Mariadb 10 GTID 複製 測試

同一機器上三個實例，3307爲maser，新造兩個mariadb實例，端口分別爲3309 和3310,開始搭建複製關係，版本爲mariadb 10.0.10

3307 導出： mysqldump --master-data=2
導入：
mysql -u -p --socket=/tmp/mysql3309.sock </apps/bak_3307.sql
mysql -u -p --socket=/tmp/mysql3310.sock </apps/bak_3307.sql

在作主從複製關係前，

dba@192.168.50.111(test_3309) : (none) 05:20:31>select @@global.gtid_current_pos;
@@global.gtid_current_pos
0-501113309-31329

1 row in set (0.02 sec)

dba@192.168.50.111(test_3309) : (none) 05:21:10>select @@global.gtid_current_pos;
@@global.gtid_current_pos
0-501113309-32311

1 row in set (0.00 sec)

dba@192.168.50.111(test_3309) : (none) 05:21:33>SELECT @@GLOBAL.gtid_slave_pos;
@@GLOBAL.gtid_slave_pos

1 row in set (0.00 sec)

能夠看出@@global.gtid_current_pos ，因爲數據不斷寫入，值是變的，而@@GLOBAL.gtid_slave_pos 因爲複製關係尚未搭建，目前是空值.

mysqldump備份文件裏面的change master備註：-- CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000052', MASTER_LOG_POS=394894368;

3309 端口採用原始的複製模式:

change master to master_host='192.168.50.111', MASTER_PORT=3307,master_user='', master_password='', master_log_file='mysql-bin.000052', master_log_pos=394894368;

start slave

dba@192.168.50.111(test_3309) : (none) 07:22:21>select @@global.gtid_current_pos;
@@global.gtid_current_pos
0-501113307-7227948

1 row in set (0.00 sec)

dba@192.168.50.111(test_3309) : (none) 07:22:48>SELECT @@GLOBAL.gtid_slave_pos;
@@GLOBAL.gtid_slave_pos
0-501113307-7227956

+-------------------------+ 能夠看到 @@GLOBAL.gtid_slave_pos 已經有值了,無論是否採用傳統或者gtid模式來複制.

3309 由傳統模式改成 gtid模式複製：

STOP SLAVE;
CHANGE MASTER TO master_host="192.168.50.111", master_port=3307, master_user='', master_password='', master_use_gtid=current_pos;
START SLAVE;

show slave status G 增長內容:

Master_Server_Id: 501113307
Master_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: Current_Pos
Gtid_IO_Pos: 0-501113307-7227969

3310 端口，直接採用GTID模式的複製，方法以下：

在主庫上（3307）執行 ： SELECT BINLOG_GTID_POS("mysql-bin.000052", 394894368);
BINLOG_GTID_POS("mysql-bin.000052", 394894368)
0-501113307-7227451	-- 獲得GTID位置

從庫上執行：
SET GLOBAL gtid_slave_pos = "0-501113307-7227451"; -- BINLOG_GTID_POS 函數獲得的位置
CHANGE MASTER TO master_host="192.168.50.111", master_port=3307, master_user='', master_password='', master_use_gtid=slave_pos;
START SLAVE;

show slave status G
Master_Server_Id: 501113307
Master_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: Slave_Pos
Gtid_IO_Pos: 0-501113307-7228013

切換master實驗，把3310端口的slave的master從 3307 端口，切換到3309端口

STOP SLAVE;
CHANGE MASTER TO master_host="192.168.50.111", master_port=3309
START SLAVE;

show slave status G
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.50.111
Master_User: rep
Master_Port: 3309
Master_Server_Id: 501113309
Master_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: Slave_Pos
Gtid_IO_Pos: 0-501113307-7280903 -- 雖然切換到3309 ，gtid的server-id，仍是3307的，501113307

再切回來，把對應的master指向3307端口

STOP SLAVE;
CHANGE MASTER TO master_host="192.168.50.111", master_port=3307
START SLAVE;

dba@192.168.50.111(test_3310) : (none) 03:29:42>show slave status G
1. row **

Slave_IO_State: Waiting for master to send event
              Master_Host: 192.168.50.111
              Master_User: rep
              Master_Port: 3307
            Connect_Retry: 60
          Master_Log_File: mysql-bin.000052       --變回3307 端口的了
      Read_Master_Log_Pos: 425706839
        Master_Server_Id:  501113307
           Master_SSL_Crl: 
       Master_SSL_Crlpath: 
               Using_Gtid: Slave_Pos
              Gtid_IO_Pos: 0-501113307-7281435     GTID的前兩段，不變,也就是全局惟一

三個全局變量：

select @@global.gtid_slave_pos, @@global.gtid_binlog_pos,@@global.gtid_current_pos;