uioprty opened a new issue, #17464: URL: https://github.com/apache/dolphinscheduler/issues/17464
### Search before asking - [x] I had searched in the [issues](https://github.com/apache/dolphinscheduler/issues?q=is%3Aissue) and found no similar issues. ### What happened When a worker receives an SQL task for the first time, it loads the driver class. If there are many tasks of multiple datasource types concurrently for the first time, a deadlock may occur, causing the thread to hang. see: https://medium.com/@priyaaggarwal24/avoiding-deadlock-when-using-multiple-jdbc-drivers-in-an-application-ce0b9464ecdf ### What you expected to happen Workers run normally. ### How to reproduce A number of SQL task instances from different data source types were already queued up and awaiting execution before the Worker started. Here is a demo. ``` public class DeadLockTest { public static void main(String[] args) throws InterruptedException { ExecutorService es = Executors.newFixedThreadPool(2); es.execute(() -> { try { Class.forName("com.mysql.cj.jdbc.Driver"); } catch (ClassNotFoundException e) { throw new RuntimeException(e); } }); es.execute(() -> { try { Class.forName("com.clickhouse.jdbc.ClickHouseDriver"); } catch (ClassNotFoundException e) { throw new RuntimeException(e); } }); es.shutdown(); while (!es.isTerminated()) { Thread.sleep(500); System.out.println("waiting"); } System.out.println("end"); } } ``` openjdk version: 1.8.0_412 jstack result： <img width="1132" height="610" alt="Image" src="https://github.com/user-attachments/assets/fc860bd2-5bf0-4721-b196-e8febd146025"; /> ### Anything else suggestion: remove Class.forName while getting connection. ### Version 3.2.x ### Are you willing to submit PR? - [ ] Yes I am willing to submit a PR! ### Code of Conduct - [x] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) -- 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]
