reset slave
首先来看下当前master-slave情况

mysql> prompt \u@\h,\p:\d>\_

PROMPT set to '\u@\h,\p:\d>\_'

# master

mydba@192.168.85.129,3306:test> show master status;

+------------------+----------+--------------+------------------+-------------------+

| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

+------------------+----------+--------------+------------------+-------------------+

| mysql-bin.000007 |      120 |              |                  |                   |

+------------------+----------+--------------+------------------+-------------------+

1 row in set (0.00 sec)

# slave

mydba@192.168.85.129,3307:test> show slave status\G

*************************** 1. row ***************************

               Slave_IO_State: Waiting for master to send event

                  Master_Host: 192.168.85.129

                  Master_User: repl

                  Master_Port: 3306

                Connect_Retry: 60

              Master_Log_File: mysql-bin.000007

          Read_Master_Log_Pos: 120

               Relay_Log_File: mysql-relay-bin.000011

                Relay_Log_Pos: 283

        Relay_Master_Log_File: mysql-bin.000007

             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: 120

              Relay_Log_Space: 15247

              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: 6

                  Master_UUID: 02a05b2c-0557-11e7-bb02-000c29493a20

             Master_Info_File: /usr/local/mysql3307/log/master.info

                    SQL_Delay: 0

          SQL_Remaining_Delay: NULL

      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it

           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

1 row in set (0.00 sec)

此时主从处于同步状态，接着在从库上执行reset slave，并查看同步情况

# slave

mydba@192.168.85.129,3307:test> stop slave;

Query OK, 0 rows affected (0.20 sec)

mydba@192.168.85.129,3307:test> reset slave;

Query OK, 0 rows affected (0.07 sec)

mydba@192.168.85.129,3307:test> start slave;

Query OK, 0 rows affected (0.05 sec)

mydba@192.168.85.129,3307:test> show slave status\G

*************************** 1. row ***************************

               Slave_IO_State: Waiting for master to send event

                  Master_Host: 192.168.85.129

                  Master_User: repl

                  Master_Port: 3306

                Connect_Retry: 60

              Master_Log_File: mysql-bin.000007

          Read_Master_Log_Pos: 120

               Relay_Log_File: mysql-relay-bin.000003

                Relay_Log_Pos: 283

        Relay_Master_Log_File: mysql-bin.000001

             Slave_IO_Running: Yes

            Slave_SQL_Running: No

              Replicate_Do_DB:

          Replicate_Ignore_DB:

           Replicate_Do_Table:

       Replicate_Ignore_Table:

      Replicate_Wild_Do_Table:

  Replicate_Wild_Ignore_Table:

                   Last_Errno: 1051

                   Last_Error: Error 'Unknown table 'test.a'' on query. Default database: 'test'. Query: 'DROP TABLE `a` /* generated by server */'

                 Skip_Counter: 0

          Exec_Master_Log_Pos: 120

              Relay_Log_Space: 498471

              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: 1051

               Last_SQL_Error: Error 'Unknown table 'test.a'' on query. Default database: 'test'. Query: 'DROP TABLE `a` /* generated by server */'

  Replicate_Ignore_Server_Ids:

             Master_Server_Id: 6

                  Master_UUID: 02a05b2c-0557-11e7-bb02-000c29493a20

             Master_Info_File: /usr/local/mysql3307/log/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: 170719 15:35:08

               Master_SSL_Crl:

           Master_SSL_Crlpath:

           Retrieved_Gtid_Set:

            Executed_Gtid_Set:

                Auto_Position: 0

1 row in set (0.00 sec)

Slave_IO_Running: I/O线程是否启动并且成功连接到master
Slave_SQL_Running: SQL线程是否启动
Master_Log_File：I/O线程当前正在读取的主服务器二进制日志文件的名称
Read_Master_Log_Pos：在当前的主服务器二进制日志中，I/O线程已经读取的位置
Relay_Log_File：SQL线程当前正在读取和执行的中继日志文件的名称
Relay_Log_Pos：在当前的中继日志中，SQL线程已读取和执行的位置
Relay_Master_Log_File：包含SQL线程最近执行的事件的主服务器二进制日志文件的名称
Exec_Master_Log_Pos：在主服务器二进制日志中(Relay_Master_Log_File)，SQL线程已执行的位置。主服务器的二进制日志中的(Relay_Master_Log_File,Exec_Master_Log_Pos)对应于在中继日志中的(Relay_Log_File,Relay_Log_Pos)

从上面结果可知，SQL线程已经停止；SQL线程已经执行的主服务器二进制日志文件的名称mysql-bin.000001，SQL线程已执行的位置120
主库查看二进制日志

# master

mydba@192.168.85.129,3306:test> show binlog events in 'mysql-bin.000001';

+------------------+------+-------------+-----------+-------------+------------------------------------------------------------+

| Log_name         | Pos  | Event_type  | Server_id | End_log_pos | Info                                                       |

+------------------+------+-------------+-----------+-------------+------------------------------------------------------------+

| mysql-bin.000001 |    4 | Format_desc |         6 |         120 | Server ver: 5.6.35-log, Binlog ver: 4                      |

| mysql-bin.000001 |  120 | Query       |         6 |         234 | use `test`; DROP TABLE `a` /* generated by server */       |

| mysql-bin.000001 |  234 | Query       |         6 |         319 | use `test`; flush general logs                             |

| mysql-bin.000001 |  319 | Query       |         6 |         404 | use `test`; flush general logs                             |

| mysql-bin.000001 |  404 | Query       |         6 |         501 | use `test`; create table aaa(a int)                        |

| mysql-bin.000001 |  501 | Query       |         6 |         617 | use `test`; DROP TABLE `aaa` /* generated by server */     |

| mysql-bin.000001 |  617 | Query       |         6 |         737 | use `test`; DROP TABLE `bittest` /* generated by server */ |

| mysql-bin.000001 |  737 | Query       |         6 |         853 | use `test`; DROP TABLE `tb1` /* generated by server */     |

| mysql-bin.000001 |  853 | Query       |         6 |         969 | use `test`; DROP TABLE `tb2` /* generated by server */     |

| mysql-bin.000001 |  969 | Query       |         6 |        1086 | use `test`; DROP TABLE `test` /* generated by server */    |

| mysql-bin.000001 | 1086 | Query       |         6 |        1187 | use `test`; create table credro(id int)                    |

| mysql-bin.000001 | 1187 | Query       |         6 |        1306 | use `test`; DROP TABLE `credro` /* generated by server */  |

| mysql-bin.000001 | 1306 | Query       |         6 |        1407 | use `test`; create table credro(id int)                    |

| mysql-bin.000001 | 1407 | Query       |         6 |        1526 | use `test`; DROP TABLE `credro` /* generated by server */  |

| mysql-bin.000001 | 1526 | Stop        |         6 |        1549 |                                                            |

+------------------+------+-------------+-----------+-------------+------------------------------------------------------------+

15 rows in set (0.00 sec)

mydba@192.168.85.129,3306:test> show master logs;

+------------------+-----------+

| Log_name         | File_size |

+------------------+-----------+

| mysql-bin.000001 |      1549 |

| mysql-bin.000002 |       143 |

| mysql-bin.000003 |       143 |

| mysql-bin.000004 |    480108 |

| mysql-bin.000005 |       143 |

| mysql-bin.000006 |     14771 |

| mysql-bin.000007 |       120 |

+------------------+-----------+

7 rows in set (0.00 sec)

Log_name=mysql-bin.000001，Pos=120对应的是语句是use `test`; DROP TABLE `a`;其后还有很多操作语句。
由此可知，stop slave->reset slave->start slave 它的连接信息没有丢失，只是同步的起始位置发生了变化，之前执行过的操作还需再次执行导致同步异常。
为了后续操作直接使用change master到master status位置

# slave

mydba@192.168.85.129,3307:test> stop slave;

Query OK, 0 rows affected (0.01 sec)

mydba@192.168.85.129,3307:test> change master to

    -> master_host='192.168.85.129',

    -> master_port=3306,

    -> master_user='repl',

    -> master_password='repl',

    -> master_log_file='mysql-bin.000007',

    -> master_log_pos=120;

Query OK, 0 rows affected, 2 warnings (0.04 sec)

mydba@192.168.85.129,3307:test> start slave;

Query OK, 0 rows affected (0.02 sec)

reset slave all
首先来看下当前master-slave情况

# master

mydba@192.168.85.129,3306:test> show master status;

+------------------+----------+--------------+------------------+-------------------+

| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

+------------------+----------+--------------+------------------+-------------------+

| mysql-bin.000007 |      120 |              |                  |                   |

+------------------+----------+--------------+------------------+-------------------+

1 row in set (0.01 sec)

# slave

mydba@192.168.85.129,3307:test> show slave status\G

*************************** 1. row ***************************

               Slave_IO_State: Waiting for master to send event

                  Master_Host: 192.168.85.129

                  Master_User: repl

                  Master_Port: 3306

                Connect_Retry: 60

              Master_Log_File: mysql-bin.000007

          Read_Master_Log_Pos: 120

               Relay_Log_File: mysql-relay-bin.000002

                Relay_Log_Pos: 283

        Relay_Master_Log_File: mysql-bin.000007

             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: 120

              Relay_Log_Space: 456

              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: 6

                  Master_UUID: 02a05b2c-0557-11e7-bb02-000c29493a20

             Master_Info_File: /usr/local/mysql3307/log/master.info

                    SQL_Delay: 0

          SQL_Remaining_Delay: NULL

      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it

           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

1 row in set (0.00 sec)

此时主从处于同步状态，接着在从库上执行reset slave all，并查看同步情况

# slave

mydba@192.168.85.129,3307:test> stop slave;

Query OK, 0 rows affected (0.00 sec)

mydba@192.168.85.129,3307:test> reset slave all;

Query OK, 0 rows affected (0.01 sec)

mydba@192.168.85.129,3307:test> start slave;

ERROR 1200 (HY000): The server is not configured as slave; fix in config file or with CHANGE MASTER TO

使用change master to

mydba@192.168.85.129,3307:test> change master to

    -> master_host='192.168.85.129',

    -> master_port=3306,

    -> master_user='repl',

    -> master_password='repl',

    -> master_log_file='mysql-bin.000007',

    -> master_log_pos=120;

Query OK, 0 rows affected, 2 warnings (0.02 sec)

mydba@192.168.85.129,3307:test> start slave;

Query OK, 0 rows affected (0.01 sec)

参考网上的说法reset slave和reset slave all所做的操作如下
1、删除master.info和relay-log.info文件；
2、删除所有的relay log(包括还没有应用完的日志)，创建一个新的relay log文件；
如果不加all参数，那么所有的连接信息仍然保留在内存中，包括主库地址、端口、用户、密码等。这样可以直接运行start slave命令而不必重新输入change master to命令，而运行show slave status也仍和没有运行reset slave一样，有正常的输出(ShanFish补充：运行show slave status有输出，但里面的取值有变化，部分同步会出现异常)。但如果加了all参数，那么这些内存中的数据也会被清除掉，运行show slave status输出为空。
如果主服务器部分二进制日志删除(expire_logs_days)，比如mysql-bin.000001被删除，那么reset slave后再启动会指向哪个位置？

stop slave->reset slave->start slave 复制从哪个位置开始？reset slave all呢？的更多相关文章

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