MySQL 複製恢復

主伺服器崩潰後，我無法同步從伺服器。您能否告知是否可以恢復（沒有數據/事務失去）或者我是否必須創建一個新的從伺服器？

請注意，在此錯誤之後我彎下腰：

mysql> SHOW SLAVE STATUS \G
*************************** 1. row ***************************
              Slave_IO_State: 
                 Master_Host: 192.168.1.1
                 Master_User: slave
                 Master_Port: 3306
               Connect_Retry: 60
             Master_Log_File: mysql-bin.000010
         Read_Master_Log_Pos: 940132528
              Relay_Log_File: cb1s-relay-bin.000001
               Relay_Log_Pos: 4
       Relay_Master_Log_File: mysql-bin.000010
            Slave_IO_Running: No
           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: 0
                  Last_Error: 
                Skip_Counter: 0
         Exec_Master_Log_Pos: 940132528
             Relay_Log_Space: 107
             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: 'Client requested master to start replication from impossible position; the first event 'mysql-bin.000010' at 940132528, the last event read from './mysql-bin.000010' at 4, the last byte read from './mysql-bin.000010' at 4.'
              Last_SQL_Errno: 0
              Last_SQL_Error: 
 Replicate_Ignore_Server_Ids: 
            Master_Server_Id: 1
1 row in set (0.00 sec)

日誌：

120711 13:04:24 [Note] Slave I/O thread: connected to master 'user@192.168.1.1:3306',replication started in log 'mysql-bin.000010' at position 940132528
120711 13:04:24 [ERROR] Error reading packet from server: Client requested master to start replication from impossible position; the first event 'mysql-bin.000010' at 940132528, the last event read from './mysql-bin.000010' at 4, the last byte read from './mysql-bin.000010' at 4. ( server_errno=1236)
120711 13:04:24 [ERROR] Slave I/O: Got fatal error 1236 from master when reading data from binary log: 'Client requested master to start replication from impossible position; the first event 'mysql-bin.000010' at 940132528, the last event read from './mysql-bin.000010' at 4, the last byte read from './mysql-bin.000010' at 4.', Error_code: 1236
120711 13:04:24 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000010', position 940132528
120711 13:04:24 [Note] Slave SQL thread initialized, starting replication in log 'mysql-bin.000010' at position 940132528, relay log './cb1s-relay-bin.000026' position: 940132674
120711 13:05:08 [Note] Error reading relay log event: slave SQL thread was killed
120711 13:06:20 [Note] Slave SQL thread initialized, starting replication in log 'mysql-bin.000010' at position 940132528, relay log './cb1s-relay-bin.000027' position: 4

您不必創建新的從站。您只需要重放主伺服器的數據並重新設置從伺服器（CHANGE MASTER TO ...）上的複制座標，如MySQL 文件中所述。

通過在 mysqldump 呼叫中指定–master-data=2選項，您可以在不停止數據庫的情況下從主伺服器上獲取數據- 這會將轉儲的複制座標寫入mysqldump輸出。

請注意，執行 mysqldump仍然可能意味著數據庫支持的應用程序的停機時間，因為在轉儲期間所有表都將被讀鎖定。

另一種選擇是按照David Schwartz 在對您的問題的評論中建議的那樣重置複製座標，並使用Percona 工具包中的 pt-table-sync 將所有表的數據重播到從屬設備以確保完整性。

引用自：https://serverfault.com/questions/406761