wayuki opened a new issue, #22650: URL: https://github.com/apache/shardingsphere/issues/22650
## Bug Report **For English only**, other languages will not accept. Before report a bug, make sure you have: - Searched open and closed [GitHub issues](https://github.com/apache/shardingsphere/issues). - Read documentation: [ShardingSphere Doc](https://shardingsphere.apache.org/document/current/en/overview). Please pay attention on issues you submitted, because we maybe need more details. If no response anymore and we cannot reproduce it on current information, we will **close it**. Please answer these questions before submitting your issue. Thanks! ### Which version of ShardingSphere did you use? 5.2.1 ### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy? Proxy ### Expected behavior ds_a: mysql> SHOW SLAVE HOSTS; +-----------+------+------+-----------+--------------------------------------+ | Server_id | Host | Port | Master_id | Slave_UUID | +-----------+------+------+-----------+--------------------------------------+ | 168178 | | 3306 | 9728 | 6b637151-72ba-11ed-a450-02001715f769 | | 8764 | | 3306 | 9728 | 6e903de2-72ba-11ed-a450-02001714e0dd | +-----------+------+------+-----------+--------------------------------------+ 2 rows in set (0.00 sec) mysql> SHOW VARIABLES LIKE 'read_only'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | read_only | OFF | +---------------+-------+ 1 row in set (0.00 sec) ds_b and ds_c: mysql> SHOW SLAVE HOSTS; Empty set (0.00 sec) mysql> SHOW VARIABLES LIKE 'read_only'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | read_only | ON | +---------------+-------+ 1 row in set (0.00 sec) mysql> CREATE DB_DISCOVERY RULE db_discovery_group_0 ( -> RESOURCES(ds_a, ds_b, ds_c), -> TYPE(NAME='MySQL.NORMAL_REPLICATION'), -> HEARTBEAT(PROPERTIES('keep-alive-cron'='0/5 * * * * ?')) -> ); ERROR 30000 (HY000): Unknown exception: Cannot parse null string ### Actual behavior ERROR 30000 (HY000): Unknown exception: Cannot parse null string ### Reason analyze (If you can) ### Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc. ### Example codes for reproduce this issue (such as a github link). -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
