MySQL5.7.19-レプリケーションのオンライン変更-ログからトランザクションへ

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ログ gtid 事務コピー mysql

【事前説明】

MasterとSlaveは並列に動作する必要があります.すなわち、MasterとSlaveの最初のステップが完了した後、第2のステップを実行することができます.

ステップ毎に、Masterを先に実行するかSlaveを先に実行するかは、要求されていない.

【Master - Lebron - 192.168.1.122】
Masterバージョンが5.7.6より大きいかどうかを確認します.

mysql> show variables like 'version';
+---------------+------------+
| Variable_name | Value      |
+---------------+------------+
| version       | 5.7.19-log |
+---------------+------------+
1 row in set (0.00 sec)

Masterのgtid_をチェックmodeがoffかどうか

mysql> show variables like 'gtid_mode';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| gtid_mode     | OFF   |
+---------------+-------+
1 row in set (0.00 sec)

最初のステップ

mysql> set @@global.enforce_gtid_consistency=warn;
Query OK, 0 rows affected (0.00 sec)

mysqlを終了し、エラーログを表示し、エラーがないことを確認します.

mysql> quit
Bye
[root@lebron sysconfig]# tail -f /var/log/mysqld.log
Version: '5.7.19-log'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MySQL Community Server (GPL)
2017-12-10T15:29:40.557075Z 0 [Note] Executing 'SELECT * FROM INFORMATION_SCHEMA.TABLES;' to get a list of tables using the deprecated partition engine. You may use the startup option '--disable-partition-engine-check' to skip this check. 
2017-12-10T15:29:40.557077Z 0 [Note] Beginning of list of non-natively partitioned tables
2017-12-10T15:29:40.564129Z 0 [Note] End of list of non-natively partitioned tables
2017-12-10T15:29:41.171276Z 3 [Note] Access denied for user 'UNKNOWN_MYSQL_USER'@'localhost' (using password: NO)
2017-12-10T17:20:10.601941Z 6 [Warning] IP address '192.168.1.123' could not be resolved: Name or service not known
2017-12-10T17:34:27.796701Z 10 [Note] Start binlog_dump to master_thread_id(10) slave_server(100), pos(mysql-bin.000001, 154)
2017-12-10T17:39:27.813157Z 11 [Note] While initializing dump thread for slave with UUID , found a zombie dump thread with the same UUID. Master is killing the zombie dump thread(10).
2017-12-10T17:39:27.813305Z 11 [Note] Start binlog_dump to master_thread_id(11) slave_server(100), pos(mysql-bin.000001, 154)
2017-12-10T19:01:14.798790Z 12 [Note] Changed ENFORCE_GTID_CONSISTENCY from OFF to WARN.

ステップ2

mysql> set @@global.enforce_gtid_consistency=on;
Query OK, 0 rows affected (0.00 sec)

ステップ3

mysql> set @@global.gtid_mode=off_permissive;
Query OK, 0 rows affected (0.02 sec)

mysqlを終了し、エラーログを表示し、エラーがないことを確認します.

mysql> quit
Bye
[root@lebron sysconfig]# tail -f /var/log/mysqld.log
2017-12-10T15:29:40.557077Z 0 [Note] Beginning of list of non-natively partitioned tables
2017-12-10T15:29:40.564129Z 0 [Note] End of list of non-natively partitioned tables
2017-12-10T15:29:41.171276Z 3 [Note] Access denied for user 'UNKNOWN_MYSQL_USER'@'localhost' (using password: NO)
2017-12-10T17:20:10.601941Z 6 [Warning] IP address '192.168.1.123' could not be resolved: Name or service not known
2017-12-10T17:34:27.796701Z 10 [Note] Start binlog_dump to master_thread_id(10) slave_server(100), pos(mysql-bin.000001, 154)
2017-12-10T17:39:27.813157Z 11 [Note] While initializing dump thread for slave with UUID , found a zombie dump thread with the same UUID. Master is killing the zombie dump thread(10).
2017-12-10T17:39:27.813305Z 11 [Note] Start binlog_dump to master_thread_id(11) slave_server(100), pos(mysql-bin.000001, 154)
2017-12-10T19:01:14.798790Z 12 [Note] Changed ENFORCE_GTID_CONSISTENCY from OFF to WARN.
2017-12-10T19:05:50.369256Z 13 [Note] Changed ENFORCE_GTID_CONSISTENCY from WARN to ON.
2017-12-10T19:09:01.626528Z 13 [Note] Changed GTID_MODE from OFF to OFF_PERMISSIVE.

ステップ4

mysql> set @@global.gtid_mode=on_permissive;
Query OK, 0 rows affected (0.02 sec)

設定結果を表示

mysql> show variables like 'gtid_mode';
+---------------+---------------+
| Variable_name | Value         |
+---------------+---------------+
| gtid_mode     | ON_PERMISSIVE |
+---------------+---------------+
1 row in set (0.00 sec)

ステップ5-Masterは操作せず、Slaveでログベースのコピーが完了したかどうかを確認します.
ステップ6

mysql> set @@global.gtid_mode=on;
Query OK, 0 rows affected (0.02 sec)

ステップ7～10-Masterに操作なし
【Slave - Kyrie - 192.168.1.123】
Slaveバージョンが5.7.6より大きいかどうかを確認します.

mysql> show variables like 'version';
+---------------+------------+
| Variable_name | Value      |
+---------------+------------+
| version       | 5.7.19-log |
+---------------+------------+
1 row in set (0.00 sec)

Slaveのgtid_をチェックmodeがoffかどうか

mysql> show variables like 'gtid_mode';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| gtid_mode     | OFF   |
+---------------+-------+
1 row in set (0.00 sec)

最初のステップ

mysql> set @@global.enforce_gtid_consistency=warn;
Query OK, 0 rows affected (0.00 sec)

ステップ2

mysql> set @@global.enforce_gtid_consistency=on;
Query OK, 0 rows affected (0.00 sec)

ステップ3

mysql> set @@global.gtid_mode=off_permissive;
Query OK, 0 rows affected (0.02 sec)

mysqlを終了し、エラーログを表示し、エラーがないことを確認します.

mysql> quit
Bye
[root@lebron sysconfig]# tail -f /var/log/mysqld.log
2017-12-10T15:29:40.557077Z 0 [Note] Beginning of list of non-natively partitioned tables
2017-12-10T15:29:40.564129Z 0 [Note] End of list of non-natively partitioned tables
2017-12-10T15:29:41.171276Z 3 [Note] Access denied for user 'UNKNOWN_MYSQL_USER'@'localhost' (using password: NO)
2017-12-10T17:20:10.601941Z 6 [Warning] IP address '192.168.1.123' could not be resolved: Name or service not known
2017-12-10T17:34:27.796701Z 10 [Note] Start binlog_dump to master_thread_id(10) slave_server(100), pos(mysql-bin.000001, 154)
2017-12-10T17:39:27.813157Z 11 [Note] While initializing dump thread for slave with UUID , found a zombie dump thread with the same UUID. Master is killing the zombie dump thread(10).
2017-12-10T17:39:27.813305Z 11 [Note] Start binlog_dump to master_thread_id(11) slave_server(100), pos(mysql-bin.000001, 154)
2017-12-10T19:01:14.798790Z 12 [Note] Changed ENFORCE_GTID_CONSISTENCY from OFF to WARN.
2017-12-10T19:05:50.369256Z 13 [Note] Changed ENFORCE_GTID_CONSISTENCY from WARN to ON.
2017-12-10T19:09:01.626528Z 13 [Note] Changed GTID_MODE from OFF to OFF_PERMISSIVE.

ステップ4

mysql> set @@global.gtid_mode=on_permissive;
Query OK, 0 rows affected (0.02 sec)

設定結果を表示

mysql> show variables like 'gtid_mode';
+---------------+---------------+
| Variable_name | Value         |
+---------------+---------------+
| gtid_mode     | ON_PERMISSIVE |
+---------------+---------------+
1 row in set (0.00 sec)

ステップ5-MasterのデータがSlaveに同期しているかどうかを確認し、Emptyは同期していることを示します.

匿名レプリケーション、すなわちgtid以外のすべてのレプリケーション、すなわちログベースのレプリケーション.

結果が空でない場合、結果が空になるまで操作を続行します.

mysql> show status like 'ongoing_anonymouse_transaction_count';
Empty set (0.00 sec)

ステップ6

mysql> set @@global.gtid_mode=on;
Query OK, 0 rows affected (0.02 sec)

ステップ7

mysql> stop slave;
Query OK, 0 rows affected (0.01 sec)

ステップ8

mysql> change master to master_auto_position=1;
Query OK, 0 rows affected (0.01 sec)

ステップ9

mysql> start slave;
Query OK, 0 rows affected (0.01 sec)

ステップ10

マスタースレーブ間で同期が発生した場合、Retrieved_Gtid_Set & Executed_Gtid_Setこそ価値がある.

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.1.122
                  Master_User: lxl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000004
          Read_Master_Log_Pos: 420
               Relay_Log_File: lebron-relay-bin.000002
                Relay_Log_Pos: 633
        Relay_Master_Log_File: mysql-bin.000004
             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: 420
              Relay_Log_Space: 841
              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: 1
                  Master_UUID: a41e6957-dc02-11e7-a9aa-0800271c6804
             Master_Info_File: /var/lib/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 
     Last_SQL_Error_Timestamp: 
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: a41e6957-dc02-11e7-a9aa-0800271c6804:1
            Executed_Gtid_Set: a41e6957-dc02-11e7-a9aa-0800271c6804:1
                Auto_Position: 1
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)

ERROR: 
No query specified

に注意
global.enforce_gtid_consistency=on & global.gtid_mode=onをmyに設定します.cnfでは,次回サービスを開始するとgtid方式でレプリケーションが完了する.

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