Mysql 主主复制失败


Mysql 主主复制失败



故障描述

原因描述 因为机柜PDU老化, 导致整个机柜掉电.
故障时间 20160923-10:09
发现时间 20160929-13:56

架构信息

Tomcat Memcache Keepalive Mysql主主复制

节点信息

序号 节点名称 IP地址 报错信息
1 aipprd1 10.66.1.52 Got fatal error 1236 from master when reading data from binary log: ‘binlog truncated in the middle of event; consider out of disk space on master; the first event ‘mysql-bin.000084’ at 91941417, the last event read from ‘/aip/mysql/data/log/mysql-bin.000084’ at 91941783, the last byte read from ‘/aip/mysql/data/log/mysql-bin.000084’ at 91942912.’
2 aipprd2 10.66.1.51 Got fatal error 1236 from master when reading data from binary log: ‘binlog truncated in the middle of event; consider out of disk space on master; the first event ‘mysql-bin.000082’ at 6369026, the last event read from ‘/aip/mysql/data/log/mysql-bin.000082’ at 6369026, the last byte read from ‘/aip/mysql/data/log/mysql-bin.000082’ at 6369280.’

故障分析

  • 由于Zabbix的Mysql监控脚本的缘故, 没有触发事件, 所以直至20160929检查Zabbix日志的时候, 才发现该故障, 当时KeepaliveVIPaipprd1上, 这个节点上, 数据库是对外服务的;
  • 那么首先以aipprd1为主, 先将aipprd2的从环境同步起来;
  • aipprd2从环境同步完成后, 再将aipprd1的从环境同步起来.

同步AIPPRD2的从环境

  • 检查aipprd2的Slave状态
    根据代码区的描述, Last_Errno的错误代码为1062, 需要手动修改Position.

    [root@aipprd2 ~]# mysql -uzabbixmoniter -ppassw0rd -hlocalhost -e "show slave status\G;"
    *************************** 1. row ***************************
    Slave_IO_State:
    Master_Host: 10.66.1.52
    Master_User: root
    Master_Port: 3388
    Connect_Retry: 60
    Master_Log_File: mysql-bin.000082
    Read_Master_Log_Pos: 6369026
    Relay_Log_File: mysql-relay-bin.000257
    Relay_Log_Pos: 8999
    Relay_Master_Log_File: mysql-bin.000082
    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: 1062
    Last_Error: Error 'Duplicate entry '93FF91EF92866D23E80E4A57D55ED538-n1.tomcat604' for key 'PRIMARY'' on query. Default database: 'aipprd'. Query: 'INSERT INTO eahttpsession ( sessionid, username, account, createtime, loginip,userid,explorer,userDomain,computerName,computerUserName) VALUES ('93FF91EF92866D23E80E4A57D55ED538-n1.tomcat604', '李花', 'XS003_4200', '2016-09-23 12:10:33', , '10752920','MSIE 7.0','','','')'
    Skip_Counter: 0
    Exec_Master_Log_Pos: 6367510
    Relay_Log_Space: 11099
    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: 'binlog truncated in the middle of event; consider out of disk space on master; the first event 'mysql-bin.000082' at 6369026, the last event read from '/aip/mysql/data/log/mysql-bin.000082' at 6369026, the last byte read from '/aip/mysql/data/log/mysql-bin.000082' at 6369280.'
    Last_SQL_Errno: 1062
    Last_SQL_Error: Error 'Duplicate entry '93FF91EF92866D23E80E4A57D55ED538-n1.tomcat604' for key 'PRIMARY'' on query. Default database: 'aipprd'. Query: 'INSERT INTO eahttpsession ( sessionid, username, account, createtime, loginip,userid,explorer,userDomain,computerName,computerUserName) VALUES ('93FF91EF92866D23E80E4A57D55ED538-n1.tomcat604', '李花', 'XS003_4200', '2016-09-23 12:10:33', , '10752920','MSIE 7.0','','','')'
    Replicate_Ignore_Server_Ids:
    Master_Server_Id: 1
  • aipprd2上按照Last_IO_Error中的PosfilePos修改.
    按照报错给出的提示PosfilePos修改后, 报错依旧.

    mysql> slave stop;
    mysql> CHANGE MASTER TO master_host='10.66.1.52', master_port=3388, master_user='root', master_password='passw0rd', master_log_file='mysql-bin.000082', master_log_pos=6369026;
    mysql> slave start;
  • aipprd2检查Mysql的日志
    Mysql的日志中记录了Crash开始的时间, 并给出了建议, Fix the problem, and restart the slave SQL thread with "SLAVE START". We stopped at log 'mysql-bin.000082' position 6367510

    160923 12:35:22 [Note] Starting crash recovery...
    160923 12:35:22 [Note] Crash recovery finished.
    160923 12:36:27 [ERROR] Error running query, slave SQL thread aborted. Fix the problem, and restart the slave SQL thread with "SLAVE START". We stopped at log 'mysql-bin.000082' position 6367510
  • aipprd2上按照日志中建议的PosfilePos修改.
    按照日志中建议的PosfilePos修改后, 报错依旧.

    mysql> slave stop;
    mysql> CHANGE MASTER TO master_host='10.66.1.52', master_port=3388, master_user='root', master_password='passw0rd', master_log_file='mysql-bin.000082', master_log_pos=6367510;
    mysql> slave start;
  • aipprd1上检查posfile
    首先检查show slave status\G;中给出的pos, 发现日志中根本不存在.

    [root@aipprd1 log]# mysqlbinlog --no-defaults --start-position=6369026 mysql-bin.000083 
    /*!40019 SET @@session.max_insert_delayed_threads=0*/;
    /*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
    DELIMITER /*!*/;

    # at 4


    #160923 12:38:59 server id 1 end_log_pos 107 Start: binlog v 4, server v 5.5.24-log created 160923 12:38:59 at startup

    ROLLBACK/*!*/;
    BINLOG '
    47HkVw8BAAAAZwAAAGsAAAAAAAQANS41LjI0LWxvZwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAADjseRXEzgNAAgAEgAEBAQEEgAAVAAEGggAAAAICAgCAA==
    '/*!*/;
    ERROR: Error in Log_event::read_log_event(): 'read error', data_len: 912208946, event_type: 71
    ERROR: Could not read entry at offset 6369026: Error in log format or read error.
    DELIMITER

    # End of log file

    ROLLBACK /* added by mysqlbinlog */;
    /*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;

    此后检查Mysql日志中建议的pos, 发现posfile中是存在此记录的, 而此posfile的最后一个pos6368660, 而show slave status\G;pos6369026, 显然不存在日志文件中.

    [root@aipprd1 log]# mysqlbinlog --no-defaults --start-position=6367510 mysql-bin.000082 
    /*!40019 SET @@session.max_insert_delayed_threads=0*/;
    /*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
    DELIMITER /*!*/;

    # at 4


    #160923 10:39:15 server id 1 end_log_pos 107 Start: binlog v 4, server v 5.5.24-log created 160923 10:39:15 at startup


    # Warning: this binlog is either in use or was not closed properly.

    ROLLBACK/*!*/;
    BINLOG '
    05XkVw8BAAAAZwAAAGsAAAABAAQANS41LjI0LWxvZwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAADTleRXEzgNAAgAEgAEBAQEEgAAVAAEGggAAAAICAgCAA==
    '
    /*!*/;
    # at 6367510
    # at 6367585
    # at 6367963
    # at 6367990
    # at 6368073
    # at 6368163
    # at 6368275
    # at 6368358
    # at 6368558
    # at 6368585
    # at 6368660
    # End of log file
    ROLLBACK /* added by mysqlbinlog */;
    /*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;

    最后在mysql-bin.000083中检查show slave status\G;提示pos:6369026, 也不存在.

    [root@aipprd1 log]# mysqlbinlog --no-defaults --start-position=6369026 mysql-bin.000083 
  • aipprd2上重新发起修改posfilepos操作
    检查aipprd1上的日志, 既然mysql-bin.000082日志末不存在pos:6369026, 且mysql-bin.000083为下一个日志, 那么重新发起修改posfilepos的操作.

    [root@aipprd1 log]# ll
    total 526908
    -rw-rw---- 1 mysql mysql 104858346 Sep 19 23:04 mysql-bin.000079
    -rw-rw---- 1 mysql mysql 104859112 Sep 22 13:01 mysql-bin.000080
    -rw-rw---- 1 mysql mysql 42558345 Sep 23 10:23 mysql-bin.000081
    -rw-rw---- 1 mysql mysql 6369280 Sep 23 12:13 mysql-bin.000082
    -rw-rw---- 1 mysql mysql 104857953 Sep 26 15:02 mysql-bin.000083
    -rw-rw---- 1 mysql mysql 70844542 Sep 27 17:42 mysql-bin.000084
    -rw-rw---- 1 mysql mysql 104858026 Sep 29 15:48 mysql-bin.000085
    -rw-rw---- 1 mysql mysql 297019 Sep 29 15:54 mysql-bin.000086
    -rw-rw---- 1 mysql mysql 296 Sep 29 15:48 mysql-bin.log.index
    -rw-rw---- 1 mysql mysql 107 Sep 27 18:05 mysql-relay-bin.000182
    -rw-rw---- 1 mysql mysql 43 Sep 27 18:05 mysql-relay-bin.index

    重新修改posfilemysql-bin.000083, pos0, 启动Slave后, 现在同步正常.

    mysql> slave stop;
    mysql> CHANGE MASTER TO master_host='10.66.1.52', master_port=3388, master_user='root', master_password='passw0rd', master_log_file='mysql-bin.000083', master_log_pos=0;
    mysql> slave start;
    mysql> show slave status\G;
    *************************** 1. row ***************************
    Slave_IO_State: Waiting for master to send event
    Master_Host: 10.66.1.52
    Master_User: root
    Master_Port: 3388
    Connect_Retry: 60
    Master_Log_File: mysql-bin.000086
    Read_Master_Log_Pos: 18585
    Relay_Log_File: mysql-relay-bin.000002
    Relay_Log_Pos: 8119286
    Relay_Master_Log_File: mysql-bin.000083
    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: 8119140
    Relay_Log_Space: 280580804
    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: 521370
    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: 1
    1 row in set (0.00 sec)
  • 在同步的过程中, 发现有几个Last_SQL_Error: Error ‘Duplicate entry 1026SQL Error, 这个是因为重复主键导致Slave停止工作, 执行以下操作解决(如果有多条重复的主键, 需要执行多次):

    mysql> slave stop;
    mysql> set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;
    mysql> slave start;

    还有另一种办法就是修改mysql配置文件/etc/my.cnf[mysqld]下加一行slave_skip_errors = 1062 ,保存后重启mysql, mysql slave可以正常同步了.


同步AIPPRD1的从环境

  • 检查aipprd1的Slave状态

    mysql> show slave status\G;
    *************************** 1. row ***************************
    Slave_IO_State:
    Master_Host: 10.66.1.51
    Master_User: root
    Master_Port: 3388
    Connect_Retry: 60
    Master_Log_File: mysql-bin.000084
    Read_Master_Log_Pos: 91941783
    Relay_Log_File: mysql-relay-bin.000002
    Relay_Log_Pos: 296
    Relay_Master_Log_File: mysql-bin.000084
    Slave_IO_Running: No
    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: 91941783
    Relay_Log_Space: 452
    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: 'binlog truncated in the middle of event; consider out of disk space on master; the first event 'mysql-bin.000084' at 91941417, the last event read from '/aip/mysql/data/log/mysql-bin.000084' at 91941783, the last byte read from '/aip/mysql/data/log/mysql-bin.000084' at 91942912.'
    Last_SQL_Errno: 0
    Last_SQL_Error:
    Replicate_Ignore_Server_Ids:
    Master_Server_Id: 2
    1 row in set (0.00 sec)
  • aipprd2上检查日志文件
    aipprd1上检查show slave status\G;后, 提示需要修改posfile为mysql-bin.000084pos91942912, 因为在aipprd2同步完成后, 实际同步的数据是从aipprd1过来的, 这些数据在aipprd1上本身就存在的.

    [root@aipprd2 log]# ll
    total 653832
    -rw-rw---- 1 mysql mysql 104857774 Sep 21 13:12 mysql-bin.000083
    -rw-rw---- 1 mysql mysql 91942912 Sep 23 10:21 mysql-bin.000084
    -rw-rw---- 1 mysql mysql 6295552 Sep 23 12:10 mysql-bin.000085
    -rw-rw---- 1 mysql mysql 8250 Sep 27 17:39 mysql-bin.000086
    -rw-rw---- 1 mysql mysql 104858014 Sep 29 17:20 mysql-bin.000087
    -rw-rw---- 1 mysql mysql 104857971 Sep 29 19:18 mysql-bin.000088
    -rw-rw---- 1 mysql mysql 55744926 Sep 29 20:23 mysql-bin.000089
    -rw-rw---- 1 mysql mysql 259 Sep 29 19:18 mysql-bin.log.index
    -rw-rw---- 1 mysql mysql 70844718 Sep 29 15:35 mysql-relay-bin.000005
    -rw-rw---- 1 mysql mysql 104857729 Sep 29 15:44 mysql-relay-bin.000006
    -rw-rw---- 1 mysql mysql 708 Sep 29 15:44 mysql-relay-bin.000007
    -rw-rw---- 1 mysql mysql 199 Sep 29 15:44 mysql-relay-bin.000008
    -rw-rw---- 1 mysql mysql 25188420 Sep 30 08:40 mysql-relay-bin.000009
    -rw-rw---- 1 mysql mysql 215 Sep 29 18:42 mysql-relay-bin.index

    aipprd2上检查show master status;后, 记录Posfilemysql-bin.000089, 既然aipprd1的数据为最新的, 且aipprd2已经从aipprd1后同步完成了(通过检查show slave status\G;中的Seconds_Behind_Master:, 如果此项值很小, 应该是同步完成了.), 那么两边的数据应该差不多的.

    mysql> show master status;
    +------------------+-----------+--------------+------------------+

    | File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
    +------------------+-----------+--------------+------------------+

    | mysql-bin.000089 | 104341982 | | |
    +------------------+-----------+--------------+------------------+

    1 row in set (0.00 sec)
  • aipprd1上发起修改posfilepos操作
    所以在此用posfilemysql-bin.000089pos0来修改, 启动Slave后, 开始同步.

    mysql> slave stop;
    Query OK, 0 rows affected (0.11 sec)
    mysql> CHANGE MASTER TO master_host='10.66.1.51', master_port=3388, master_user='root', master_password='passw0rd', master_log_file='mysql-bin.000089', master_log_pos=0;
    Query OK, 0 rows affected (0.06 sec)
    mysql> slave start;
    Query OK, 0 rows affected (0.00 sec)
    mysql> show slave status\G;
    *************************** 1. row ***************************
    Slave_IO_State: Waiting for master to send event
    Master_Host: 10.66.1.51
    Master_User: root
    Master_Port: 3388
    Connect_Retry: 60
    Master_Log_File: mysql-bin.000089
    Read_Master_Log_Pos: 55744926
    Relay_Log_File: mysql-relay-bin.000002
    Relay_Log_Pos: 253
    Relay_Master_Log_File: mysql-bin.000089
    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: 55744926
    Relay_Log_Space: 409
    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: 2
    1 row in set (0.00 sec)


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