zhaojinchao95 opened a new issue, #25576:
URL: https://github.com/apache/shardingsphere/issues/25576
Hi community,
Currently, ShardingSphere' s curator usage has event blocking risk. because
[ZooKeeper watches are single
threaded](https://cwiki.apache.org/confluence/display/CURATOR/TN1), So we can't
use curator thread to do something. For example, load database metadata or
persist data to governance center.
Reproduce Steps:
```
1. CREATE DATABASE sharding_db;
2. USE sharding_db;
3. REGISTER STORAGE UNIT ds_0 (
URL="jdbc:mysql://127.0.0.1:3306/yy?serverTimezone=UTC&allowPublicKeyRetrieval=true&useSSL=false&useServerPrepStmts=true&cachePrepStmts=true&prepStmtCacheSize=8192&prepStmtCacheSqlLimit=8000",
USER="root",
PASSWORD="root",
PROPERTIES("maximumPoolSize"=20,"minimumIdle"=1,"idleTimeout"="30000")
);
The ds_0 data source has 1k+ tables.
4. SET DIST VARIABLE sql_show = true; // sql_show is always false and need
to a long time to update.
5. SHOW DIST VARIABLES;
```
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