MySQL Replication 遇到 Got fatal error 1236 from master 修复

MySQL Replication 遇到 error 1236 就有点麻烦了~ 通常都是 binlog 出问题造成的~ (Master 或 Slave 的 binlog 坏掉都有可能造成此错误)

通常遇到这个状况, 都是 Slave 的 binlog 坏掉, 就 Slave DB 的资料重倒来解决, 但是此次遇到是 Master 的 binlog 坏掉, 就有点苦了~

错误讯息如下:

  • 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 修复

mysql> SHOW SLAVE STATUS\G

错误讯息如下: (已经把不必要得删除)

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
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.'

注: Debian / Ubuntu Linux 默认 MySQL data path: /var/lib/mysql, 所以下述 binlog 可于此路径寻找.

Slave binlog 坏掉的解法

  1. 一般常见是 Slave binlog 坏掉, 所以都会先去 Slave 找 mysql-bin.003583 档案.
  2. 再把 mysql-bin.003583 的资料用 mysqlbinlog dump 出来, 指到下一个 position 即可.
  3. Slave: ls /var/lib/mysql/mysql-bin.003583 # not found.
  4. Slave 不存在档案, 才发现到坏的是 Master.

Master binlog 坏掉的解法

  • 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

  • 最苦的状况是 Master 的 binlog 坏掉了, 所以所有 Slave 都死光光. XD

此时可以考虑几种作法:

  1. 全部 Slave 重倒 (最保险, no data lost)
  2. 先让 Replication 可以启动, 再来 重倒 / sync 一定需要同步的资料即可. (Cache ... 那种就可以不用理他)

下面是采用第二种作法:

  1. mysql> STOP SLAVE;
  2. mysql> CHANGE MASTER TO master_log_file = 'mysql-bin.003584', master_log_pos = 0; # 先指到下一个 binlog 档, pos 指 0 或 4, 都是一样意思.
  3. mysql> START SLAVE;
  4. mysql> SHOW SLAVE STATUS \G # 于此应该就恢复了.
  5. 然后在对重要的 Table 用 pt-table-sync 来补一补即可. (apt-get install percona-toolkit)

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