MySQL Replication 遇到 error 1236 就有點(diǎn)麻煩了,通常都是 binlog 出問題造成的,Master 或 Slave 的 binlog 壞掉都有可能造成此錯誤.
通常遇到這個狀況,都是 Slave 的 binlog 壞掉,就 Slave DB 的資料重倒來解決,但是此次遇到是 Master 的 binlog 壞掉,就有點(diǎn)苦了.
錯誤訊息如下:
- ■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.003583' at 45997491, the last event read from './mysql-bin.003583' at 4, the last byte read from './mysql-bin.003583' at 4.'
MySQL Replication 遇到 Got fatal error 1236 from master 修復(fù):
mysql> SHOW SLAVE STATUSG
錯誤訊息如下:已經(jīng)把不必要得刪除.
- Master_Log_File: mysql-bin.003583
- Read_Master_Log_Pos: 45997491
- Relay_Log_File: mysqld-relay-bin.006789
- Relay_Log_Pos: 103569723
- Relay_Master_Log_File: mysql-bin.003361
- Slave_IO_Running: No
- Slave_SQL_Running: Yes
- Last_Errno: 0
- Skip_Counter: 0 --Vevb.com
- 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.003583' at 45997491, the last event read from './mysql-bin.003583' at 4, the last byte read from './mysql-bin.003583' at 4.'
?: Debian / Ubuntu Linux 預(yù)設(shè) MySQL data path: /var/lib/mysql,所以下述 binlog 可於此路徑尋找.
Slave binlog 壞掉的解法
1.一般常見是 Slave binlog 壞掉,所以都會先去 Slave 找 mysql-bin.003583 檔案.
2.再把 mysql-bin.003583 的資料用 mysqlbinlog dump 出來,指到下一個 position 即可.
3.Slave: ls /var/lib/mysql/mysql-bin.003583 # not found.
4.Slave 不存在檔案,才發(fā)現(xiàn)到壞的是 Master.
Master binlog 壞掉的解法
■Master: # mysqlbinlog /var/lib/mysql/mysql-bin.003583 > ~/3583
ERROR: Error in Log_event::read_log_event(): 'read error', data_len: 27, event_type: 16
■最苦的狀況是 Master 的 binlog 壞掉了,所以所有 Slave 都死光光,XD
此時可以考慮幾種作法:
1.全部 Slave 重倒 (最保險, no data lost)
2.先讓 Replication 可以啟動, 再來 重倒 / sync 一定需要同步的資料即可. (Cache ... 那種就可以不用理他).
解決實例代碼如下:
- mysql> STOP SLAVE;
- mysql> CHANGE MASTER TO master_log_file = 'mysql-bin.003584', master_log_pos = 0; # 先指到下一個 binlog 檔, pos 指 0 或 4, 都是一樣意思.
- mysql> START SLAVE;
- mysql> SHOW SLAVE STATUS G # 於此應(yīng)該就恢復(fù)了.
然后在對重要的 Table 用 pt-table-sync 來補(bǔ)一補(bǔ)即可,apt-get install percona-toolkit.
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