MySQL5.7不停業務將傳統複製變動爲GTID複製

 
因爲GTID的優點,咱們須要將傳統基於file-pos的複製更改成基於GTID的複製,如何在線變動成爲咱們關心的一個點,以下爲具體的方法:
目前咱們有一個傳統複製下的M-S結構:
port 3301 master
port 3302 slave
master上(3301):
[zejin] 3301>select * from t_users;
+----+------+
| id | name |
+----+------+
| 1 | hao |
| 2 | zhou |
+----+------+
2 rows in set (0.00 sec)
 
 
slave上(3302):
[zejin] 3302>show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.240
Master_User: repl
Master_Port: 3301
Connect_Retry: 60
Master_Log_File: binlog57.000002
Read_Master_Log_Pos: 417
Relay_Log_File: zejin240-relay-bin.000004
Relay_Log_Pos: 628
Relay_Master_Log_File: binlog57.000002
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: 417
Relay_Log_Space: 884
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: 3301
Master_UUID: a97983fc-5a29-11e6-9d28-000c29d4dc3f
Master_Info_File: /home/mysql/I3302/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:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
 
[zejin] 3302>select * from t_users;
+----+------+
| id | name |
+----+------+
| 1 | hao |
| 2 | zhou |
+----+------+
2 rows in set (0.00 sec)

 

 
以下爲在線變動的具體的操做步驟:
前提:
1.要求全部的mysql版本5.7.6或更高的版本。
2.目前拓撲結構中全部的mysql的gtid_mode的值爲off狀態。
3.以下的操做步驟都是有序的,不要跳躍着進行。
 
補充一下全局系統變量GTID_MODE變量值說明:

    OFF                       新事務是非GTID,  Slave只接受不帶GTID的事務,傳送來GTID的事務會報錯
    OFF_PERMISSIVE    新事務是非GTID,  Slave即接受不帶GTID的事務也接受帶GTID的事務
    ON_PERMISSIVE     新事務是GTID,  Slave即接受不帶GTID的事務也接受帶GTID的事務
    ON                        新事務是GTID,  Slave只接受帶GTID的事務

須要注意的是,這幾個值的改變是有順序的,即mysql

off<--->OFF_PERMISSIVE<--->ON_PERMISSIVE<--->ON
不能跳躍執行,會報錯。sql

 

 
 
step1:在每一個mysql實例上,將 ENFORCE_GTID_CONSISTENCY設置爲warning,哪臺先執行不影響結果。
[zejin] 3302>set @@global.enforce_gtid_consistency=warn;
Query OK, 0 rows affected (0.00 sec)
[zejin] 3301>set @@global.enforce_gtid_consistency=warn;
Query OK, 0 rows affected (0.00 sec)
 
注意:執行完這條語句後,若是出現GTID不兼容的語句用法,在錯誤日誌會記錄相關信息,那麼須要調整應該程序避免不兼容的寫法, 直到徹底沒有產生不兼容的語句,能夠經過應該程序去排查全部的sql,也能夠設置後觀察錯誤日誌一段時間, 這一步很是重要
 
 
step2:在每一個mysql實例上,設置 ENFORCE_GTID_CONSISTENCY爲ON,哪臺先執行不影響結果
在第一步完成後,就能夠將值設置爲on。
[zejin] 3301>set @@global.enforce_gtid_consistency=on;
Query OK, 0 rows affected (0.03 sec)
 
[zejin] 3302>set @@global.enforce_gtid_consistency=on;
Query OK, 0 rows affected (0.00 sec)

 

 
step3:在每一個mysql實例上,設置GTID_MODE爲off_permissiv; 哪臺先執行不影響結果
[zejin] 3301>SET @@GLOBAL.GTID_MODE = OFF_PERMISSIVE;
Query OK, 0 rows affected (0.00 sec)
 
[zejin] 3302>SET @@GLOBAL.GTID_MODE = OFF_PERMISSIVE;
Query OK, 0 rows affected (0.00 sec)

 

 
step4:在每一個mysql實例上,設置GTID_MODE爲on_permissiv;; 哪臺先執行不影響結果
[zejin] 3302>SET @@GLOBAL.GTID_MODE = on_permissive;
Query OK, 0 rows affected (0.00 sec)
[zejin] 3301>SET @@GLOBAL.GTID_MODE = on_permissive;
Query OK, 0 rows affected (0.01 sec)

 

 
step5:在每一個mysql實例上檢查變量 ONGOING_ANONYMOUS_TRANSACTION_COUNT
[zejin] 3301>SHOW STATUS LIKE 'ONGOING_ANONYMOUS_TRANSACTION_COUNT';
+-------------------------------------+-------+
| Variable_name                       | Value |
+-------------------------------------+-------+
| Ongoing_anonymous_transaction_count | 0     |
+-------------------------------------+-------+
1 row in set (0.02 sec)
 
 
[zejin] 3302>SHOW STATUS LIKE 'ONGOING_ANONYMOUS_TRANSACTION_COUNT';
+-------------------------------------+-------+
| Variable_name                       | Value |
+-------------------------------------+-------+
| Ongoing_anonymous_transaction_count | 0     |
+-------------------------------------+-------+
1 row in set (0.02 sec)
 
須要等到此變量爲0
 
 
step6:確保全部的匿名事務(非GTID事務)已經被徹底複製到全部的server上。
檢查方法:
在master上:
[zejin] 3301>show master status;
+-----------------+----------+--------------+------------------+-------------------+
| File            | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-----------------+----------+--------------+------------------+-------------------+
| binlog57.000005 |      154 |              |                  |                   |
+-----------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
 
 
在slave上,
 
[zejin] 3302>show slave status\G
*************************** 1. row ***************************
……
        Relay_Master_Log_File: binlog57.000005
          Exec_Master_Log_Pos: 154
……
檢查這兩項Relay_Master_Log_File的值大於binlog57.000005,
或者等於Relay_Master_Log_File等於binlog57.000005而且Exec_Master_Log_Pos的值大於等於154便可
 
 
或者slave直接用函數:
[zejin] 3302>SELECT MASTER_POS_WAIT('binlog57.000005', 154);
+-----------------------------------------+
| MASTER_POS_WAIT('binlog57.000005', 154) |
+-----------------------------------------+
|                                       0 |
+-----------------------------------------+
1 row in set (0.00 sec)
 返回結果大於等於0就說明匿名事務已經所有複製完成
 
 
step7: 確認整個拓撲結構中已經沒有匿名事務的存在,如以前產生的全部匿名事務已經所有被執行完畢,甚至二進制日誌中也不要有匿名事務,能夠經過flush logs,並讓mysql來自動清理舊的二進制日誌文件。
 
 
step8:在每一個mysql實例上,設置GTID_MODE爲on,
 
[zejin] 3301>SET @@GLOBAL.GTID_MODE = ON;
Query OK, 0 rows affected (0.04 sec)
 
[zejin] 3302>SET @@GLOBAL.GTID_MODE = ON;
Query OK, 0 rows affected (0.04 sec)
 
step9:
 在每一個mysql實例的配置文件my.cnf上,增長 gtid-mode=ON
 
驗證
[zejin] 3301>insert into t_users values(3,'chen');
Query OK, 1 row affected (0.02 sec)
[zejin] 3301>update t_users set name='li' where id=1;
Query OK, 1 row affected (0.03 sec)
Rows matched: 1  Changed: 1  Warnings: 0
[zejin] 3301>select * from t_users;
+----+------+
| id | name |
+----+------+
|  1 | li   |
|  2 | zhou |
|  3 | chen |
+----+------+
3 rows in set (0.00 sec)
 
 
[zejin] 3302>show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.1.240
                  Master_User: repl
                  Master_Port: 3301
                Connect_Retry: 60
              Master_Log_File: binlog57.000006
          Read_Master_Log_Pos: 462
               Relay_Log_File: zejin240-relay-bin.000012
                Relay_Log_Pos: 673
        Relay_Master_Log_File: binlog57.000006
             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: 462
              Relay_Log_Space: 969
              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: 3301
                  Master_UUID: a97983fc-5a29-11e6-9d28-000c29d4dc3f
             Master_Info_File: /home/mysql/I3302/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: a97983fc-5a29-11e6-9d28-000c29d4dc3f:1-2 Executed_Gtid_Set: a97983fc-5a29-11e6-9d28-000c29d4dc3f:1-2
                Auto_Position: 0
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)
 
 
至此完成從傳統複製到GTID複製的在線轉換。
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