mysql的mgr集群的网络不可达之后脑裂的问题

news2025/11/4 17:52:52

此时主节点上的dml和ddl操作都会挂死，由于脑裂问题，无法判断谁是主谁是备，所以节点无法写操作。

此时需要手动介入处理：


mysql> show variables like '%group_replication_member_expel_timeout%';
+----------------------------------------+-------+
| Variable_name                          | Value |
+----------------------------------------+-------+
| group_replication_member_expel_timeout | 30    |
+----------------------------------------+-------+
1 row in set (0.01 sec)

mysql> show variables like '%group_replication_unreachable_majority_timeout%';
+------------------------------------------------+-------+
| Variable_name                                  | Value |
+------------------------------------------------+-------+
| group_replication_unreachable_majority_timeout | 0     |
+------------------------------------------------+-------+
1 row in set (0.00 sec)

mysql> set GLOBAL group_replication_unreachable_majority_timeout=35;
Query OK, 0 rows affected (0.00 sec)

mysql> show variables like '%group_replication_unreachable_majority_timeout%';
+------------------------------------------------+-------+
| Variable_name                                  | Value |
+------------------------------------------------+-------+
| group_replication_unreachable_majority_timeout | 35    |
+------------------------------------------------+-------+
1 row in set (0.01 sec)


mysql> SELECT @@group_replication_local_address;
+-----------------------------------+
| @@group_replication_local_address |
+-----------------------------------+
| 10.1.1.51:33071                   |
+-----------------------------------+
1 row in set (0.00 sec)

mysql> SET GLOBAL group_replication_force_members="10.1.1.51:33071";


ERROR 4118 (HY000): The 'SET GLOBAL group_replication_force_members=10.1.1.51:33071' command encountered a failure. Timeout on wait for view after setting group_replication_force_members.
mysql> 
mysql> 
mysql> show variables like '%group_replication_force_members%';
+---------------------------------+-------+
| Variable_name                   | Value |
+---------------------------------+-------+
| group_replication_force_members |       |
+---------------------------------+-------+
1 row in set (0.01 sec)

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 773123a4-daad-11ee-930b-3009f923fbf1 | 10.1.1.51   |        3307 | ONLINE       | PRIMARY     | 8.0.36         | XCom                       |
| group_replication_applier | b2b77622-daad-11ee-a732-3009f925119f | 10.1.1.52   |        3307 | UNREACHABLE  | SECONDARY   | 8.0.36         | XCom                       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
2 rows in set (0.00 sec)

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 773123a4-daad-11ee-930b-3009f923fbf1 | 10.1.1.51   |        3307 | ONLINE       | PRIMARY     | 8.0.36         | XCom                       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
1 row in set (0.00 sec)

mysql> show variables like '%group_replication_force_members%';
+---------------------------------+-------+
| Variable_name                   | Value |
+---------------------------------+-------+
| group_replication_force_members |       |
+---------------------------------+-------+
1 row in set (0.01 sec)

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 773123a4-daad-11ee-930b-3009f923fbf1 | 10.1.1.51   |        3307 | ONLINE       | PRIMARY     | 8.0.36         | XCom                       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
1 row in set (0.00 sec)

mysql>  show variables like '%group_replication_force_members%';
+---------------------------------+-------+
| Variable_name                   | Value |
+---------------------------------+-------+
| group_replication_force_members |       |
+---------------------------------+-------+
1 row in set (0.00 sec)

mysql> show processlist;
+--------+-----------------+---------------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
| Id     | User            | Host                | db      | Command | Time    | State                                                    | Info                             |
+--------+-----------------+---------------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
|      7 | event_scheduler | localhost           | NULL    | Daemon  |   44294 | Waiting for next activation                              | NULL                             |
|     15 | system user     |                     | NULL    | Connect | 1452183 | waiting for handler commit                               | Group replication applier module |
|     17 | system user     |                     | NULL    | Query   | 1452178 | Replica has read all relay log; waiting for more updates | NULL                             |
|     18 | system user     |                     | NULL    | Connect | 1452183 | Waiting for an event from Coordinator                    | NULL                             |
|     19 | system user     |                     | NULL    | Connect | 1452183 | Waiting for an event from Coordinator                    | NULL                             |
|     20 | system user     |                     | NULL    | Connect | 1452183 | Waiting for an event from Coordinator                    | NULL                             |
|     21 | system user     |                     | NULL    | Connect | 1452183 | Waiting for an event from Coordinator                    | NULL                             |
| 483710 | root            | 112.74.19.133:33882 | prebill | Sleep   |    1469 |                                                          | NULL                             |
| 483860 | root            | 112.74.19.133:33934 | prebill | Sleep   |    1040 |                                                          | NULL                             |
| 483925 | root            | 10.1.1.51:57846     | prebill | Query   |       0 | init                                                     | show processlist                 |
+--------+-----------------+---------------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
10 rows in set, 1 warning (0.00 sec)

mysql> kill 483710
    -> ;
Query OK, 0 rows affected (0.00 sec)

mysql> show processlist;
+--------+-----------------+---------------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
| Id     | User            | Host                | db      | Command | Time    | State                                                    | Info                             |
+--------+-----------------+---------------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
|      7 | event_scheduler | localhost           | NULL    | Daemon  |   44417 | Waiting for next activation                              | NULL                             |
|     15 | system user     |                     | NULL    | Connect | 1452306 | waiting for handler commit                               | Group replication applier module |
|     17 | system user     |                     | NULL    | Query   | 1452301 | Replica has read all relay log; waiting for more updates | NULL                             |
|     18 | system user     |                     | NULL    | Connect | 1452306 | Waiting for an event from Coordinator                    | NULL                             |
|     19 | system user     |                     | NULL    | Connect | 1452306 | Waiting for an event from Coordinator                    | NULL                             |
|     20 | system user     |                     | NULL    | Connect | 1452306 | Waiting for an event from Coordinator                    | NULL                             |
|     21 | system user     |                     | NULL    | Connect | 1452306 | Waiting for an event from Coordinator                    | NULL                             |
| 483860 | root            | 112.74.19.133:33934 | prebill | Sleep   |    1163 |                                                          | NULL                             |
| 483925 | root            | 10.1.1.51:57846     | prebill | Query   |       0 | init                                                     | show processlist                 |
+--------+-----------------+---------------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
9 rows in set, 1 warning (0.00 sec)

mysql> kill 483860;
Query OK, 0 rows affected (0.00 sec)

mysql> show processlist;
+--------+-----------------+-----------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
| Id     | User            | Host            | db      | Command | Time    | State                                                    | Info                             |
+--------+-----------------+-----------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
|      7 | event_scheduler | localhost       | NULL    | Daemon  |   44426 | Waiting for next activation                              | NULL                             |
|     15 | system user     |                 | NULL    | Connect | 1452315 | waiting for handler commit                               | Group replication applier module |
|     17 | system user     |                 | NULL    | Query   | 1452310 | Replica has read all relay log; waiting for more updates | NULL                             |
|     18 | system user     |                 | NULL    | Connect | 1452315 | Waiting for an event from Coordinator                    | NULL                             |
|     19 | system user     |                 | NULL    | Connect | 1452315 | Waiting for an event from Coordinator                    | NULL                             |
|     20 | system user     |                 | NULL    | Connect | 1452315 | Waiting for an event from Coordinator                    | NULL                             |
|     21 | system user     |                 | NULL    | Connect | 1452315 | Waiting for an event from Coordinator                    | NULL                             |
| 483925 | root            | 10.1.1.51:57846 | prebill | Query   |       0 | init                                                     | show processlist                 |
+--------+-----------------+-----------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
8 rows in set, 1 warning (0.00 sec)

mysql> show processlist;
+--------+-----------------+-----------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
| Id     | User            | Host            | db      | Command | Time    | State                                                    | Info                             |
+--------+-----------------+-----------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
|      7 | event_scheduler | localhost       | NULL    | Daemon  |   44513 | Waiting for next activation                              | NULL                             |
|     15 | system user     |                 | NULL    | Connect | 1452402 | waiting for handler commit                               | Group replication applier module |
|     17 | system user     |                 | NULL    | Query   | 1452397 | Replica has read all relay log; waiting for more updates | NULL                             |
|     18 | system user     |                 | NULL    | Connect | 1452402 | Waiting for an event from Coordinator                    | NULL                             |
|     19 | system user     |                 | NULL    | Connect | 1452402 | Waiting for an event from Coordinator                    | NULL                             |
|     20 | system user     |                 | NULL    | Connect | 1452402 | Waiting for an event from Coordinator                    | NULL                             |
|     21 | system user     |                 | NULL    | Connect | 1452402 | Waiting for an event from Coordinator                    | NULL                             |
| 483925 | root            | 10.1.1.51:57846 | prebill | Query   |       0 | init                                                     | show processlist                 |
+--------+-----------------+-----------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
8 rows in set, 1 warning (0.00 sec)

mysql> show processlist;
+--------+-----------------+-----------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
| Id     | User            | Host            | db      | Command | Time    | State                                                    | Info                             |
+--------+-----------------+-----------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
|      7 | event_scheduler | localhost       | NULL    | Daemon  |   44516 | Waiting for next activation                              | NULL                             |
|     15 | system user     |                 | NULL    | Connect | 1452405 | waiting for handler commit                               | Group replication applier module |
|     17 | system user     |                 | NULL    | Query   | 1452400 | Replica has read all relay log; waiting for more updates | NULL                             |
|     18 | system user     |                 | NULL    | Connect | 1452405 | Waiting for an event from Coordinator                    | NULL                             |
|     19 | system user     |                 | NULL    | Connect | 1452405 | Waiting for an event from Coordinator                    | NULL                             |
|     20 | system user     |                 | NULL    | Connect | 1452405 | Waiting for an event from Coordinator                    | NULL                             |
|     21 | system user     |                 | NULL    | Connect | 1452405 | Waiting for an event from Coordinator                    | NULL                             |
| 483925 | root            | 10.1.1.51:57846 | prebill | Query   |       0 | init                                                     | show processlist                 |
+--------+-----------------+-----------------+---------+---------+---------+----------------------------------------------------------+----------------------------------+
8 rows in set, 1 warning (0.00 sec)

mysql>  show variables like '%group_replication_force_members%';
+---------------------------------+-------+
| Variable_name                   | Value |
+---------------------------------+-------+
| group_replication_force_members |       |
+---------------------------------+-------+
1 row in set (0.01 sec)

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 773123a4-daad-11ee-930b-3009f923fbf1 | 10.1.1.51   |        3307 | ONLINE       | PRIMARY     | 8.0.36         | XCom                       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
1 row in set (0.00 sec)

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 773123a4-daad-11ee-930b-3009f923fbf1 | 10.1.1.51   |        3307 | ONLINE       | PRIMARY     | 8.0.36         | XCom                       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
1 row in set (0.00 sec)

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 773123a4-daad-11ee-930b-3009f923fbf1 | 10.1.1.51   |        3307 | ONLINE       | PRIMARY     | 8.0.36         | XCom                       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
1 row in set (0.00 sec)

相关参考：

MGR网络抖动问题分析和group_replication_unreachable_majority_timeout等参数分析_group_replication_member_expel_timeout-CSDN博客
 https://www.51cto.com/article/718981.html

MySQL之MGR成员故障导致整个集群不可用的问题排查分析 - 简书

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Windows10及以上系统对于安全的考虑，对于程序运行时的权限做了控制 点击后，会弹出确认的弹窗。 像我做测试，或者使用cmd经常需要administrator 权限，一直弹弹弹就很烦。 要实现右击后无需弹窗就可以使用管理员权限运行改…
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