PXC中的GTIDs - 爱码网

基本环境：PXC 5.7.19 Row+Gtid，3节点

一、Galera GTID vs MySQL GTID

1.1、Galera GTID vs MySQL GTID

Both kinds of GTIDs are using the same format: <source_id:trx_number>.
For Galera, <source_id> is generated when the cluster is bootstrapped. This <source_id> is shared by all nodes.
For MySQL, <source_id> is the server uuid. So it is easy to identify from which server a transaction originates.

我们先来看下PXC环境Galera GTID和MySQL GTID分别指的是什么

# node1的server_uuid
mydba@192.168.85.132,3326 [replcrash]> select @@server_uuid;
+--------------------------------------+
| @@server_uuid                        |
+--------------------------------------+
| 31304898-67d8-11e8-bb20-000c29c1025c |
+--------------------------------------+
1 row in set (0.00 sec)
# node1写入一条数据
mydba@192.168.85.132,3326 [replcrash]> insert into py_user(name,add_time,server_id) select left(uuid(),32),now(),@@server_id;
Query OK, 1 row affected (0.02 sec)
Records: 1  Duplicates: 0  Warnings: 0
# node1查看gtid_executed
mydba@192.168.85.132,3326 [replcrash]> select @@global.gtid_executed;
+----------------------------------------+
| @@global.gtid_executed                 |
+----------------------------------------+
| 0f0f1664-9769-ee17-7834-ec71884d9f25:1 |
+----------------------------------------+
1 row in set (0.00 sec)

# node2的server_uuid
mydba@192.168.85.133,3326 [replcrash]> select @@server_uuid;
+--------------------------------------+
| @@server_uuid                        |
+--------------------------------------+
| 570e2242-6898-11e8-bcae-000c2900c99c |
+--------------------------------------+
1 row in set (0.01 sec)
# node2写入一条数据
mydba@192.168.85.133,3326 [replcrash]> insert into py_user(name,add_time,server_id) select left(uuid(),32),now(),@@server_id;
Query OK, 1 row affected (0.45 sec)
Records: 1  Duplicates: 0  Warnings: 0
# node2查看gtid_executed
mydba@192.168.85.133,3326 [replcrash]> select @@global.gtid_executed;
+------------------------------------------+
| @@global.gtid_executed                   |
+------------------------------------------+
| 0f0f1664-9769-ee17-7834-ec71884d9f25:1-2 |
+------------------------------------------+
1 row in set (0.00 sec)

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