Strange behavior of replication hostgroups.

[PavelVD]

Hello. I have initial config with 2 servers

+--------------+--------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| hostgroup_id | hostname     | port | gtid_port | status | weight | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment |
+--------------+--------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| 1            | XXXX.1       | 3307 | 0         | ONLINE | 1      | 0           | 1000            | 10                  | 0       | 0              |         |
| 1            | XXXX.2       | 3307 | 0         | ONLINE | 1      | 0           | 1000            | 10                  | 0       | 0              |         |
+--------------+--------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+

select * from runtime_mysql_replication_hostgroups; +------------------+------------------+------------+---------+ | writer_hostgroup | reader_hostgroup | check_type | comment | +------------------+------------------+------------+---------+ | 1 | 2 | read_only | | +------------------+------------------+------------+---------+

On server  XXXX.2  i have read_only  and now i see in runtime table

select * from runtime_mysql_servers;
+--------------+--------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| hostgroup_id | hostname     | port | gtid_port | status | weight | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment |
+--------------+--------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| 1            | XXXX.1       | 3307 | 0         | ONLINE | 1      | 0           | 1000            | 10                  | 0       | 0              |         |
| 2            | XXXX.1       | 3307 | 0         | ONLINE | 1      | 0           | 1000            | 10                  | 0       | 0              |         |
| 2            | XXXX.2       | 3307 | 0         | ONLINE | 1      | 0           | 1000            | 10                  | 0       | 0              |         |
+--------------+--------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+

But after restart proxysql service i see only 2 records in runtime

select * from runtime_mysql_servers;
+--------------+--------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| hostgroup_id | hostname     | port | gtid_port | status | weight | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment |
+--------------+--------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| 1            | XXXX.1       | 3307 | 0         | ONLINE | 1      | 0           | 1000            | 10                  | 0       | 0              |         |
| 2            | XXXX.2       | 3307 | 0         | ONLINE | 1      | 0           | 1000            | 10                  | 0       | 0              |         |
+--------------+--------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+

And it do not change in time.

But if i set read_only on server XXXX.1  for some seconds and remove it back - i see 3 servers in runtime again. And it do not change till next restart.