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步原集群数据。
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reset master;
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set global gtid_purge = '2c7b4762-5963-5789-acdd-047677b98a9d:1-32876403:33576383-33576398'
-- 设置MGR相关参数
set global binlog_checksum = NONE;
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set global group_replication_group_name = '2c7b4762-5963-5789-acdd-047677b98a9d';
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set global group_replication_local_address = '192.168.4.35:23816';
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set global group_replication_group_seeds = "192.168.4.35:23309";
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set global group_replication_bootstrap_group = off;
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set global group_replication_single_primary_mode = 0;
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set global group_replication_enforce_update_everywhere_checks = 0;
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set global group_replication_unreachable_majority_timeout = 120;
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set global group_replication_enforce_update_everywhere_checks = 1;
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-- 启动集群
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start group_replication
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-- 尝试执行UDF：group_replication_get_communication_protocol：
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SELECT group_replication_get_communication_protocol();
+------------------------------------------------+
| group_replication_get_communication_protocol() |
+------------------------------------------------+
| 5.7.14 |
+------------------------------------------------+
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-- MySQL 8.0.16 加入由全部节点均为5.7.25版本，自动将通讯协议降成了5.7.14，以便相互通讯兼容。
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-- 同时也说明 MySQL的通信协议版本可能和MySQL实例版本有可能不是一致的哦（这点还需要论证下，不敢打包票）
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-- 注意：如果出现以下错误，原因是执行UDF，必须要在集群成员均为Online对的状态下才可执行
-- ERROR 1123 (HY000): Can't initialize function 'group_replication_get_communication_protocol'; A member is joining the group, wait for it to be ONLINE.'
-- 查看集群节点状态：
[performance_schema]> select * from replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
| group_replication_applier | 6990a8f4-777c-11e9-a906-20040fecc760 | node004035 | 3816 | ONLINE | SECONDARY | 8.0.16 |
| group_replication_applier | cc11c7de-446a-11e9-ae80-20040fecc760 | node004035 | 3309 | ONLINE | SECONDARY | 5.7.25 |
| group_replication_applier | cc830e26-446a-11e9-be34-20040fed73f8 | node004036 | 3309 | ONLINE | SECONDARY | 5.7.25 |
| group_replication_applier | cc88974a-446a-11e9-9e99-20040fed8fd8 | node004034 | 3309 | ONLINE | PRIMARY | 5.7.25 |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
搭建完成，均手工测试，数据可正常同步及读取。测试数据就不在这里介绍，可自行玩耍。
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