MGR 多主模式节点宕机重启

1，初始主节点宕机
当mysql服务进程还在:
执行如下命名
mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| group_replication_applier | efce3b94-e7ba-11e8-b99c-005056237187 | ndb01 | 3306 | ERROR |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
发现集群状态已经为ERROR
停止同步服务进程执行
stop group_replication;
mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| group_replication_applier | efce3b94-e7ba-11e8-b99c-005056237187 | ndb01 | 3306 | OFFLINE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
此时集群状态以为OFFLINE
开启同步进程
start group_replication;

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| group_replication_applier | 3eae0abc-e7bb-11e8-8a21-0050562e92c0 | ndb02 | 3306 | ONLINE |
| group_replication_applier | 46f558a2-e7bb-11e8-8ff9-0050563c8c87 | ndb03 | 3306 | ONLINE |
| group_replication_applier | efce3b94-e7ba-11e8-b99c-005056237187 | ndb01 | 3306 | ONLINE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
3 rows in set (0.00 sec)
当所有节点重启：
开始各个节点mysql服务
在各个节点执行
mysql> start group_replication;
^C^C -- query aborted
^C^C -- query aborted
^C^C -- query aborted
^C^C -- query aborted
^C^C -- query aborted
会卡主，日志报
[ERROR] Plugin group_replication reported: '[GCS] The member was unable to join the group. Local port: 33061'

这任意节点执行：
mysql> SET GLOBAL group_replication_bootstrap_group = ON;
Query OK, 0 rows affected (0.01 sec)

mysql> start group_replication;
Query OK, 0 rows affected (2.07 sec)

其余节点：
mysql> start group_replication;
Query OK, 0 rows affected (2.07 sec)

所有节点均已上线
2，初始从节点宕机
执行：
mysql> start group_replication;
Query OK, 0 rows affected (2.07 sec)
即可

总结：通过 SELECT * FROM performance_schema.replication_group_members;
查询结果为OFFLINE 可以直接开启服务
查询结果为ERROR 停止集群再开启
所有节点都宕机需要确定新的主节点引导集群
SET GLOBAL group_replication_bootstrap_group = ON;
各节点start group_replication; 即可

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MGR 多主模式节点宕机重启

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