MySQL学习笔记16分组复制的几个常见问题以及解决办法

(1)分组复制的限制。

(a)存储引擎只能是InnoDB。

(b)二进制日志格式只支持ROW格式。

(c)只支持使用GTID模式。

(d)每个分组最多只支持9个成员节点。

(2)数据表必须有主键。

mysql> create table test (name varchar(100));

Query OK, 0 rows affected (0.05 sec)

mysql> insert into test values( now()),(now());

ERROR 3098 (HY000): The table does not comply with the requirements by an external plugin.

查看日志：

2017-08-19T06:23:22.253181Z 13 [ERROR] Plugin group_replication reported: ‘Table test does not have any PRIMARY KEY. This is not compatible with Group Replication‘

2017-08-19T06:24:18.493848Z 13 [ERROR] Plugin group_replication reported: ‘Table test does not have any PRIMARY KEY. This is not compatible with Group Replication‘

解决办法：

创建有主键的数据表。

mysql> create table test ( name varchar(100) primary key);

Query OK, 0 rows affected (0.02 sec)

mysql> insert into test (name) values (‘001‘);

Query OK, 1 row affected (0.02 sec)

mysql> insert into test (name) values (‘002‘);

Query OK, 1 row affected (0.01 sec)

mysql> insert into test (name) values (‘003‘);

Query OK, 1 row affected (0.00 sec)

mysql> insert into test (name) values (now());

Query OK, 1 row affected (0.01 sec)

(3)数据库已经存在。

日志中出现了数据库已经存在而无法创建数据库的错误。

2017-08-19T06:51:50.784471Z 28 [ERROR] Slave SQL for channel ‘group_replication_recovery‘: Error ‘Can‘t create database ‘test‘; database exists‘ on query. Default database: ‘test‘. Query: ‘create database test‘, Error_code: 1007

2017-08-19T06:51:50.784523Z 28 [Warning] Slave: Can‘t create database ‘test‘; database exists Error_code: 1007

2017-08-19T06:51:50.784530Z 28 [ERROR] Error running query, slave SQL thread aborted. Fix the problem, and restart the slave SQL thread with "SLAVE START". We stopped at log ‘binlog.000001‘ position 1082

解决办法：

mysql> stop group_replication;

Query OK, 0 rows affected (9.43 sec)

mysql> drop database test;

ERROR 1290 (HY000): The MySQL server is running with the --super-read-only option so it cannot execute this statement

mysql> set global super_read_only=0;

Query OK, 0 rows affected (0.00 sec)

mysql> drop database test;

Query OK, 0 rows affected (0.00 sec)

mysql> set global super_read_only=1;

Query OK, 0 rows affected (0.00 sec)

mysql> set global group_replication_allow_local_disjoint_gtids_join=ON;

Query OK, 0 rows affected (0.00 sec)

mysql> start group_replication;

Query OK, 0 rows affected (3.19 sec)

为了防止在MySQL的节点在启动时出现此问题，可将下面的配置加入MySQL配置文件。

loose-group_replication_allow_local_disjoint_gtids_join=on

MySQL学习笔记16分组复制的几个常见问题以及解决办法

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