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Mysql入門MySQL5.7不停業務將傳統復制變更為GTID復制的實例

作者：VEPHP   時間 2017-09-27

《Mysql入門MySQL5.7不停業務將傳統復制變更為GTID復制的實例》要點：
本文介紹了Mysql入門MySQL5.7不停業務將傳統復制變更為GTID復制的實例，希望對您有用。如果有疑問，可以聯系我們。

由于GTID的優勢,我們需要將傳統基于file-pos的復制更改為基于GTID的復制,如何在線變更成為我們關心的一個點,如下為具體的方法：MYSQL學習

目前我們有一個傳統復制下的M-S結構：MYSQL學習

port 3301 masterMYSQL學習

port 3302 slaveMYSQL學習

master上(3301)：
[zejin] 3301>select * from t_users;
+----+------+
| id | name |
+----+------+
| 1 | hao |
| 2 | zhou |
+----+------+
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:
row in set (0.00 sec)
 
[zejin] 3302>select * from t_users;
+----+------+
| id | name |
+----+------+
| 1 | hao |
| 2 | zhou |
+----+------+
rows in set (0.00 sec)

如下為在線變更的具體的操作步驟：MYSQL學習

前提：MYSQL學習

1.要求所有的mysql版本5.7.6或更高的版本.
MYSQL學習

2.目前拓撲結構中所有的mysql的gtid_mode的值為off狀態.
MYSQL學習

3.如下的操作步驟都是有序的,不要跳躍著進行.
MYSQL學習

補充一下全局系統變量GTID_MODE變量值說明：???MYSQL學習

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MYSQL學習

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MYSQL學習

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MYSQL學習

ON?? 新事務是GTID,? Slave只接受帶GTID的事務MYSQL學習

需要注意的是,這幾個值的改變是有順序的,即MYSQL學習

off<--->OFF_PERMISSIVE<--->ON_PERMISSIVE<--->ONMYSQL學習

不能跳躍執行,會報錯.MYSQL學習

step1:在每個mysql實例上,將ENFORCE_GTID_CONSISTENCY設置為warning,哪臺先執行不影響結果.MYSQL學習

[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：執行完這條語句后,如果出現GTID不兼容的語句用法,在錯誤日志會記錄相關信息,那么需要調整應該程序避免不兼容的寫法,直到完全沒有產生不兼容的語句,可以通過應該程序去排查所有的sql,也可以設置后觀察錯誤日志一段時間,這一步非常重要. MYSQL學習

step2：在每個mysql實例上,設置ENFORCE_GTID_CONSISTENCY為ON,哪臺先執行不影響結果MYSQL學習

在第一步完成后,就可以將值設置為on.MYSQL學習

[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:在每個mysql實例上,設置GTID_MODE為off_permissiv;哪臺先執行不影響結果MYSQL學習

[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:在每個mysql實例上,設置GTID_MODE為on_permissiv;;哪臺先執行不影響結果MYSQL學習

[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:在每個mysql實例上檢查變量ONGOING_ANONYMOUS_TRANSACTION_COUNTMYSQL學習

[zejin] 3301>SHOW STATUS LIKE 'ONGOING_ANONYMOUS_TRANSACTION_COUNT';
+-------------------------------------+-------+
| Variable_name      | Value |
+-------------------------------------+-------+
| Ongoing_anonymous_transaction_count | 0  |
+-------------------------------------+-------+
row in set (0.02 sec)
 
 
[zejin] 3302>SHOW STATUS LIKE 'ONGOING_ANONYMOUS_TRANSACTION_COUNT';
+-------------------------------------+-------+
| Variable_name      | Value |
+-------------------------------------+-------+
| Ongoing_anonymous_transaction_count | 0  |
+-------------------------------------+-------+
row in set (0.02 sec)

需要等到此變量為0MYSQL學習

step6: 確保所有的匿名事務(非GTID事務)已經被完全復制到所有的server上.MYSQL學習

檢查方法：MYSQL學習

在master上：
[zejin] 3301>show master status;
+-----------------+----------+--------------+------------------+-------------------+
| File   | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-----------------+----------+--------------+------------------+-------------------+
| binlog57.000005 |  154 |    |     |     |
+-----------------+----------+--------------+------------------+-------------------+
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的值大于binlog57.000005,MYSQL學習

或者等于Relay_Master_Log_File等于binlog57.000005并且Exec_Master_Log_Pos的值大于等于154即可?MYSQL學習

或者slave直接用函數：MYSQL學習

[zejin] 3302>SELECT MASTER_POS_WAIT('binlog57.000005', 154);
+-----------------------------------------+
| MASTER_POS_WAIT('binlog57.000005', 154) |
+-----------------------------------------+
|          0 |
+-----------------------------------------+
row in set (0.00 sec)

返回結果大于等于0就說明匿名事務已經全部復制完成?MYSQL學習

step7: 確認整個拓撲結構中已經沒有匿名事務的存在,如之前產生的所有匿名事務已經全部被執行完畢,甚至二進制日志中也不要有匿名事務,可以通過flush logs,并讓mysql來自動清理舊的二進制日志文件.?MYSQL學習

step8: 在每個mysql實例上,設置GTID_MODE為on,MYSQL學習

[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: 在每個mysql實例的配置文件my.cnf上,增加gtid-mode=ONMYSQL學習

驗證：MYSQL學習

[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 |
+----+------+
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: 
row in set (0.00 sec)

至此完成從傳統復制到GTID復制的在線轉換.MYSQL學習

以上這篇MySQL5.7不停業務將傳統復制變更為GTID復制的實例就是小編分享給大家的全部內容了,希望能給大家一個參考,也希望大家多多支持維易PHP.MYSQL學習

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