binary log or slave's relay log, you will be able to know
their names by issuing 'SHOW SLAVE STATUS' on this slave. Error_code: 1594
2017-10-13T05:44:58.688881Z 8 [ERROR] Error running query, slave SQL thread aborted. Fix the problem, and restart the slave SQL thread with "SLAVE START".
We stopped at log 'log-bin.000029' position 63524608
mysql>show binlog events in 'log-bin.000029' from 63524608 limit 3; 查看位于 pos 为 63524608 的一行记录下 endpos 63524608
于是采用在slave上重新定位master的binlog的方法以重新同步主备库
mysql> stop slave;
Query OK, 0 rows affected (0.03 sec)
mysql> change master to master_host='192.168.1.3',master_user='repl',master_password='ppay', master_log_file='log-bin.000029',master_log_pos=63524608;
Query OK, 0 rows affected, 2 warnings (0.16 sec)
开启slave
mysql> start slave ;
Query OK, 0 rows affected (0.02 sec)
查看同步状态
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.3
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: log-bin.000030
Read_Master_Log_Pos: 54416555
Relay_Log_File: slave01-relay-bin.000002
Relay_Log_Pos: 318
Relay_Master_Log_File: log-bin.000029
Slave_IO_Running: Yes
Slave_SQL_Running: No
...................................
Last_Errno: 1062
Last_Error: Could not execute Write_rows event on table log.logsver; Duplicate entry '874655' for key 'PRIMARY', Error_code: 1062; handler error HA_ERR_FOUND_DUPP_KEY; the event's master log log-bin.000029, end_log_pos 63525006
Skip_Counter: 0
Exec_Master_Log_Pos: 63524608
Relay_Log_Space: 54417775
....................................
Last_SQL_Errno: 1062
Last_SQL_Error: Could not execute Write_rows event on table log.logsver; Duplicate entry '874655' for key 'PRIMARY', Error_code: 1062; handler error HA_ERR_FOUND_DUPP_KEY; the event's master log log-bin.000029, end_log_pos 63525006
Replicate_Ignore_Server_Ids:
....................................
ERROR:
No query specified
重新启动slave之后，又出现了新的错误，常见的error 1062，主键重复
主键重复
在slave已经有874655该条记录，又在master上插入了同一条记录，所以报错。
Last_SQL_Error: Could not execute Write_rows event on table log.logsver;
Duplicate entry '874655' for key 'PRIMARY',
Error_code: 1062; handler error HA_ERR_FOUND_DUPP_KEY;
the event's master log log-bin.000029, end_log_pos 63525006
解决方法：
在slave上先看下log.logsver表结构,在主备库上查询重复的记录状态
mysql> desc log.logsver;
+----------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+----------------+
| id | int(100) | NO | PRI | NULL | auto_increment |
| name | varchar(50) | NO | | NULL | |
| level | int(2) | NO | | NULL | |
| msg | varchar(255) | NO | | NULL | |
| intime | datetime | NO | | NULL | |
| codename | varchar(25) | YES | | NULL | |
| codefunc | varchar(25) | YES | | NULL | |
| codeline | varchar(10) | YES | | NULL | |
| process | varchar(10) | YES | | NULL | |
+----------+--------------+------+-----+---------+----------------+
停止slave
mysql>stop slave;
删除重复的主键
mysql> delete from logsver where id=874655;
Query OK, 1 row affected (0.07 sec)
mysql> commit;
Query OK, 0 rows affected (0.00 sec)
重新开启salve
mysql> start slave;
Query OK, 0 rows affected (0.02 sec)
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.3
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: log-bin.000030
Read_Master_Log_Pos: 54997622
Relay_Log_File: slave01-relay-bin.000003
Relay_Log_Pos: 43225
Relay_Master_Log_File: log-bin.000030
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
.................................
1 row in set (0.00 sec)
在master上和slave上分别确认,
mysql> select count(*) from logsver where id=874655;
+----------+
| count(*) |
+----------+
| 1 |
+----------+
mysql> select count(*) from logsver where id=874655;
+----------+
| count(*) |
+----------+
| 1 |
+----------+
至此，主备库重新同步正常