MySQL Group ReplicationでPrimaryのHOSTがどれかを確認する方法

以下の通り

mysql> SELECT b.MEMBER_HOST, b.MEMBER_PORT FROM performance_schema.global_status as a, performance_schema.replication_group_members as b where a.VARIABLE_NAME= 'group_replication_primary_member' and a.VARIABLE_VALUE = b.MEMBER_ID;
+-------------+-------------+
| MEMBER_HOST | MEMBER_PORT |
+-------------+-------------+
| mysql-2     |        3306 |
+-------------+-------------+
1 row in set (0.00 sec)

次の２つのテーブルを結合しているだけです

mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| group_replication_applier | 3aa373dc-12bb-11e7-b4f9-00155d041428 | mysql-3     |        3306 | ONLINE       |
| group_replication_applier | 5fc11a47-055e-11e7-9b1a-00155d041426 | mysql-1     |        3306 | ONLINE       |
| group_replication_applier | cfe5952c-055f-11e7-a7f4-00155d041427 | mysql-2     |        3306 | ONLINE       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
3 rows in set (0.00 sec)

mysql> SELECT * from performance_schema.global_status WHERE VARIABLE_NAME= 'group_replication_primary_member';
+----------------------------------+--------------------------------------+
| VARIABLE_NAME                    | VARIABLE_VALUE                       |
+----------------------------------+--------------------------------------+
| group_replication_primary_member | cfe5952c-055f-11e7-a7f4-00155d041427 |
+----------------------------------+--------------------------------------+
1 row in set (0.00 sec)